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Queens University
1.
van Geffen, Pim Wilhelmus Gerardus.
Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
.
Degree: Geological Sciences and Geological Engineering, 2011, Queens University
URL: http://hdl.handle.net/1974/6515 
► The Paleoproterozoic Talbot volcanogenic massive sulphide (VMS) Cu-Zn occurrence is located near Talbot Lake, Manitoba, about 80 km south of Snow Lake. The mineralised system…
(more)
▼ The Paleoproterozoic Talbot volcanogenic massive sulphide (VMS) Cu-Zn occurrence is located near Talbot Lake, Manitoba, about 80 km south of Snow Lake. The mineralised system is unconformably overlain by more than 100 m of Paleozoic dolomite sequences and Quaternary glacial till. The clay fraction of the till contains pronounced anomalies of Zn, Cu, Ag, Pb, Au, Mn, Hg, Cd, Co, Bi and Se, which is ascribed to the formation of clay-humic complexes that have carbon-isotopic compositions of δ13C < -20‰. A VMS origin of the near-surface anomaly is confirmed by distinctly low 206Pb/204Pb ratios, compared to a more radiogenic till signature.
The overall low 206Pb/204Pb ratios in the organic surface media black spruce bark, moss and humus also indicate input from a magmatic sulphide source, but likely reflect windblown material from the Flin Flon smelter stack at 160 km to the northwest. Black spruce tree rings that pre-date industrial sources of atmospheric metal input are used to measure historical element distributions because they record the local geochemistry at the time of heartwood growth and their root systems tap into large volumes of soil. At the Talbot prospect, the presence of secondary Zn from the till in black spruce tree cores is reflected in the Zn/Ca ratio, which eliminates the effect of dolomite-derived Zn. The process of element migration from buried mineralisation to the surface
is complex and includes oxidation of sulphides, mobilisation and complexation of metal ions, physical upward transport, and deposition of indicator elements near the surface in accessible sampling media. To account for a significant influx of indicator elements into the relatively recently deposited till blanket, post-glacial groundwater upwelling is proposed to act as a major mechanism driving upward element migration.
Subjects/Keywords: Geochemistry
;
Mineral Exploration
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APA (6th Edition):
van Geffen, P. W. G. (2011). Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6515
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
van Geffen, Pim Wilhelmus Gerardus. “Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
.” 2011. Thesis, Queens University. Accessed March 05, 2021.
http://hdl.handle.net/1974/6515.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
van Geffen, Pim Wilhelmus Gerardus. “Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
.” 2011. Web. 05 Mar 2021.
Vancouver:
van Geffen PWG. Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
. [Internet] [Thesis]. Queens University; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1974/6515.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
van Geffen PWG. Geochemical Indicators of Buried Sulphide Mineralisation Under Sedimentary Cover Near Talbot Lake, Manitoba
. [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6515
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Mavri?, Danijela.
Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration.
Degree: School of Natural Sciences. Discipline of Geology, 2019, Trinity College Dublin
URL: http://hdl.handle.net/2262/88768
► The trace-element geochemistry of native and common plant species in Ireland including ash, beech, blackberry, hawthorn, oak, poplar and sycamore was systematically determined above the…
(more)
▼ The trace-element geochemistry of native and common plant species in Ireland including ash, beech, blackberry, hawthorn, oak, poplar and sycamore was systematically determined above the Navan Zn-Pb deposit, currently mined by Boliden Tara Mines Limited. The study area represents a sub-outcropping carbonate-hosted base metal orebody characterised by a large shallow soil Zn-Pb anomaly.
The new results show that Zn contents in leaf materials across all species vary from 22 ppm to 735 ppm (dry weight) above the orebody while control sites concentrations ranged from 15 ppm to 263 ppm. The highest concentrations of Zn are observed in poplar trees (735 ppm) growing above the sub-cropping mineralisation. Levels of Pb are anomalously high (3.8 ppm, on average) in all investigated tree species compared to the background values from control sites (0.54 ppm, on average). Soil geochemistry determined above the deposit exhibited 1111 ppm of Zn and 390 ppm of Pb, on average. In order to better understand the source pathway of metal anomalies, stable metal isotopes were measured in plants, soil and tree cores to investigate typical ranges of Zn and Cu isotopes above the Navan deposit. The Zn isotope composition of hawthorn growing over unmineralised bedrock exhibits enrichment in heavy isotopes (δ66ZnJMC of 0.15 to 0.48 ). In contrast, much lighter Zn isotopes (δ66ZnJMC of -0.12 to -0.62 ) were detected in the same plant species above the Navan orebody (Nevinstown Zone). In addition, the Nevinstown area exhibits lighter Cu isotopes in hawthorn leaves (δ65Cumean=+0.23 ) when compared to the control sites (δ65Cumean=+0.55 ). Differences in isotopic signatures in vegetation can be interpreted as representing two possible Zn sources with signatures imparted on soil from: 1) Zn mineralisation (sphalerite), or 2) Zn contents in carbonate minerals within the host limestone sequence.
This study demonstrates that plant geochemistry at Nevinstown successfully detected Zn anomalies in all investigated species and hawthorn showed the clearest enrichment of Zn peaks and the lowest impact of seasonal variations. Plants are providing the geochemical signature of a large volume of soil horizons which is one of the advantages of using biogeochemical prospecting over traditional
exploration methods. Furthermore, this thesis contributes to a better understanding of biogeochemical metal cycling in the surficial environment and for the development of new geochemical tools for Zn-Pb
exploration in temperate European climates.
The research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement n? [608069].
Advisors/Committee Members: McClenaghan, Sean.
Subjects/Keywords: Biogeochemistry; Mineral Exploration; Isotopes
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APA (6th Edition):
Mavri?, D. (2019). Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration. (Thesis). Trinity College Dublin. Retrieved from http://hdl.handle.net/2262/88768
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mavri?, Danijela. “Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration.” 2019. Thesis, Trinity College Dublin. Accessed March 05, 2021.
http://hdl.handle.net/2262/88768.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mavri?, Danijela. “Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration.” 2019. Web. 05 Mar 2021.
Vancouver:
Mavri? D. Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration. [Internet] [Thesis]. Trinity College Dublin; 2019. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2262/88768.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mavri? D. Fingerprinting isotopic signatures for metal enrichment in European trees: Developing vectors for mineral exploration. [Thesis]. Trinity College Dublin; 2019. Available from: http://hdl.handle.net/2262/88768
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
3.
Parvar, Kiyavash.
Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
.
Degree: Geological Sciences and Geological Engineering, 2016, Queens University
URL: http://hdl.handle.net/1974/15234
► In this thesis, the procedure of conducting magnetic surveys from a UAV platform is investigated. In the process of evaluating UAVs for such surveys, magnetic…
(more)
▼ In this thesis, the procedure of conducting magnetic surveys from a UAV platform is investigated. In the process of evaluating UAVs for such surveys, magnetic sensors capable of operating on a UAV platform were tested using a terrestrial survey, as well as on a UAV-platform. Results were then compared to a model of the area generated using a proton precession magnetometer.
Magnetic signature of the UAVs are discussed and impact values are calculated. For a better understanding of the magnetic fields around UAVs some micro-surveys were conducted with the help of a fluxgate magnetometer around two UAVs. Results of such surveys were used to determine a location to mount the magnetometer during the survey.
A test survey over a known anomaly (a visible chromite outcrop in Oman) is conducted in order to determine the feasibility of using UAV-based magnetometry for chromite exploration. Observations were taken at two different elevations in order to generate a 3-D model of the magnetic field. Later, after applying upward continuation filters and comparing the calculated results to the real values, the reliability and uncertainty levels of such filters were investigated.
Results show that magnetometery on UAV platforms is feasible. Unwanted signals can be noticeable and produce fake anomalies by the end of each line because of the swinging effect of the suspended magnetometer below the UAV. This should be reduced by hardware and software modifications i.e. applying non-linear filters and mounting the sensor on a rigid rod. Also, it was derived that the error level associated with upward continuation filters exceeds 45% and thus, using such filters instead of actual observations is not suggested in gradiometry. Moreover, 3-D magnetic gradient surveys can be beneficial for future inversion problems.
Subjects/Keywords: Mineral Exploration
;
Magnetic Signature
;
Magnetometry
;
UAV
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APA (6th Edition):
Parvar, K. (2016). Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/15234
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Parvar, Kiyavash. “Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
.” 2016. Thesis, Queens University. Accessed March 05, 2021.
http://hdl.handle.net/1974/15234.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Parvar, Kiyavash. “Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
.” 2016. Web. 05 Mar 2021.
Vancouver:
Parvar K. Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
. [Internet] [Thesis]. Queens University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1974/15234.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Parvar K. Development and Evaluation of Unmanned Aerial Vehicle (UAV) Magnetometry Systems
. [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/15234
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Brzozowski, Matthew Jacek.
Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits.
Degree: PhD, Earth and Environmental Sciences, 2018, University of Windsor
URL: https://scholar.uwindsor.ca/etd/7501
► The mineralogy and mineral chemistry of Fe-Ti oxides, sulfides, and vein-hosted silicates has been used to characterize the petrogenesis of the Eastern Gabbro of…
(more)
▼ The mineralogy and
mineral chemistry of Fe-Ti oxides, sulfides, and vein-hosted silicates has been used to characterize the petrogenesis of the Eastern Gabbro of the Coldwell Complex, Ontario, to better characterize the processes that generated and modified copper and platinum-group element (PGE) mineralization that it contains, and to develop and test
exploration tools in this system. Understanding these processes is critical to an understanding of conduit-type Cu-PGE systems and their
exploration potential. Fe-Ti oxides in the Eastern Gabbro exhibit a continuum of mineralogically distinct exsolution textures. Trellis-type intergrowths, which have systematically higher Fe3+ : Fe2+ and multivalent-element concentrations than cloth-type intergrowths, formed through subsolidus oxidation of the latter by a CO2-rich fluid. Variable distribution of cloth- and trellis-type intergrowths in different rock types and mineralized occurrences in the Eastern Gabbro indicate that they experienced different degrees of fluid-induced oxidation. The elements that are typically used for petrogenesis were not affected by subsolidus oxidation as this process only affected the concentration of a few multivalent elements. Accordingly, oxide chemistry indicates that the metabasalt and Layered Series of the Eastern Gabbro crystallized from magmas that experienced little to no magma mixing, with the latter having crystallized from a more evolved magma than the former. The later, mineralized Marathon Series crystallized from mixtures of several physically and compositionally distinct magmas. These features are consistent with formation of the mineralization in the Marathon Series in a magma conduit. The data from the Eastern Gabbro indicate that the chemistry of oxides is not a robust indicator of mineralization because oxide chemistry is the same in mineralized and barren rock, and because mineralization could not be accurately identified using previously-developed petrogenetic tools that use oxide chemistry. An understanding of the processes that generate and modify mineralization can help identify
exploration targets in variably mineralized plutons. The compositional similarity between magmatic and hydrothermal chalcopyrite, which occur throughout the Eastern Gabbro, indicate that the latter formed through the local dissolution and re-precipitation of the former. Variations in whole-rock Cu/Pd and sulfide S/Se demonstrates that two dominant processes generated the variable Cu/Pd mineralization in the Eastern Gabbro. First, mineralized zones in different parts of the system were variably contaminated by rocks with low and high S/Se. Second, sulfides in different zones experienced different R factors, which resulted in mineralization with variable PGE grades. The trace-element chemistry of vein minerals in late-stage hydrothermal veins is largely independent of local controls (e.g., host rock, host
mineral). Although their chemistry appears to vary with proximity to mineralization, this interpretation is misleading as the same variability…
Advisors/Committee Members: Samson, Iain.
Subjects/Keywords: Economic Geology; Exploration; Geochemistry; Mineral chemistry; Mineralogy
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APA ·
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APA (6th Edition):
Brzozowski, M. J. (2018). Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7501
Chicago Manual of Style (16th Edition):
Brzozowski, Matthew Jacek. “Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits.” 2018. Doctoral Dissertation, University of Windsor. Accessed March 05, 2021.
https://scholar.uwindsor.ca/etd/7501.
MLA Handbook (7th Edition):
Brzozowski, Matthew Jacek. “Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits.” 2018. Web. 05 Mar 2021.
Vancouver:
Brzozowski MJ. Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits. [Internet] [Doctoral dissertation]. University of Windsor; 2018. [cited 2021 Mar 05].
Available from: https://scholar.uwindsor.ca/etd/7501.
Council of Science Editors:
Brzozowski MJ. Applications of mineral chemistry to petrogenesis and exploration in conduit-type Cu-PGE deposits. [Doctoral Dissertation]. University of Windsor; 2018. Available from: https://scholar.uwindsor.ca/etd/7501
5.
Bastiani, Alexandre De.
The Unexplored Earth : Inspiring the future of mineral exploration.
Degree: Umeå Institute of Design, 2020, Umeå University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172611
► Very much like the great navigations in the 14th century or the space programs, exploring remote parts of our planet is a dangerous, challenging,…
(more)
▼ Very much like the great navigations in the 14th century or the space programs, exploring remote parts of our planet is a dangerous, challenging, and unknown endeavor that drives human beings. We not only do it to find resources but also for the sake of science, looking for shreds of evidence of a past that we only speculate. Our civilization has been driven by courageous and visionary explorers and now the challenges are different, and they need to be investigated. The Unexplored Earth is a design project that aims to provide a vision of the future of mineral exploration in such an unknown planet, the Earth. Hopefully, the result presented in this paper will serve its purpose of inspiring both the mining industry and geological survey organizations throughout the world in developing new technologies and methods of exploration increasing the rate of discoveries with reduced expenditure in comparison with current scenarios. Pilgrim is an underground drone capable of exploring where humans are not able to go, performing geological, geophysical, and geochemical surveys within the Underground.
Subjects/Keywords: design; concept; epiroc; mineral exploration; Design; Design
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APA (6th Edition):
Bastiani, A. D. (2020). The Unexplored Earth : Inspiring the future of mineral exploration. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172611
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bastiani, Alexandre De. “The Unexplored Earth : Inspiring the future of mineral exploration.” 2020. Thesis, Umeå University. Accessed March 05, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172611.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bastiani, Alexandre De. “The Unexplored Earth : Inspiring the future of mineral exploration.” 2020. Web. 05 Mar 2021.
Vancouver:
Bastiani AD. The Unexplored Earth : Inspiring the future of mineral exploration. [Internet] [Thesis]. Umeå University; 2020. [cited 2021 Mar 05].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172611.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bastiani AD. The Unexplored Earth : Inspiring the future of mineral exploration. [Thesis]. Umeå University; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172611
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
6.
Fu, Lei.
Induced polarization effect in time domain: theory, modeling, and applications.
Degree: MS, Geology & Geophysics, 2011, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/269/rec/1348
► A new theoretical and experimental method of induced polarization (IP) in the time domain is tested with resistivity data and detailed mineralogy of rock samples.…
(more)
▼ A new theoretical and experimental method of induced polarization (IP) in the time domain is tested with resistivity data and detailed mineralogy of rock samples. The Generalized Effective Medium Theory of Induced Polarization (GEMTIP) was originally developed in the frequency domain for explaining the structure-property relationship of rocks. The geoelectrical parameters of this model are determined by the intrinsic petrophysical and geometric characteristics of composite media: the mineralization and/or fluid content of rocks and the matrix composition, porosity, anisotropy, and polarizability of formations. The physical properties of rock samples from exploration or mining sites are often used to assist in planning geological surveys or interpretation of geophysical results. However, electrical property data are often recorded in the time domain. In this paper, the Generalized Efective Medium Theory of Induced Polarization (GEMTIP) is tested with the time domain resistivity data transformed from complex resistivity data. It is demonstrated that the time-domain GEMTIP method can be used to study the induced polarization (IP) effect. Results indicate that the time domain resistivity data from laboratory measurements can be used in inversion routines. With advances in the understanding of the IP effect through the GEMTIP model and wide application of the time domain measurements, detection, and discrimination capability will improve for porphyry systems and other geologic targets, leading to greater efficiency in mineral exploration.
Subjects/Keywords: Exploration; GEMTIP; Induced polarization; Mineral exploration; Resistivity; Time domain
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APA (6th Edition):
Fu, L. (2011). Induced polarization effect in time domain: theory, modeling, and applications. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/269/rec/1348
Chicago Manual of Style (16th Edition):
Fu, Lei. “Induced polarization effect in time domain: theory, modeling, and applications.” 2011. Masters Thesis, University of Utah. Accessed March 05, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/269/rec/1348.
MLA Handbook (7th Edition):
Fu, Lei. “Induced polarization effect in time domain: theory, modeling, and applications.” 2011. Web. 05 Mar 2021.
Vancouver:
Fu L. Induced polarization effect in time domain: theory, modeling, and applications. [Internet] [Masters thesis]. University of Utah; 2011. [cited 2021 Mar 05].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/269/rec/1348.
Council of Science Editors:
Fu L. Induced polarization effect in time domain: theory, modeling, and applications. [Masters Thesis]. University of Utah; 2011. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/269/rec/1348
University of Alberta
7.
Black, Warren E.
Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling.
Degree: MS, Department of Civil and Environmental
Engineering, 2016, University of Alberta
URL: https://era.library.ualberta.ca/files/cj96020871
► Traditional approaches to mineral exploration rely on personal experience, conceptual genetic models, past exploration data, and geological characteristics found in analogous target deposit types to…
(more)
▼ Traditional approaches to mineral exploration rely on
personal experience, conceptual genetic models, past exploration
data, and geological characteristics found in analogous target
deposit types to locate and evaluate prospective areas. With the
increase in both size and complexity of datasets used in mineral
exploration, mineral prospectivity modeling (MPM) provides a means
of exploring highly dimensional geological datasets in a meaningful
way. When exploring for a specific deposit type, prior knowledge
from known mineral deposits within or near the study area and
genetic characteristics of the deposit type are used to understand
exploration factors that indicate the presence of a mineral deposit
(i.e., positive information). A concern is that barren locations
(i.e., negative information) are rarely recorded for widespread use
by others, yet they are as important as positive locations in
training predictive models. It is likely that prospective areas are
not being discovered as current methodologies are heuristic in
nature and do not consider the full spectrum of the truth. A
proposed novel MPM framework provides a means of passing a
stochastic multi-element model and other relevant geological data
to a transfer function that calculates the probability that a
particular mineral deposit type exists at each location. The use of
a multi-element geochemical model allows both positive and negative
information to be equally represented while avoiding heuristic
searches by not using known mineral occurrences as input. In
addition, the multiple realizations of the geochemical model
permits uncertainty to be transferred to the final probabilistic
values at each location. The principle challenge within the
proposed framework is the prediction of the required stochastic
geochemical model. It is desired to have a flexible multi-element
geochemical model that may be used to perform MPM for many deposit
types. In hopes of providing a straightforward multivariate
simulation framework, novel extensions of the decorrelation and
direct cosimulation frameworks that operate in the presence of many
secondary data are developed; however, they fail to adequately
reproduce input multivariate statistics. The introduction of
correlation to the once uncorrelated factors during simulation by
the conditioning of secondary data renders the decorrelation
framework inadequate. While the modification of direct cosimulation
is easy to implement, it is hampered by extreme variance inflation
and an inability to reproduce the input correlation structure. As
the capabilities of the cokriging and hierarchical framework to
model highly dimensional problems had not been demonstrated, they
were both implemented in an attempt to predict 42 variables. A
linear model of coregionalization consisting of 903 direct and
cross-variograms was fitted to the data, however, it did not
adequately capture the spatial structure of the input variables.
The framework also proved to be very computational expensive.
Conversely, the hierarchical framework reasonably…
Subjects/Keywords: Geostatistics; Multivariate Simulation; Mineral Exploration; Mineral Prospectivity Modeling
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APA ·
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Manager
APA (6th Edition):
Black, W. E. (2016). Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cj96020871
Chicago Manual of Style (16th Edition):
Black, Warren E. “Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling.” 2016. Masters Thesis, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/cj96020871.
MLA Handbook (7th Edition):
Black, Warren E. “Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling.” 2016. Web. 05 Mar 2021.
Vancouver:
Black WE. Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/cj96020871.
Council of Science Editors:
Black WE. Multivariate Geostatistical Prediction of Geochemical
Measurements for Use in Mineral Prospectivity Modeling. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/cj96020871
McMaster University
8.
Tschirhart, Peter.
GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP.
Degree: MSc, 2013, McMaster University
URL: http://hdl.handle.net/11375/13130
► With an ever-increasing consumption of natural resources new prospecting techniques are required to satisfy the demand. Geophysical methods are one tool commonly relied upon.…
(more)
▼ With an ever-increasing consumption of natural resources new prospecting techniques are required to satisfy the demand. Geophysical methods are one tool commonly relied upon. New acquisition platforms or survey methodologies provide one way to expand the geophysical capabilities, but are expensive and slow to develop. New processing and interpretation techniques on the other hand provide a rapid means to reinterpret existing datasets with the goal of improving our geologic understanding of a project area. This thesis presents four new ways to extract additional geologic insights from a variety of geophysical datasets. All of the studies are based within the Bathurst Mining Camp, NB. A physical rock property database for the Bathurst Mining Camp is constructed and statistically analyzed in chapter two. Descriptive statistics include mean, standard deviation; first, second and third quartiles are calculated for density and magnetic susceptibility measurements and provided in tables for reference. Bivariate plots are then used to identify trends in the density-magnetic susceptibility relationship. We relate some of our findings to processes involved in the depositional and alteration history of the various lithologies. Comprehensive rock property databases provide valuable constraints for geophysical data processing and are essential for any subsequent geophysical modeling. This is demonstrated with two examples. A joint gravity-magnetic profile model is completed across the geologically complex Nine Mile Synform. The profile reveals deep structure in the Camp down to 5 km depth. A geologically constrained geophysical inversion model of the magnetic anomaly associated with the Armstrong B
mineral deposit reveals this anomaly contains a strong magnetic remanence contribution. The influence of remanence is often ignored in magnetic interpretation and modeling, but vital to achieve a geologically correct solution. In this instance comparison of the calculated remanence direction with the expected Apparent Polar Wander Path defined direction suggests an age of mineralization that is compatible with geological evidence. A new approach to determine the optimum near surface residual magnetic signal is presented in chapter three. Additionally, a new way of locating remanently magnetized bodies is also introduced. This technique inverts frequency domain helicopter-borne electromagnetic data to yield apparent magnetic susceptibility. To locate those zones where the magnetic signal is dominated by remanence the inverted HFEM susceptibility is cross plot against the results of a traditional apparent susceptibility filter. The inverted HFEM susceptibility is independent of remanence while the apparent susceptibility assumes no remanence. Where remanence is present the TMI derived apparent susceptibility does not correlate with the HFEM. These differences are readily evident in a cross plot of the two susceptibilities. To determine a magnetic residual the inverted susceptibility is forward modeled as a series of…
Advisors/Committee Members: Morris, Bill, Joe Boyce, Pavlos Kanaroglou, Earth and Environmental Sciences.
Subjects/Keywords: Geophysics; Earth Science; Mineral Exploration; Gravity Exploration; Magnetic Exploration; Electromagnetic Exploration; Geophysics and Seismology; Geophysics and Seismology
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APA (6th Edition):
Tschirhart, P. (2013). GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/13130
Chicago Manual of Style (16th Edition):
Tschirhart, Peter. “GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP.” 2013. Masters Thesis, McMaster University. Accessed March 05, 2021.
http://hdl.handle.net/11375/13130.
MLA Handbook (7th Edition):
Tschirhart, Peter. “GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP.” 2013. Web. 05 Mar 2021.
Vancouver:
Tschirhart P. GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP. [Internet] [Masters thesis]. McMaster University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11375/13130.
Council of Science Editors:
Tschirhart P. GEOPHYSICAL PROCESSING AND INTERPRETATION WITH GEOLOGIC CONTROLS: EXAMPLES FROM THE BATHURST MINING CAMP. [Masters Thesis]. McMaster University; 2013. Available from: http://hdl.handle.net/11375/13130
University of South Africa
9.
Sturdy, Joline.
Accounting and taxation practices of selected mining exploration companies in South Africa
.
Degree: 2011, University of South Africa
URL: http://hdl.handle.net/10500/4909
► The promulgation of the Mineral and Petroleum Resources Development Act 28 of 2002 (MPRDA) led to a significant increase in the number of junior exploration…
(more)
▼ The promulgation of the
Mineral and Petroleum Resources Development Act 28 of 2002
(MPRDA) led to a significant increase in the number of junior
exploration companies. In this
regard, International Financial Reporting Standard (IFRS) 6 allows companies to develop their
own accounting policies for
exploration and evaluation expenditure. However, there is no
definition of either prospecting or
exploration in the Income Tax Act 58 of 1962 (Income Tax
Act).
The objective of this study was to perform a literature review and to carry out empirical research
by using questionnaires that were distributed to junior
exploration companies to investigate
whether accounting and taxation practices are consistently applied. Accordingly, the findings
confirmed that the accounting and taxation practices followed by junior
exploration companies
are not consistently applied.
Advisors/Committee Members: Cronjé, Christo Johannes (advisor), Wingard, H. C. (Prof.) (advisor).
Subjects/Keywords: Mineral rights;
Mineral law;
Exploration cost;
Prospecting cost;
Pre-production cost;
Mining taxation;
Extractive industry and junior exploration company
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APA ·
Chicago ·
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CSE |
Export
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Manager
APA (6th Edition):
Sturdy, J. (2011). Accounting and taxation practices of selected mining exploration companies in South Africa
. (Doctoral Dissertation). University of South Africa. Retrieved from http://hdl.handle.net/10500/4909
Chicago Manual of Style (16th Edition):
Sturdy, Joline. “Accounting and taxation practices of selected mining exploration companies in South Africa
.” 2011. Doctoral Dissertation, University of South Africa. Accessed March 05, 2021.
http://hdl.handle.net/10500/4909.
MLA Handbook (7th Edition):
Sturdy, Joline. “Accounting and taxation practices of selected mining exploration companies in South Africa
.” 2011. Web. 05 Mar 2021.
Vancouver:
Sturdy J. Accounting and taxation practices of selected mining exploration companies in South Africa
. [Internet] [Doctoral dissertation]. University of South Africa; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10500/4909.
Council of Science Editors:
Sturdy J. Accounting and taxation practices of selected mining exploration companies in South Africa
. [Doctoral Dissertation]. University of South Africa; 2011. Available from: http://hdl.handle.net/10500/4909
UNIVERSIDADE FEDERAL DE OURO PRETO
10.
Jaciara Alves Oliveira.
ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL.
Degree: 2011, UNIVERSIDADE FEDERAL DE OURO PRETO
URL: http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=818
► O município de São Lourenço, localizado ao sul do estado de Minas Gerais, integra o Circuito das Águas de Minas, conhecido por abrigar miraculosas águas…
(more)
▼ O município de São Lourenço, localizado ao sul do estado de Minas Gerais, integra o Circuito das Águas de Minas, conhecido por abrigar miraculosas águas minerais. A história da região é cercada de fatos e casos sobre o poder medicinal das águas, reforçando o apego sentimental e cultural da população que, aliado às discussões acerca da importância das águas para o mundo, desenvolveu críticas a respeito do uso e exploração dos recursos hidrominerais do Parque das Águas pela empresa Nestlé Waters, detentora dos direitos de exploração do local. Após a constatação de intervenções influenciadas pela possível exploração indiscriminada do Parque das Águas, um grupo de ambientalistas e membros da população iniciou uma grande mobilização que trouxe repercussões internacionais. A empresa foi chamada a prestar contas à justiça brasileira resultando na formalização de um TAC - Termo de Ajustamento de Conduta, onde a mesma se comprometeu a cessar as atividades ilegais além de reflorestar a mata de pinheiros do Parque, com área de 26m por mata nativa, dentre outras cláusulas previamente acordadas entre as partes. O trabalho abordou também a repercussão do movimento na Europa, principalmente, na Suíça, com referências aos movimentos ambientalistas europeus, às ações da Nestlé em outros países e demais acusações acerca da política da empresa. Atualmente a empresa é bem vista pela população de São Lourenço e tem atuado como parceira da cidade através do incentivo a projetos socioambientais e investimentos na infraestrutura turística do Parque das Águas. A conclusão do trabalho não glorifica nenhuma das partes. Verificam-se perdas e ganhos para todos os envolvidos: a empresa ganhou a harmonia com a cidade, mas perdeu com cumprimento do TAC; o movimento ganhou com a paralisação das atividades irregulares, mas perdeu sua solidez; a cidade ganhou uma empresa que incentiva seus projetos e investe no Parque das Águas, mas perdeu recursos hidrominerais e encontra-se insegura quanto à salvaguardada futura destes recursos. O caso Nestlé serve de alerta às empresas que exploram recursos ambientais e é um exemplo para as demais estâncias do Circuito das Águas (Caxambu, Cambuquira e Lambari) através do incentivo à sociedade na luta pela sustentabilidade.
São Lourenço town, located in southern Minas Gerais state, integrates the so-called Minas Gerais Waters Circuit, known for being home to "miraculous mineral waters. The regional history is surrounded by facts and tales about the medicinal power of the waters, reinforcing the sentimental and cultural attachment of the people which, allied to discussions on the importance of the waters for the world, has brought some other discussions on the use and exploration of the hydrologic resources of the Parque das Águas by Nestlé Waters company, holder of the exploration rights for the region. After the observation of interventions influenced by the possible indiscriminate exploration of the Parque das Águas, a group of environmentalists and members of the population started up a large movement that…
Advisors/Committee Members: Geraldo de Souza Ferreira, Hubert Mathias Peter Roeser, Auxiliadora Maria Moura Santi.
Subjects/Keywords: impactos ambientais; turismo; sustentabilidade; exploração; água mineral.; environmental impact; tourism; sustainability; exploration; mineral water.; AGUA
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APA (6th Edition):
Oliveira, J. A. (2011). ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL. (Thesis). UNIVERSIDADE FEDERAL DE OURO PRETO. Retrieved from http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=818
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oliveira, Jaciara Alves. “ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL.” 2011. Thesis, UNIVERSIDADE FEDERAL DE OURO PRETO. Accessed March 05, 2021.
http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=818.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oliveira, Jaciara Alves. “ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL.” 2011. Web. 05 Mar 2021.
Vancouver:
Oliveira JA. ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL. [Internet] [Thesis]. UNIVERSIDADE FEDERAL DE OURO PRETO; 2011. [cited 2021 Mar 05].
Available from: http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=818.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oliveira JA. ÁGUAS (DE) SÃO LOURENÇO: INVESTIGAÇÃO SOBRE OS IMPACTOS DA EXPLORAÇÃO DE ÁGUA MINERAL NO TURISMO SUSTENTÁVEL. [Thesis]. UNIVERSIDADE FEDERAL DE OURO PRETO; 2011. Available from: http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=818
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
11.
Pisiak, Laura.
Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia.
Degree: School of Earth and Ocean Sciences, 2015, University of Victoria
URL: http://hdl.handle.net/1828/6992
► In the Canadian Cordillera, Mesozoic calcalkaline and alkaline intrusive igneous rocks that are prospective for hosting porphyry Cu-Au mineralization may be overlain by thick glacial…
(more)
▼ In the Canadian Cordillera, Mesozoic calcalkaline and alkaline intrusive igneous rocks that are prospective for hosting porphyry Cu-Au mineralization may be overlain by thick glacial overburden. Previous studies have shown that magnetite from ore deposits has a unique trace element signature that differs from magnetite in common igneous or metamorphic rocks. This study investigated if the composition of ore-related magnetite in till could provide a unique
exploration tool to locate porphyry deposits in glaciated terrain. Bulk till samples were collected over an area of ~700 km2 surrounding the Mount Polley porphyry Cu-Au deposit, south-central British Columbia. Twenty elements were measured by LA-ICP-MS in ~50 detrital magnetite grains in each of 20 till samples. Previously proposed discrimination diagrams are proven to be of limited use in correctly identifying ore-related magnetite. Therefore, linear discriminant analysis (LDA) was performed on a compiled dataset of magnetite compositions from various porphyry deposits and intrusive igneous rocks in order to rigorously redefine the chemical signature of hydrothermal magnetite from porphyry systems. Application of the LDA models to magnetite in till found that the dispersal of hydrothermal grains from Mount Polley is coincident with the deposit and the interpreted ice-flow history. Anomalous concentrations of hydrothermal magnetite grains in till are detected up to 2.5 km west-southwest and 4 km northwest of the deposit, indicating that magnetite has a strong potential to be an effective indicator in
mineral exploration for porphyry systems.
Advisors/Committee Members: Canil, Dante (supervisor).
Subjects/Keywords: magnetite; mineral chemistry; hydrothermal; porphyry; indicator mineral; exploration; till provenance; discriminant analysis; Mount Polley
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APA (6th Edition):
Pisiak, L. (2015). Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/6992
Chicago Manual of Style (16th Edition):
Pisiak, Laura. “Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia.” 2015. Masters Thesis, University of Victoria. Accessed March 05, 2021.
http://hdl.handle.net/1828/6992.
MLA Handbook (7th Edition):
Pisiak, Laura. “Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia.” 2015. Web. 05 Mar 2021.
Vancouver:
Pisiak L. Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia. [Internet] [Masters thesis]. University of Victoria; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1828/6992.
Council of Science Editors:
Pisiak L. Magnetite as an indicator mineral in till: a test using the Mount Polley porphyry Cu-Au deposit, British Columbia. [Masters Thesis]. University of Victoria; 2015. Available from: http://hdl.handle.net/1828/6992
University of Utah
12.
Loury, Patrick C.
Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization.
Degree: MS, Geology & Geophysics, 2015, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3821/rec/1573
► Forsterite (Fo) is developed extensively in dolomite marbles in the Alta, Utah contact aureole. Through the Fo zone and much of the periclase (Per) zone,…
(more)
▼ Forsterite (Fo) is developed extensively in dolomite marbles in the Alta, Utah contact aureole. Through the Fo zone and much of the periclase (Per) zone, the number of forsterite (Fo) crystals/mol Fo increases and the average Fo grain size decreases as the Alta Stock intrusive contact is approached. Excluding the innermost Per zone, ?18O (Carbonate-Fo) values increasingly depart from equilibrium values with increased metamorphic grade. These textural and oxygen isotope trends reflect progressively greater reaction affinity (Ar) driven by the combined effects of elevated temperatures, faster heating rates, and decreasing X(CO2) in infiltrating fluids toward the igneous contact. Significant variation exists in the number of Fo crystals/mol Fo, d18O (carbonate), and ?18O (Carbonate-Fo) between strata within individual outcrops at several locations. At most sites, the number of Fo crystals/mol Fo and d18O value of carbonate matrix are negatively correlated, suggesting that increased infiltration of low X(CO2) and low d18O fluid drives Ar higher. In the outer Fo zone, neither ?18O nor d18O (carbonate) correlate with Fo crystals/mol Fo values because infiltrating fluids have largely exchanged isotopically with the marble in this part of the aureole. A suite of trace elements were analyzed in samples from the Alta Stock, skarns, Alta aureole marbles, and the carbonate protolith. To detect concentration anomalies element concentrations are normalized to Al, which is demonstrated to be immobile in the marbles of the aureole. Positive concentration anomalies are documented for Ba, Cu, Pb, Zn, Sr, Rb, and K to varying distances from the intrusive contact. Fe and Mn anomalies are absent, suggesting that crystallizing skarn minerals effectively exhausted the Fe and Mn supply of infiltrating fluids before they reached significant distance in the aureole. Within the zone of 18O/16O depletion (< 400 m from the igneous contact), negative correlations are observed between concentrations and d18O (carbonate) for Cu, Pb, Zn, and Ba, suggesting a link between elevated fluid flux and the addition of these elements to the carbonate protolith. These results demonstrate that integrated isotopic and trace element data have potential applications in the exploration for skarn deposits and other intrusion-centered, carbonate-hosted metallic deposits.
Subjects/Keywords: Alta Stock; Metamorphism; Mineral Exploration; Oxygen Isotopes; Trace Elements
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APA ·
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APA (6th Edition):
Loury, P. C. (2015). Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3821/rec/1573
Chicago Manual of Style (16th Edition):
Loury, Patrick C. “Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization.” 2015. Masters Thesis, University of Utah. Accessed March 05, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3821/rec/1573.
MLA Handbook (7th Edition):
Loury, Patrick C. “Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization.” 2015. Web. 05 Mar 2021.
Vancouver:
Loury PC. Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization. [Internet] [Masters thesis]. University of Utah; 2015. [cited 2021 Mar 05].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3821/rec/1573.
Council of Science Editors:
Loury PC. Metamorphism and fluid-rock interaction in the alta, Utah contact aureole: identification of forsterite reaction pathways, evaluation of reaction overstepping, and trace element characterization. [Masters Thesis]. University of Utah; 2015. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3821/rec/1573
University of Ottawa
13.
Chen, Shishi.
Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
.
Degree: 2018, University of Ottawa
URL: http://hdl.handle.net/10393/37750
► The Athabasca Basin in northern Saskatchewan, Canada, hosts the world's largest high-grade U resources along the unconformity between sandstones and underlying crystalline basement rocks. Finding…
(more)
▼ The Athabasca Basin in northern Saskatchewan, Canada, hosts the world's largest high-grade U resources along the unconformity between sandstones and underlying crystalline basement rocks. Finding U deposits is difficult in the interior of the Athabasca Basin where the sandstone cover is thick. This study focuses on detecting footprints of U and REE mineralization in sandstones in the Wheeler River property which hosts Phoenix and Gryphon U deposits and Maw Zone REE mineralization. The principal component analysis (PCA) reveals that U is positively associated with REEs-Y-Cu-B-Na-Mg-Ni-Be. The evidence suggests that U was dispersed into sandstones together with these elements during the uraniferous hydrothermal activity. The elements positively associated with U are high in concentrations above the deposit, forming a “chimney-like” or “hump-like” distribution in a vertical section. Their enrichment patterns are explained by the ascent of basement fluids through faults to sandstones. The Pb isotope data and the PCA suggest that the secondary dispersion has minor effect on the overall lithogeochemistry of sandstones. The composition of sandstones in the Wheeler River property (excluding sandstones overlying Phoenix deposit) shows that U is positively associated REEs-Y-Cu-Na-Zn-W-Pb-Co-Cr-Sc-Mo-V-Ni-B-Mg. This element association is similar to that of sandstones overlying the Phoenix deposit, indicating that the uraniferous hydrothermal activity was extensive in the entire property. In contrast, sandstones in unmineralized areas in Athabasca Basin show a positive association of U with Th-Ti-Zr-Hf, indicating that heavy minerals, such as zircon and oxide minerals, are major hosts of U. The sandstones in REE-rich Maw Zone show that U is strongly associated with V-Cr-Fe-Ni-Cu-Na-Li-Ba, but very weakly with HREEs. Relative enrichment of HREEs-Y-P in the Maw Zone suggests xenotime as the predominant host of the HREEs. The occurrence of xenotime is confirmed by a mineralogical study.
Using the elements associated with U, linear discriminant analysis and random forest are able to differentiate sandstones into three; above the Phoenix deposit, in the Wheeler River property and backgrounds with high accuracy. The receiver operating characteristic, precision/recall curve and area under cover suggest that random forest is preferred method to linear discriminant analysis. This work demonstrates that the statistical analysis of lithogeochemical data of sandstones is useful in detecting REE mineralization and footprints of deeply buried U mineralization.
Subjects/Keywords: Unconformity type uranium deposit;
compositional data;
Mineral exploration;
Footprint;
Machine learning
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APA ·
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Manager
APA (6th Edition):
Chen, S. (2018). Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/37750
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Shishi. “Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
.” 2018. Thesis, University of Ottawa. Accessed March 05, 2021.
http://hdl.handle.net/10393/37750.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Shishi. “Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
.” 2018. Web. 05 Mar 2021.
Vancouver:
Chen S. Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
. [Internet] [Thesis]. University of Ottawa; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10393/37750.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen S. Detecting Sandstones Affected by Hydrothermal Activity Related to Uranium and REE Mineralization by Multivariate Analysis of Lithogeochemical Data, Athabasca Basin, Canada
. [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/37750
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Adelaide
14.
Caruso, Alicia Sophia.
Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia.
Degree: 2020, University of Adelaide
URL: http://hdl.handle.net/2440/127003
► The world’s demand for metals is increasing and there is a growing need for mineral explorers to locate new ore deposits. Globally, discovery of economic…
(more)
▼ The world’s demand for metals is increasing and there is a growing need for
mineral explorers to locate new ore deposits. Globally, discovery of economic
mineral deposits is becoming more challenging due to the increasing depths where
exploration is being conducted to discover
mineral deposits. Most surficial deposits have been discovered, driving
exploration into terrains with substantial weathered regolith cover, and requiring new
exploration methods. Current traditional
exploration methods including geophysics, high density soil sampling and geochemical analysis can be expensive, time consuming and limited in geographic extent. Although remote sensing methods have been applied to regional-scale
mineral exploration, there is potential for them to be used more fully in regions where regolith is a continuing challenge. The overarching aim of this multidisciplinary thesis is to develop methods that integrate forms of remote sensing and geospatial information to reduce the risk and cost of
exploration in weathered terrains by identifying and mapping surface alteration related to buried mineralisation. The study area used to develop and test these methodologies was the southern Gawler Ranges, South Australia, a region prospective for gold, porphyry-copper and epithermal-silver mineralisation. This semi-arid environment is moderately vegetated with limited geological exposures. Most basement rocks are overlain by approximately 100 m of weathered cover materials presenting challenges for both
exploration and remote sensing methods. The broad research aim was addressed through three more specific objectives: 1. Development of an objective regolith-landform map using geospatial data and a repeatable methodology that can be used to guide the early stages of
exploration potential assessment; 2. Characterisation of surface expressions of alteration mineralogy and interpretation of landscape processes using airborne hyperspectral imagery and mineralogical data; and 3. Integration of surface geochemistry, mineralogy and regolith-landform mapping to understand and map surface signatures of potential buried mineralisation. An unsupervised classification was applied to geospatial data layers including a Digital Elevation Model, Topographic Position Index and potassium, thorium and uranium gamma-ray radiometrics. This was clustered to generate an objective regolith-landform map representing the main regolith-landform types. This map captured many of the features typically mapped by traditional regolith-landform mapping as assessed by a statistical goodness of fit measure. While not a replacement for the resource-intensive traditional regolith maps derived from extensive field work, this method used freely available geospatial data an objective, repeatable methodology to produce a map that has potential to increase understanding of the landscape and assist targeting of areas of alteration and mineralisation for more detailed
exploration. Airborne hyperspectral imagery was analysed by Spectral Feature Fitting, matching image spectra…
Advisors/Committee Members: Lewis, Megan (advisor), Clarke, Kenneth (advisor), Tiddy, Caroline (advisor), Adelaide Law School (school).
Subjects/Keywords: Remote Sensing; Geospatial; Hyperspectral; Gawler Ranges; Geochemistry; Mineral Exploration; Regolith
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APA (6th Edition):
Caruso, A. S. (2020). Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/127003
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Caruso, Alicia Sophia. “Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia.” 2020. Thesis, University of Adelaide. Accessed March 05, 2021.
http://hdl.handle.net/2440/127003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Caruso, Alicia Sophia. “Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia.” 2020. Web. 05 Mar 2021.
Vancouver:
Caruso AS. Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia. [Internet] [Thesis]. University of Adelaide; 2020. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2440/127003.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Caruso AS. Integration of advanced remote sensing and geospatial methodologies to enhance mineral exploration: An example from the southern Gawler Ranges, South Australia. [Thesis]. University of Adelaide; 2020. Available from: http://hdl.handle.net/2440/127003
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Adelaide
15.
Hulme, Karen Angela.
Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions.
Degree: 2010, University of Adelaide
URL: http://hdl.handle.net/2440/63079
► This project is the first major characterisation of Eucalyptus camaldulensis biogeochemistry for the purpose of developing its applications for mineral exploration and environmental management. Eucalyptus…
(more)
▼ This project is the first major characterisation of Eucalyptus camaldulensis biogeochemistry for the purpose of developing its applications for
mineral exploration and environmental management. Eucalyptus camaldulensis is one of the most widely distributed trees in Australia and is particularly abundant along watercourses in inland Australia, such as in southeastern central Australia, where this study was conducted.
A methodology has been developed and refined for effectively and efficiently sampling Eucalyptus camaldulensis plant organs in biogeochemical surveys. Sampling consistency and minimal contamination are the most important considerations for this methodology. If these can be minimised and accounted for the geological and environmental influences on plant biogeochemistry can be more readily isolated.
Leaves were the most conveniently sampled medium and provided the greatest reproducibility and background to anomaly contrast for most trace elements. Leaf biogeochemistry typically showed little relationship with stream sediment substrate, but instead had a closer association with the underlying bedrock substrate and shallow groundwater. The regolith-landform setting of sample trees is also a significant control on plant biogeochemistry, in particular the relationship to channel floodouts, depositional settings and local impediments to channel flow.
In order to account for temporal variations in biogeochemistry, Eucalyptus camaldulensis leaves were collected every three months over a two year period between March 2003 and March 2005. There were notable differences in the overall chemical composition between periods of non-growth (autumn and winter) and growth (spring and summer). Most of the elements recorded their highest concentrations during periods of growth, corresponding with an increase in temperature, rainfall and extended periods of daylight, and therefore peak photosynthetic and evapotranspiration activity. These temporal variations are mostly indicative of the availability of water from rainfall and the opportunistic dimorphic root system of the Eucalyptus camaldulensis accessing and switching between the shallow soilalluvium pore water and the deeper groundwater.
Detrital contributions to plant tissue are also need to be recognised when interpreting biogeochemical results. Investigation into the surficial contamination of the Eucalyptus
camaldulensis through surface secondary electron images and backscattered electron images from a scanning electron microscope (SEM) revealed that the vertically hanging, large, smooth waxy leaves are typically poor repositories for detrital material.
Detailed case studies in the Au-prospective Tibooburra area and the polymetallic Pine Creek (Broken Hill) area demonstrate the variable environmental controls on the biogeochemistry at the catchment scale. In particular, the underlying geological substrate, groundwater at the sediment-bedrock interface and regolith-landform setting were important catchment-scale controls on the biogeochemistry of tree samples.
By…
Advisors/Committee Members: Hill, Steven Matthew (advisor), Rogers, Stephen Lloyd (advisor), Facelli, Jose Maria (advisor), School of Earth and Environmental Sciences (school).
Subjects/Keywords: biogeochemistry; regolith; mineral exploration; river red gums (eucalyptus camaldulensis)
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APA (6th Edition):
Hulme, K. A. (2010). Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/63079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hulme, Karen Angela. “Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions.” 2010. Thesis, University of Adelaide. Accessed March 05, 2021.
http://hdl.handle.net/2440/63079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hulme, Karen Angela. “Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions.” 2010. Web. 05 Mar 2021.
Vancouver:
Hulme KA. Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions. [Internet] [Thesis]. University of Adelaide; 2010. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2440/63079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hulme KA. Eucalyptus camaldulensis (river red gum) biogeochemistry: an innovative tool for mineral exploration in the Curnamona Province and adjacent regions. [Thesis]. University of Adelaide; 2010. Available from: http://hdl.handle.net/2440/63079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Shepherd, Patrick H.M.
Chromite Crystal Structure and Chemistry applied as an Exploration Tool.
Degree: 2015, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/2685
► The spinel group minerals have long been of interest to the geosciences due to their use as indicator minerals. Unit cell is a structural measure…
(more)
▼ The spinel group minerals have long been of interest to the geosciences due to their use as indicator minerals. Unit cell is a structural measure controlled by composition but is also affected by pressure and temperature relations through order-disorder. This study attempted to look at the applications of unit cell in exploration. The implementation of µXRD for this purpose required the creation the Slice Integration Technique to improve signal over background. Compositions of binary spinels can be approximated through their correlation with unit cell. Possible applications include gemology and curatorial studies, where the nondestructive nature of µXRD is highly advantageous and kimberlite vs non-kimberlite discrimination. The analysis of an indicator mineral was conducted using a field portable XRD and could determine isostructural grains in a field setting or unit cell could be used in the field in conjunction with other new field-portable technologies.
Subjects/Keywords: Chromite; Unit Cell; Spinel; Mineral Exploration; Kimberlite; Geology
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APA (6th Edition):
Shepherd, P. H. M. (2015). Chromite Crystal Structure and Chemistry applied as an Exploration Tool. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/2685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shepherd, Patrick H M. “Chromite Crystal Structure and Chemistry applied as an Exploration Tool.” 2015. Thesis, University of Western Ontario. Accessed March 05, 2021.
https://ir.lib.uwo.ca/etd/2685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shepherd, Patrick H M. “Chromite Crystal Structure and Chemistry applied as an Exploration Tool.” 2015. Web. 05 Mar 2021.
Vancouver:
Shepherd PHM. Chromite Crystal Structure and Chemistry applied as an Exploration Tool. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Mar 05].
Available from: https://ir.lib.uwo.ca/etd/2685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shepherd PHM. Chromite Crystal Structure and Chemistry applied as an Exploration Tool. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/2685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
17.
KALVERAM, ANN-KRISTIN.
Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration.
Degree: School of Natural Sciences. Discipline of Geology, 2018, Trinity College Dublin
URL: http://hdl.handle.net/2262/82844
► The enhancement of mineral exploration is essential for the growing demand of base metals in the world. Successful geochemical surveys in soil and till have…
(more)
▼ The enhancement of
mineral exploration is essential for the growing demand of base metals in the world. Successful geochemical surveys in soil and till have led to numerous discoveries. However, most of these deposits are shallow and situated in areas unaffected by anthropogenic activities. Exploring for more deeply buried mineralisation, and in areas such as anthropogenic influenced lands offer new challenges for
mineral exploration.
This thesis demonstrates geochemical investigations to advance
mineral exploration tools and their implications, using the example of the Ballinalack carbonate-hosted Zn-Pb deposit in the Irish Midlands, Ireland. Sulphide samples (sphalerite and pyrite) were texturally characterised using SEM imaging technique and afterwards analysed by in situ laser ablation ICP-MS to understand proximal-distal fingerprints within the mineralisation lens and their elemental pool. Furthermore, a trace element as well as Cu and Zn isotope approach have been applied to surficial sediments (soil and till) to understand how elevated concentrations of trace elements can be detected and transported above a shallowly (1.5 m) and deeply buried (150 m) sulphide lens in an area affected by former glaciation and modified by agricultural practices.
The trace element signature of the sulphides at Ballinalack consists of Ag, As, Co, Fe, Ga, Hg, Mo, Ni, Pb, Sb and Zn, among others, which broadly coincide with elevated concentrations of Pb, Cd, As, Ag, Tl, Zn, Sb and Ba in soil and till above the shallowly buried sulphide mineralisation. Any overprint from glaciation or active agriculture-pasture, would seem to be minimal; however, the deeply buried mineralisation was not detected by trace-element analyses of the overlying soil/till. These findings contradict the prevailing reduced chimney model for the transport of elements towards the surface. The anomalous soil and till concentrations of trace elements mentioned above can be spatially associated by heavy ?65 Cu and light ?66 Zn isotope signatures; the heavy Cu isotope signatures reflect direct weathering of the sulphides resulting in the soil anomaly. The Zn isotope signature may indicate that sphalerite is also a source of the trace-elemental anomaly and hence the mineralisation in the underlying bedrock is the source of the fingerprint in the soil and till. Accordingly, this approach confirms the feasibility of stable metal isotopes for use as an additional tool in
mineral exploration.
Advisors/Committee Members: McClenaghan, Sean.
Subjects/Keywords: till; trace elements; soil; mineral exploration; non-traditional stable isotopes; sulphides
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APA ·
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APA (6th Edition):
KALVERAM, A. (2018). Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration. (Thesis). Trinity College Dublin. Retrieved from http://hdl.handle.net/2262/82844
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
KALVERAM, ANN-KRISTIN. “Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration.” 2018. Thesis, Trinity College Dublin. Accessed March 05, 2021.
http://hdl.handle.net/2262/82844.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
KALVERAM, ANN-KRISTIN. “Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration.” 2018. Web. 05 Mar 2021.
Vancouver:
KALVERAM A. Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration. [Internet] [Thesis]. Trinity College Dublin; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2262/82844.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
KALVERAM A. Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration. [Thesis]. Trinity College Dublin; 2018. Available from: http://hdl.handle.net/2262/82844
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Curtin University of Technology
18.
Sykes, Michael P.
Some techniques for the enhancement of electromagnetic data for mineral exploration.
Degree: 2000, Curtin University of Technology
URL: http://hdl.handle.net/20.500.11937/922
► The usefulness of electromagnetic (EM) methods for mineral exploration is severely restricted by the presence of a conductive overburden. Approximately 80% of the Australian continent…
(more)
▼ The usefulness of electromagnetic (EM) methods for mineral exploration is severely restricted by the presence of a conductive overburden. Approximately 80% of the Australian continent is covered by regolith that contains some of the most conductive clays on Earth. As a result, frequency-domain methods are only effective for near surface investigations and time-domain methods, that are capable of deeper exploration, require the measurement of very small, late-time signals. Both methods suffer from the fact that the currents in the conductive Earth layers contribute a large portion of the total measured signal that may mask the signal from a conductive target. In the search for non-layered structures, this form of geological noise is the greatest impediment to the success of EM surveys in conductive terrains. Over the years a range of data acquisition and processing techniques have been used in an effort to enhance the response of the non-layered target and thereby increase the likelihood of its detection.The combined use of a variety of survey configurations to assist exploration and interpretation is not new and is practiced regularly. The active nature of EM exploration means that the measured response is determined to a large degree by the way in which the Earth is energised. Geological structures produce different responses to different stimuli. In this work, two new methods of data combination are used to transform the measured data into a residual quantity that enhances the signature of non-layered geological structures. Based on the concept of data redundancy and tested using the results of numerical modelling, the new combinations greatly increase the signal to noise ratio for targets located in a conductive environment by reducing the layered Earth contribution. The data combinations have application to frequency-domain and time-domain EM surveys and simple interpretive rules can be applied to the residuals to extract geological parameters useful in exploration. The new methods make use of inductive loop sources and can therefore also be applied to airborne surveys.Airborne surveys present special difficulties due to the data acquisition procedures commonly used. Flight-line related artefacts such as herringbones detract from the appearance of maps and make boundary definition more difficult. A new procedure, based on the Radon transform, is used to remove herringbones from airborne EM maps and locate the conductive boundaries correctly, making interpretation more reliable and easier. In addition, selective filtering of the Radon transform data enables the enhancement or attenuation of specific linear features shown in the map to emphasise features of interest. Comparison of the Radon transform procedures with the more conventional Fourier transform methods shaves the Radon transform processing to be more versatile and less prone to distortion of the features in a map.The procedures developed in this work are applied to field data with good results.
Subjects/Keywords: mineral exploration;
electromagnetic data
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APA (6th Edition):
Sykes, M. P. (2000). Some techniques for the enhancement of electromagnetic data for mineral exploration.
(Thesis). Curtin University of Technology. Retrieved from http://hdl.handle.net/20.500.11937/922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sykes, Michael P. “Some techniques for the enhancement of electromagnetic data for mineral exploration.
” 2000. Thesis, Curtin University of Technology. Accessed March 05, 2021.
http://hdl.handle.net/20.500.11937/922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sykes, Michael P. “Some techniques for the enhancement of electromagnetic data for mineral exploration.
” 2000. Web. 05 Mar 2021.
Vancouver:
Sykes MP. Some techniques for the enhancement of electromagnetic data for mineral exploration.
[Internet] [Thesis]. Curtin University of Technology; 2000. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/20.500.11937/922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sykes MP. Some techniques for the enhancement of electromagnetic data for mineral exploration.
[Thesis]. Curtin University of Technology; 2000. Available from: http://hdl.handle.net/20.500.11937/922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
19.
Cramer, Timothy F.
Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada.
Degree: 2014, University of Nevada – Reno
URL: http://hdl.handle.net/11714/2978
► The Desert National Wildlife Refuge in southern Nevada has been selected for remote sensing analysis as part of a mineral assessment required for renewal of…
(more)
▼ The Desert National Wildlife Refuge in southern Nevada has been selected for remote sensing analysis as part of a
mineral assessment required for renewal of
mineral withdrawal. The area of interest is nearly 3,000 km and covers portions of 5 different ranges with little to no infrastructure. Assessing such a large area using traditional field methods is very time intensive and expensive. The study described here serves as a pilot study, testing the capability of Landsat ETM+ and ASTER satellite imagery to remotely
identify areas of potentially mineralized lithologies. This is done by generating a number of band ratio, band index, and
mineral likelihood maps identifying 5 key
mineral classes (silica, clay, iron oxide, dolomite and calcite), which commonly have patterned zonation around ore deposits. When compiled with available geologic and geochemical data sets, these intermediate products can provide guidance for targeted field evaluation and
exploration. Field observations and spectral data collected in the laboratory can then be
integrated with ASTER imagery to guide a Spectral Angle Mapper algorithm to generate
a distribution map of the five
mineral classes.
The methods presented found the ASTER platform to be capable of remotely
assessing the distribution of various lithologies and the
mineral potential of large, remote
areas. Furthermore areas of both high and low potential for ore deposits can be identified
and used to guide field evaluation and
exploration. Remote sensing studies of this caliber can be performed relatively quickly and inexpensively resulting in datasets, which can
result in more accurate mapping and the identification of both lithologic boundaries and previously unidentified alteration associated with mineralization. Future
mineral
assessments and
exploration activity should consider similar studies prior to field work.
Advisors/Committee Members: Muntean, John L. (advisor), Calvin, Wendy M. (advisor), Bassett, Scott D. (committee member).
Subjects/Keywords: ASTER; Economic Geology; Geologic Mapping; Landsat ETM+; Land Use; Mineral Exploration
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APA (6th Edition):
Cramer, T. F. (2014). Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/2978
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cramer, Timothy F. “Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada.” 2014. Thesis, University of Nevada – Reno. Accessed March 05, 2021.
http://hdl.handle.net/11714/2978.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cramer, Timothy F. “Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada.” 2014. Web. 05 Mar 2021.
Vancouver:
Cramer TF. Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada. [Internet] [Thesis]. University of Nevada – Reno; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11714/2978.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cramer TF. Using Landsat ETM+ and ASTER Sensors to Aid the Mineral Assessment of the Desert National Wildlife Refuge, Clark and Lincoln Counties, Nevada. [Thesis]. University of Nevada – Reno; 2014. Available from: http://hdl.handle.net/11714/2978
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Cantor, Bradford M.
Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada.
Degree: 2012, University of Nevada – Reno
URL: http://hdl.handle.net/11714/3751
► The Scraper Springs project, held by Cordilleran Exploration Inc. (Cordex), is a multi-target prospect located in northwestern Elko, County, Nevada, approximately 8 miles northeast of…
(more)
▼ The Scraper Springs project, held by Cordilleran
Exploration Inc. (Cordex), is a multi-target prospect located in northwestern Elko, County, Nevada, approximately 8 miles northeast of the Midas district. Regionally, the property can be considered to be along trend with the northern-most projection of the Carlin trend, approximately 25 miles north of the Dee/Rossi area. The eastern limit of Northern Nevada Rift (NNR) is also considered to border the western margin of the Scraper Springs property. The geology at Scraper is characterized by an exposure of Paleozoic rocks from the upper-plate Vinini Formation above the Roberts Mountains thrust through a window of Eocene and Miocene volcanic cover. Additionally, there is an exposure of intrusive Eocene diorite, dated at 38.9 ± 1.0 Ma by K/Ar techniques, adjacent to the Paleozoic window.
Exploration efforts at Scraper Springs date back to 1983; various
exploration efforts since 1983 reveal three types of mineralized targets at Scraper Springs: Carlin-type mineralization hosted at depth below the Roberts Mountains thrust, epithermal vein-style mineralization hosted in volcanics, and polymetallic Au-bearing skarn mineralization hosted in Paleozoic sedimentary rocks in contact with the diorite intrusion. The present study employs field mapping techniques to document the geology and alteration of the diorite intrusion and adjacent silicified/advanced argillic lithocap breccias. Petrography and sodium-cobaltinitrite staining supplement field observations to aid in understanding alteration events. Geochemical data from topaz-rich samples are considered to help classify the hydrothermal system present at Scraper in addition to soil and rock chip samples. Finally, drill-hole data from 9 holes were logged and drawn in cross-section to offer one three-dimensional possibility of the hydrothermal system at Scraper. Results suggest the Eocene diorite intrusion has undergone significant potassic alteration. A separately-mapped unit of quartz syenite is also documented, revealing potassic alteration haloes around its margins. Petrography indicates this type of potassic alteration is overprinted by propylitic and ultimately sericitic events. Advanced argillic alteration in the breccia zones adjacent to the diorite intrusion is also profound and exhibits several different events. Early vuggy quartz-alunite alteration is common throughout both breccia zones and is followed by an advanced argillic assemblage containing zones of pyrophyllite, topaz, kaolinite, and alunite. Late chalcedony overprints much of the earlier alteration. In general, each pulse of advanced argillic mineralization is separated by a breccia event. Overall, the system at Scraper Springs appears to reflect that of a porphyry-epithermal transition zone. This evidence, coupled with high fluorine and molybdenum geochemistry, and alteration zoning patterns documented in the present study suggest future
exploration at Scraper could credibly target a Climax-type molybdenum porphyry similar to the Mount Hope deposit in Eureka…
Advisors/Committee Members: Thompson, Tommy B. (advisor), Henry, Christopher (committee member), Vasquez, Victor (committee member).
Subjects/Keywords: Elko County; Geologic Map; Gold; Mineral Exploration; Molybdenum; Nevada
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APA ·
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Export
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APA (6th Edition):
Cantor, B. M. (2012). Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/3751
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cantor, Bradford M. “Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada.” 2012. Thesis, University of Nevada – Reno. Accessed March 05, 2021.
http://hdl.handle.net/11714/3751.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cantor, Bradford M. “Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada.” 2012. Web. 05 Mar 2021.
Vancouver:
Cantor BM. Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada. [Internet] [Thesis]. University of Nevada – Reno; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11714/3751.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cantor BM. Petrography and Field Mapping of Eocene Intrusions and Adjacent Breccia Zones at the Scraper Springs Prospect, Elko County, Nevada. [Thesis]. University of Nevada – Reno; 2012. Available from: http://hdl.handle.net/11714/3751
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Adelaide
21.
Johnson, Ashlyn Kate.
Regolith and associated mineral systems of the Eucla Basin, South Australia.
Degree: 2015, University of Adelaide
URL: http://hdl.handle.net/2440/95312
► This thesis documents previous research into the heavy mineral sands (HMS) of the Eucla Basin. It presents new research designed to incorporate previous work, and…
(more)
▼ This thesis documents previous research into the heavy
mineral sands (HMS) of the Eucla Basin. It presents new research designed to incorporate previous work, and to then encourage a broadening of research into the future. Specifically, this thesis is dedicated to demonstrating the importance of encompassing all aspects of research within a
mineral system rather than isolating system components. In order to understand the complex regolith geology expressed within the Eucla Basin and its contained HMS deposits, a multi-faceted approach is applied, targeting two broad research areas. The first research area addresses processes acting prior to deposition of the Eucla Basin sediments, including providing constraints on the source of the sediments using U-Pb zircon analysis. The conclusions of this area of the research are that the dominant U-Pb zircon population lies between 1100 and 1250 Ma. Further, that these zircon populations match with the ages of zircon growth events in two of the most proximal potential source regions, the Musgrave Province and the Albany-Fraser Province. This research has also shown that due to the similar magmatic and metamorphic history of the Musgrave Province and Albany-Fraser Province it is difficult to distinguish between the possible sources regions using the U-Pb zircon data alone, highlighting the need for other methods. This thesis also found that kyanite and staurolite, which are common minerals in the Eucla Basin HMS, do not have an identified source in the Musgrave Province but do have a potential source in the Mount Barren Group in the Albany-Fraser Province. Finally, this thesis clearly demonstrates that the recognition of a likely more western source of zircon, kyanite and staurolite requires a revision of existing models of Eucla Basin HMS provenance, which focuses on the Musgrave Province as the most likely source. The second research area concentrates on the syn- and post-depositional history of the sedimentary rocks inclusive of depositional processes, weathering and groundwater interactions, the combination of which are expressed in multi-element whole rock major, trace element and isotope geochemical data. These data can be combined with other components of the HMS
mineral assemblage, together with an understanding of the denudation history of the possible source regions, to establish a landscape evolution model from source, through transport to the site of deposition. The conclusion of this section of research is that stratigraphy of the sequences hosting HMS deposits at Jacinth requires revision because stratigraphic boundaries were assigned to horizons that are the result of post-depositional acid-sulphate weathering and groundwater processes. Finally, differentiation of rock types into process related sub-groupings is vital for understanding
exploration geochemical data but cannot be achieved using major element chemistry alone. A broad suite of trace elements and selected isotope data are required, including strontium/calcium and strontium isotope ratios for the…
Advisors/Committee Members: Hill, Steven Matthew (advisor), Giles, David (advisor), School of Earth and Environmental Sciences (school).
Subjects/Keywords: regolith; geology; geochemistry; mineral exploration; Eucla Basin; heavy mineral sands; rutile; zircon; landscape evolution; zircon provenance; Southern Australia; South Australia
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APA (6th Edition):
Johnson, A. K. (2015). Regolith and associated mineral systems of the Eucla Basin, South Australia. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/95312
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Johnson, Ashlyn Kate. “Regolith and associated mineral systems of the Eucla Basin, South Australia.” 2015. Thesis, University of Adelaide. Accessed March 05, 2021.
http://hdl.handle.net/2440/95312.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Johnson, Ashlyn Kate. “Regolith and associated mineral systems of the Eucla Basin, South Australia.” 2015. Web. 05 Mar 2021.
Vancouver:
Johnson AK. Regolith and associated mineral systems of the Eucla Basin, South Australia. [Internet] [Thesis]. University of Adelaide; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2440/95312.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Johnson AK. Regolith and associated mineral systems of the Eucla Basin, South Australia. [Thesis]. University of Adelaide; 2015. Available from: http://hdl.handle.net/2440/95312
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
22.
Claus, Russell.
‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling.
Degree: MA, 2015, McMaster University
URL: http://hdl.handle.net/11375/16737
► Geochemical samplers carry out manual labour in difficult and dangerous conditions while largely unsupervised. This paper explores questions regarding the labour effort provided by these…
(more)
▼ Geochemical samplers carry out manual labour in difficult and dangerous conditions while largely unsupervised. This paper explores questions regarding the labour effort provided by these workers which often goes above and beyond the level necessary to maintain employment and at times endangers their personal safety. This extra effort is provided despite relatively high levels of worker autonomy, low levels of supervision, and little apparent economic incentive. Analysis of worker-level interviews using a number of possible theoretical frameworks indicates that more coercive factors such as direct managerial control and employment insecurity are unable to fully explain sampler behaviour and, instead, participant accounts indicate a form of active worker consent to increased labour effort and risk taking. This is a gendered worker consent based on a form of contingent upon the specific context of geochemical sampling. These specific contingent factors are: a working class masculinity derived from the hard manual labour of the work; the wilderness context that facilitates tropes of ‘man versus nature’ reinforcing the masculine workplace culture and obscuring the appropriation of surplus by more easily allowing the workplace to be interpreted as non-capitalist; and a fraternal masculinity resulting from the crew-based workplace organization and highly male dominated workforce composition, intensified by the conforming pressure of isolated camp life. This specific masculinity forms a basis of consent by which the autonomy afforded to workers by the labour process of geochemical sampling helps rather than hinders the imperative of management to encourage workers to exert the maximum effort.
Thesis
Master of Arts (MA)
Advisors/Committee Members: Lewchuk, Wayne, Work and Society.
Subjects/Keywords: Masculinity; Gender; Geochemical Sampling; Mineral Exploration; Worker Consent; Subjectivity; Labour Effort; Wilderness; Fraternalism
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APA (6th Edition):
Claus, R. (2015). ‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/16737
Chicago Manual of Style (16th Edition):
Claus, Russell. “‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling.” 2015. Masters Thesis, McMaster University. Accessed March 05, 2021.
http://hdl.handle.net/11375/16737.
MLA Handbook (7th Edition):
Claus, Russell. “‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling.” 2015. Web. 05 Mar 2021.
Vancouver:
Claus R. ‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling. [Internet] [Masters thesis]. McMaster University; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11375/16737.
Council of Science Editors:
Claus R. ‘Because It Was Hardcore and It Was Cool’: Masculinity as the Basis of Consent in Geochemical Sampling. [Masters Thesis]. McMaster University; 2015. Available from: http://hdl.handle.net/11375/16737
Queens University
23.
Joyce, Nicholas.
Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
.
Degree: Geological Sciences and Geological Engineering, 2016, Queens University
URL: http://hdl.handle.net/1974/15204
► The chemical compositions, modal mineralogy, and textural variability of interstitial minerals in sandstones of the Athabasca Group strata in the vicinity of the McArthur River…
(more)
▼ The chemical compositions, modal mineralogy, and textural variability of interstitial minerals in sandstones of the Athabasca Group strata in the vicinity of the McArthur River unconformity-related uranium deposit were characterized using a combination of short wave infrared spectroscopy (SWIR), lithogeochemistry, scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and laser ablation mass spectrometry (LA-ICP-MS) to determine the residence sites of pathfinder trace elements. The importance of integrating in-situ mineral chemistry with whole-rock analyses resides in the possibility to establish the mineralogical and paragenetic context of geochemical signatures in defining the footprint of the deposit. Located in the Athabasca Basin, Saskatchewan, Canada, the deposit is situated below ~550 m of quartz arenitic sandstones that are strongly silicified between depths of approximately 200-400 m. The silicified layer exhibits significant control on the distribution of alteration minerals, and appears to have restricted both the primary and secondary dispersion of pathfinder trace elements, which include U, radiogenic Pb isotopes, V, Ni, Co, Cu, Mo, As, Zn, and REEs. Diagenetic background sandstones contain assemblages of illite, dickite, aluminum-phosphate-sulfate (APS) minerals, apatite, and Fe-Ti oxide minerals. Altered sandstones contain assemblages of Al-Mg chlorite (sudoite), alkali-deficient dravite, APS minerals, kaolinite, illite, and oxide minerals. Throughout the sandstones, APS minerals account for the majority of the Sr and LREE concentrations, whereas late pre-ore chlorite, containing up to 0.1 wt.% Ni, accounts for the majority of Ni concentrations. Cobalt, Cu, Mo, and Zn occur predominantly in cryptic sub-micron sulfide and sulfarsenide inclusions in clay mineral aggregates and in association with paragenetically-late Fe-Ti oxides. Uranium occurs predominantly in cryptic micro-inclusions associated with pyrite in late-stage quartz overgrowths, and with paragenetically late Fe-Ti oxide micro-inclusions in kaolinite. Additionally, up to 0.2 wt.% U is cryptically distributed in post-ore Fe-oxide veins. Early diagenetic apatite, monazite and apatite inclusions in detrital quartz, and detrital zircon also contribute significant U and HREE to samples analyzed with an aggressive leach such as Aqua Regia. Detailed LA-ICP-MS chemical mapping of interstitial assemblages, detrital grains, and cements provides new insights into the distribution and inventory of pathfinder elements in the footprint of the McArthur River uranium deposit.
Subjects/Keywords: LA-ICP-MS
;
Geochemistry
;
Mineral Exploration
;
McArthur River
;
Economic Geology
;
Athabasca Basin
;
Pathfinder Elements
;
Uranium
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Joyce, N. (2016). Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/15204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Joyce, Nicholas. “Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
.” 2016. Thesis, Queens University. Accessed March 05, 2021.
http://hdl.handle.net/1974/15204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Joyce, Nicholas. “Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
.” 2016. Web. 05 Mar 2021.
Vancouver:
Joyce N. Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
. [Internet] [Thesis]. Queens University; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1974/15204.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Joyce N. Alteration mineralogy and pathfinder element inventory of the McArthur River unconformity-related uranium deposit, Canada
. [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/15204
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
24.
Maedel, Robin.
Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
.
Degree: Geological Sciences and Geological Engineering, Queens University
URL: http://hdl.handle.net/1974/23927
► Raglan Mine is located on the Ungava peninsula, Québec, Canada. It’s a Ni-Cu-PGE magmatic sulphide deposit undergoing brownfield exploration. Given the available data from Raglan…
(more)
▼ Raglan Mine is located on the Ungava peninsula, Québec, Canada. It’s a Ni-Cu-PGE magmatic sulphide deposit undergoing brownfield exploration. Given the available data from Raglan Mine and the underutilization of geophysical data integration in mineral exploration, this thesis’ purpose is to investigate the utility of data integration. Specifically, four objectives are set to integrate petrophysical and geophysical data in forward and inversion modelling of Zone 5-8 at Raglan Mine. The first two objectives are met through forward modelling a 3D geological model. Magnetic and gravity forward models are compared to observed data. The major outcome establishes a macro-magnetic susceptibility maximum for the ultramafic of 0.31 SI. Vertical gravity modelling shows lows over sediments, and highs over basalts and an intermediate high over the ultramafic. Additionally, the resolvability of ore targets is investigated, showing that these targets are unresolvable using airborne and terrestrial magnetic and gravity methods. These results are incorporated in inversion modelling. Inversion modelling is an optimization problem, which is non-unique, meaning many solutions could fit. This issue is mitigated through constraints from input data and reference models (cooperative inversion). Objectives 3 and 4 are met by running single parameter and cooperative inversions. Outcomes of single parameter inversions show that magnetic inversions are effective in outlining the UM unit to a depth of ~1000-1250m with a cut off of 0.05 SI. Single parameter gravity gradient inversions outline lower density sediments and higher density basalts. The ultramafic is outlined to depths of ~560-910m (cut off 0-0.3 g/cm3) after which ambiguity exists due to density overlap with basalt. Gravity gradient inversions are enhanced through the cooperative magnetic isosurface reference model, which also balances out the impact of the surface geology constraint. The gravity gradient isosurface constraint on the cooperative magnetic inversion causes the ultramafic limbs to diverge. Overall, forward modelling is able to approximate observed data, and single parameter and cooperative inversion modelling are able to position the magnetic ultramafic and higher and lower density sediments and basalts in geologically and geophysically logical
locations. This approach has promising applications in other zones.
Subjects/Keywords: Forward Modelling
;
Geophysics
;
Mineral Exploration
;
Inversion
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APA (6th Edition):
Maedel, R. (n.d.). Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/23927
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Maedel, Robin. “Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
.” Thesis, Queens University. Accessed March 05, 2021.
http://hdl.handle.net/1974/23927.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Maedel, Robin. “Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
.” Web. 05 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Maedel R. Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
. [Internet] [Thesis]. Queens University; [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1974/23927.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
Council of Science Editors:
Maedel R. Integrating Petrophysical and Geophysical Data in Forward and Inversion Modelling of Zone 5-8, Raglan Mine, Quebec, Canada
. [Thesis]. Queens University; Available from: http://hdl.handle.net/1974/23927
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
25.
Mitchell, Charlotte.
Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges.
Degree: 2017, University of Adelaide
URL: http://hdl.handle.net/2440/119328
► The aim of this thesis is to determine the relative contribution of lateral, as opposed to vertical, dispersion of the geochemical signals of basement-hosted mineralisation…
(more)
▼ The aim of this thesis is to determine the relative contribution of lateral, as opposed to vertical, dispersion of the geochemical signals of basement-hosted mineralisation in prospective geological provinces that are mantled by transported cover. The study focuses on three areas within and on the margins of, the highly-mineralised Broken Hill Block and the Barrier Ranges in western New South Wales. Fowlers Creek overlies low-grade metasedimentary bedrock with no known mineralisation on the eastern margins of the Barrier Ranges. Stream sediments show a downstream decreasing trend in concentrations in both Pb and Zn with values decreasing by 50% over 7 km of creek. Lead and Ag values were less important along Fowlers Creek in terms of biogeochemical results, with concentrations at background levels Pb 0.27 ppm and Ag 3.04 ppb. Rather, elements of interest along Fowlers Creek included; Cs, Y, U, Co and Ni. These elements peaked at 2 distinct points along the creek, by an order of magnitude above background, at points where the local geology interrupts the flow of the stream base aquifer (SBA). Pine Creek cross-cuts the partially exposed Pinnacles Pb-Zn-Ag mine. Stream sediment samples contain elevated concentrations of Pb, Zn and Ag (Pb 4.5x and Ag 3.5x background values observed along Fowlers and Umberumberka Creeks) for at least 4.5 km downstream of mineralisation. River red gum (RRG) leaves from trees within the creek provided the clearest delineation of the underlying mineralisation. Lead and Ag concentrations steadily increase toward mineralisation and reach concentrations 2.5 orders of magnitude above background immediately above mineralisation. Leaf samples collected after a severe El Niño event where the previous year’s rainfall was 188 mm, had Pb and Ag concentrations 5 -10 times greater than samples from the same trees collected after a La Niña event where the previous year’s rainfall was 605 mm. These results demonstrate that changes in available water plays on the SBA and the significant role it plays in diluting the resulting metal concentration within the trees and the importance of temporal variation. Umberumberka Creek is underlain by high-grade metamorphic rocks with numerous small
mineral occurrences. Umberumberka Creek discharges at the western margin of the Broken Hill Block as an alluvial fan system which extends at least 10 km onto the Mundi Mundi Plain. This area is underlain by prospective bedrock but is buried by up to 150 m of transported sediments. On the plains, stream sediment results reflected a catchment average that was carried 10 km onto the plains before values decreased. Silver results on the plains had a mean value of 30 ppb and are comparable to soil survey results obtained by an
exploration company over an area of Pb-Ag-Zn mineralisation identified beneath 150+ m of cover, situated on the fan floodout boundaries of Umberumberka Creek. The biogeochemical results for Umberumberka Creek fall within the same range of values as Fowlers creek, suggesting that these values are the natural…
Advisors/Committee Members: Giles, David (advisor), School of Physical Sciences : Earth Sciences (school).
Subjects/Keywords: Geochemical dispersion; biogeochemistry; geochemistry; Broken Hill; Eucalyptus camaldulensis; mineral exploration; landscape geochemistry
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APA (6th Edition):
Mitchell, C. (2017). Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/119328
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mitchell, Charlotte. “Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges.” 2017. Thesis, University of Adelaide. Accessed March 05, 2021.
http://hdl.handle.net/2440/119328.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mitchell, Charlotte. “Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges.” 2017. Web. 05 Mar 2021.
Vancouver:
Mitchell C. Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges. [Internet] [Thesis]. University of Adelaide; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2440/119328.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mitchell C. Lateral and Vertical Geochemical Dispersion into Deep Cover: 4D Landscape Geochemistry and Biogeochemistry of the Barrier Ranges. [Thesis]. University of Adelaide; 2017. Available from: http://hdl.handle.net/2440/119328
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
26.
McGladrey, Alexandra Jane.
The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
.
Degree: Geological Sciences and Geological Engineering, 2014, Queens University
URL: http://hdl.handle.net/1974/8671
► Exploration for large zinc silicate deposits is more challenging than zinc sulfide deposits, as they do not exhibit similar geophysical anomalies. The Vazante deposit, which…
(more)
▼ Exploration for large zinc silicate deposits is more challenging than zinc sulfide deposits, as they do not exhibit similar geophysical anomalies. The Vazante deposit, which is the world’s largest zinc silicate deposit, occurs in brecciated dolomite and comprises mainly willemite with various proportions of hematite, and minor franklinite and sphalerite. In the Vazante region, the exploration challenge is enhanced as outcrops are rare, bedrock generally sits below 10s of metres of laterite cover and barren hematite-rich breccias have a similar geophysical signature to willemite ore bodies. In order to evaluate the applications of geophysical surveys in the exploration of this type of deposit, data from 475 samples were investigated from drill holes representative of the various types of ore, host rocks and zones of known geophysical anomalies in the Vazante District. Geochemical (ICP-MS and XRF) and mineralogical (optical, EMPA, SEM and MLA) data were integrated with physical rock properties (density, magnetic susceptibility and K-U-Th gamma ray spectrometry) to assist in finding new ore zones. The most distinct physical property of the ore is density (3.0-4.3 g/cm3), compared with the host rocks (2.7-3.0 g/cm3). This is due to high proportion of denser minerals (hematite and willemite) in the ore. However, barren hematite breccias also have high densities (3.0-4.5 g/cm3). The zinc ore and hematite breccias yielded higher magnetic susceptibilities (0.1-38 x10-3 SI) than the surrounding host rocks, with the highest values associated with greater proportions of franklinite and magnetite (7-38 x10-3 SI). The zinc ore has an elevated U concentration (up to 33ppm) relative to the various host rocks (up to 7 ppm), yielding higher gamma spectrometric values. The results of this investigation indicate that an integration of magnetic, gravimetric and radiometric surveys would be required to identify zinc silicate ore zones and potentially differentiate them from barren hematite breccias and host rocks.
Subjects/Keywords: Gamma Ray Spectrometry
;
Mineral Exploration
;
Physical Rock Properties
;
Brasilia Fold Belt
;
Zinc Silicate Deposits
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APA ·
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Export
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Manager
APA (6th Edition):
McGladrey, A. J. (2014). The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8671
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McGladrey, Alexandra Jane. “The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
.” 2014. Thesis, Queens University. Accessed March 05, 2021.
http://hdl.handle.net/1974/8671.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McGladrey, Alexandra Jane. “The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
.” 2014. Web. 05 Mar 2021.
Vancouver:
McGladrey AJ. The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
. [Internet] [Thesis]. Queens University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1974/8671.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McGladrey AJ. The Integration of Physical Rock Properties, Mineralogy and Geochemistry for the Exploration of Large Hypogene Zinc Silicate Deposits: a Case Study of the Vazante Zinc Deposits, Minas Gerais, Brazil
. [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/8671
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
27.
Moncada de la Rosa, Jorge Daniel.
Winning Silver.
Degree: PhD, Geosciences, 2013, Virginia Tech
URL: http://hdl.handle.net/10919/52861
► The search for mineral deposits is a time consuming, risky and very expensive process. Applying new models and methods provides a competitive advantage in the…
(more)
▼ The search for
mineral deposits is a time consuming, risky and very
expensive process. Applying new models and methods provides a competitive
advantage in the search for
mineral deposits because an explorationist can
quickly evaluate potential targets and eliminate areas without good potential for
mineralization.
This dissertation presents a practical technique for prediction to finding
precious metal mineralization at Guanajauato mining district (GMD) base on
theoretical and experimental studies of fluids properties,
mineral phase
equilibrium, physical and chemical mechanisms. Making the technique highly
transportable so that it can be applied in the field during an
exploration program
base on petrographic characteristics of
mineral textures produced during boiling
events in quartz, calcite and adularia, and fluid inclusions contained in these
phases. While this work was conducted in GMD, the results should be applicable
in
exploration for epithermal deposits worldwide.
The GMD is one of the largest silver producing districts in the world. Ore
shoots are localized along three major northwest trending vein systems, the La
Luz, Veta Madre and Vetas de la Sierra. More than 1200 samples were collected
from surface outcrops, underground mine and historical and recent drill core.
Traverses perpendicular to veins in all system were also conducted. Most of the
samples (approximately 90%) were also assayed for Au, Ag, Cu, Pb, Zn, As, Sb.
Samples from the GMD show a wide range in silica textures are indicative
of rapid precipitation, such as occurs when fluids boil. Other
mineral phases,
including illite, rhombic adularia and bladed calcite are also indicative of rapid
growth in a hydrothermal system and are characteristic of boiling systems.
Because boiling is an effective mechanism for precipitating gold and silver from
hydrothermal fluids, the presence of
mineral textures indicative of boiling is a
desirable feature in
exploration. In many samples, textural evidence for boiling is
supported by coexisting liquid-rich and vapor-rich fluid inclusions, or Fluid
Inclusion Assemblages consisting of only vapor-rich inclusions, suggesting
"flashing" of the hydrothermal fluids. Textural and fluid inclusion evidence for
boiling has been observed in the deepest levels of the GMD, suggesting that
additional precious metal resources may occur beneath these levels.
Advisors/Committee Members: Bodnar, Robert J. (committeechair), Rimstidt, James Donald (committee member), Johnson, Neil Evan (committee member), Campbell, James B. Jr. (committee member).
Subjects/Keywords: epithermal precious metals deposits; mineral exploration; boiling textures; flashing; fluid inclusions; Guanajuato mining distribution
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APA (6th Edition):
Moncada de la Rosa, J. D. (2013). Winning Silver. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52861
Chicago Manual of Style (16th Edition):
Moncada de la Rosa, Jorge Daniel. “Winning Silver.” 2013. Doctoral Dissertation, Virginia Tech. Accessed March 05, 2021.
http://hdl.handle.net/10919/52861.
MLA Handbook (7th Edition):
Moncada de la Rosa, Jorge Daniel. “Winning Silver.” 2013. Web. 05 Mar 2021.
Vancouver:
Moncada de la Rosa JD. Winning Silver. [Internet] [Doctoral dissertation]. Virginia Tech; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10919/52861.
Council of Science Editors:
Moncada de la Rosa JD. Winning Silver. [Doctoral Dissertation]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/52861
University of Adelaide
28.
Reid, Nathan.
Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration.
Degree: 2009, University of Adelaide
URL: http://hdl.handle.net/2440/59980
► Vegetation sampling is an effective exploration technique in areas of transported cover where other techniques have been of limited success. Several plant species were sampled…
(more)
▼ Vegetation sampling is an effective
exploration technique in areas of transported cover where other techniques have been of limited success. Several plant species were sampled along
transects across 9 known Au ore bodies; Triodia pungens was found give a Au, As, ±Zn, ±S, ±Ce and ±La signature which represented mineralisation through cover materials and Eucalyptus brevifolia was found to give a geobotanical and ±Ca, ±Mg, P, S and Zn signature of underlying geological structure. The Hyperion prospect was used as a ‘blind’ target as there was no background information available until after interpretation was carried out. Mineralisation was located at the contact between granite and dolerite, biogeochemical signatures from E. brevifolia and Acacia bivenosa showed areas of change in ±Au, Ba, Ce, ±Cu, La, ±Mn, Nd, P, S, Sm, Y and Zn which corresponded to this contact. All species in the Pine Creek Orogen were able to present areas elevated in Au, As, ±Zn, ±S, ±Mo and ±Cu which provide future drilling targets. Biogeochemical sampling was able to determine the location of mineralisation at each site and identify underlying substrate changes, however, background knowledge relating to regolith, geology, hydrology and geophysics are important in aiding the interpretation of the elemental data as each component of the substrate influences the elements which a plant will uptake.
Mineral exploration in Australia has been driven by the search for large ore deposits close to the surface. This has led to the need to develop technologies for detecting
mineral deposits
under cover, which can be up to several hundred metres of transported sediments. The aim of this research was to test the feasibility of using vegetation biogeochemical sampling over
known Au deposits within semi-arid and arid terrains. Biogeochemical sampling has the advantages of being cost effective, sustainable, environmentally friendly and relatively easy to perform.
Nine field sites were covered, 4 in the Tanami Region (Coyote, Larranganni, Hyperion and Titania), 4 in the Pine Creek Orogen (Johns Hill, Great Northern, Glencoe and McKinlay) and 1 in the Gawler Craton (Tunkillia). At each of these sites the dominant species were sampled and the elemental concentrations of the plant were analysed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to test if they were able to detect buried mineralisation. In general, all species identified as being deep rooted (larger trees, paperbarks and spinifex) were able to detect mineralisation in each location within multi-element dispersion haloes centring over the projected ore body. Variations were dependant upon species differences and root structures, groundwater influences, and the potential for detrital contamination. In arid Australia, Triodia spp. were shown to be ideal for closely spaced tenement/prospect scale
exploration, and Heteropogon spp. show similar trends for the humid tropics. Eucalyptus/Corymbia spp. are more suitable for widely spaced regional sampling
exploration as they amalgamate a wider…
Advisors/Committee Members: Hill, Steven Matthew (advisor), Lewis, David (advisor), School of Chemical Engineering, School of Earth and Environmental Sciences, Discipline of Geology and Geophysics (school).
Subjects/Keywords: biogeochemistry; Tanami; spinifex; Triodia; phyto-exploration; mineral exploration; Pine Creek; Tunkilla; Acacia; Melaleuca
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APA ·
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APA (6th Edition):
Reid, N. (2009). Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/59980
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Reid, Nathan. “Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration.” 2009. Thesis, University of Adelaide. Accessed March 05, 2021.
http://hdl.handle.net/2440/59980.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Reid, Nathan. “Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration.” 2009. Web. 05 Mar 2021.
Vancouver:
Reid N. Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration. [Internet] [Thesis]. University of Adelaide; 2009. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2440/59980.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Reid N. Phyto-exploration in arid subtropical, arid mediterranean and tropical savanna environments: biogeochemical mechanisms and implications for mineral exploration. [Thesis]. University of Adelaide; 2009. Available from: http://hdl.handle.net/2440/59980
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
Laakso, Kati S.
Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada.
Degree: PhD, Department of Earth and Atmospheric
Sciences, 2015, University of Alberta
URL: https://era.library.ualberta.ca/files/cc247ds30z
► This thesis is composed of three chapters assessing the following specific goals: 1) To evaluate the potential of airborne hyperspectral remote sensing data and techniques…
(more)
▼ This thesis is composed of three chapters assessing
the following specific goals: 1) To evaluate the potential of
airborne hyperspectral remote sensing data and techniques to
delineate the hydrothermal alteration zones of volcanogenic massive
sulfide (VMS) systems in areas of abundant lichens on rock
outcrops; 2) To assess the potential of hyperspectral remote
sensing data and techniques to unmask the hydrothermal alteration
intensity variation of VMS systems; 3) To investigate the effect of
the rock substrates and lichens on the spectral properties of
gossans in the visible-near infrared wavelength region (VNIR,
400-1300 nm); 4) To evaluate the potential of hyperspectral remote
sensing data to unmask the mineralogical properties of the rock
substrates of gossans in the short-wave infrared wavelength region
(SWIR, 1300-2500 nm). First, in Chapter two airborne and ground
hyperspectral data from an economically important Izok Lake VMS
deposit (Nunavut, northern Canada) are used to test the ability to
unmask hydrothermal alteration zones by remote sensing in an area
of abundant low-growing ground cover. The results suggest that
these zones can be delineated by hyperspectral airborne remote
sensing means even if the dense ground cover necessitates the
masking out of many pixels in the scene. In Chapter three, the
applicability of hyperspectral ground and laboratory remote sensing
data are used to estimate the hydrothermal alteration intensity
variation of the Izok Lake deposit. The results suggest that there
are statistically significant relationships between the spectral
properties of the phyllosilicate minerals (white micas and
biotite/chlorite) and alteration indices (the Ishikawa and
chlorite-carbonate-pyrite index). These relationships can be
exploited to investigate the large scale hydrothermal intensity
variation of VMS deposits. Furthermore, the investigations of
Chapters two and three suggest that biotite/chlorite can provide a
stronger vector toward the massive sulfide lenses of the Izok Lake
deposit than white micas. Finally, Chapter four discusses the
optical thickness properties of gossans, and the effects of lichens
and rock substrates on their spectral properties. These phenomena
were investigated by means of laboratory and airborne hyperspectral
remote sensing data from the Cape Smith Belt in northern Canada.
The results indicate that some gossans are optically thin, enabling
the transmission of light into the rock substrate. The implications
are twofold. First, the rock substrates can influence the spectral
shape of the iron oxide minerals, the main constituents of gossans,
in the VNIR wavelength region. Second, the mineralogical properties
of the host rock substrates of optically thin gossans can be
detected by remote sensing means. This finding can be used for
mineral exploration in areas of a known link between specific rock
types and ore deposits. Also, our investigation in the Cape Smith
Belt suggests that spectral mixing between gossans and lichens can
influence the spectral shape of gossans in the…
Subjects/Keywords: Hyperspectral; airborne remote sensing; volcanogenic massive sulfide deposit; gossan; hydrothermal alteration intensity; VMS; mineral exploration; alteration index
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APA ·
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Export
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APA (6th Edition):
Laakso, K. S. (2015). Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cc247ds30z
Chicago Manual of Style (16th Edition):
Laakso, Kati S. “Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada.” 2015. Doctoral Dissertation, University of Alberta. Accessed March 05, 2021.
https://era.library.ualberta.ca/files/cc247ds30z.
MLA Handbook (7th Edition):
Laakso, Kati S. “Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada.” 2015. Web. 05 Mar 2021.
Vancouver:
Laakso KS. Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada. [Internet] [Doctoral dissertation]. University of Alberta; 2015. [cited 2021 Mar 05].
Available from: https://era.library.ualberta.ca/files/cc247ds30z.
Council of Science Editors:
Laakso KS. Applying Hyperspectral Remote Sensing Techniques for the
Detection of Hydrothermal Alteration Zones and Gossans in Northern
Canada. [Doctoral Dissertation]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/cc247ds30z
University of Oulu
30.
Pirttijärvi, M. (Markku).
Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model.
Degree: 2003, University of Oulu
URL: http://urn.fi/urn:isbn:951427119X
► Abstract The thesis deals with numerical methods designed for the modeling and inversion of geophysical electromagnetic (EM) measurements using a conductive thin plate model. The…
(more)
▼ Abstract
The thesis deals with numerical methods designed for the modeling and inversion of geophysical electromagnetic (EM) measurements using a conductive thin plate model. The main objectives are to study the EM induction problem in general and to develop practical interpretation tools for mineral prospecting in particular.
The starting point is a linearized inversion method based on the singular value decomposition and a new adaptive damping method. The inversion method is introduced to the interpretation of time-domain EM (TEM) measurements using a thin plate in free-space. The central part of the thesis is a new approximate modeling method, which is based on an integral equation approach and a special lattice model. At first the modeling method is applied to the interpretation of frequency-domain EM (FEM) data using a thin plate in conductive two-layered earth. After this time-domain responses are modeled applying a Fourier-sine transform of broadband FEM computations.
The results demonstrate that the approximate computational method can model the geophysical frequency and time-domain EM responses of a thin conductor in conductive host medium with sufficient accuracy, and that the inversion method can provide reliable estimates for the model parameters. The fast forward computation enables interactive interpretation of FEM data and feasible forward modeling of TEM responses. The misfit function mapping and analysis of the singular value decomposition have provided additional information about the sensitivity, resolution, and the correlation behavior of the thin plate parameters.
Subjects/Keywords: direct problem; inverse problem; mineral exploration; three-dimensional models
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APA ·
Chicago ·
MLA ·
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APA (6th Edition):
Pirttijärvi, M. (. (2003). Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:951427119X
Chicago Manual of Style (16th Edition):
Pirttijärvi, M (Markku). “Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model.” 2003. Doctoral Dissertation, University of Oulu. Accessed March 05, 2021.
http://urn.fi/urn:isbn:951427119X.
MLA Handbook (7th Edition):
Pirttijärvi, M (Markku). “Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model.” 2003. Web. 05 Mar 2021.
Vancouver:
Pirttijärvi M(. Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model. [Internet] [Doctoral dissertation]. University of Oulu; 2003. [cited 2021 Mar 05].
Available from: http://urn.fi/urn:isbn:951427119X.
Council of Science Editors:
Pirttijärvi M(. Numerical modeling and inversion of geophysical electromagnetic measurements using a thin plate model. [Doctoral Dissertation]. University of Oulu; 2003. Available from: http://urn.fi/urn:isbn:951427119X
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Open Access Theses and Dissertations
