subject:(Mining Engineering)

University of Zambia

1. Kangwa, Sam. Economic consequences of hole deviations in mining operations .

Degree: 2011, University of Zambia

URL: http://hdl.handle.net/123456789/664

► In hard rock mining, drilling and blasting still remain the main method of fragmenting rock. In mining methods involving the use of long holes, extra… (more)

▼ In hard rock mining, drilling and blasting still remain the main method of fragmenting rock. In mining methods involving the use of long holes, extra costs are incurred as a result of consequences associated with hole deviations.The consequences include build-ups, hang-ups and poor rock fragmentation.These consequences usually lead to extra drilling, loss of drill strings, ore dilution, ore loss, increased explosive consumption, time wastage and delays in the chain of production operations, accelerated wear of equipment, extra crushing, extra mineral dressing work, and increased labour costs.Many studies do exist on hole deviations. Whereas sources and effects of the deviations have been investigated, no work has been done on quantification of extra costs due to hole deviations. The objectives, therefore, of this study were to identify consequences associated with hole deviations in mining operations and to quantify the consequences in economic terms. For the study to be meaningful, it was decided to carry out a field investigation at an operating mine. The investigation was carried out at South ore-body shaft of Zambia Consolidated Copper Mines, Nkana Division. Nkana Division operates an underground mine and produces copper and cobalt.The detailed studies of hole deviations and their consequences involved two selected operations, namely stope drilling and raiseboring of Vertical Crater Retreat (VCR) mining method. The studies involved examination of drilling plans, observation of drilling operations, measurement of hole deviations, observation of blasting activities, examination of fragmentation and handling of ore. The studies showed that almost all the holes observed had some degree of deviation. The linear deviation ranged from 0.2m to 12.0m for hole lengths of 30m to 105m. It was subsequently established that there is a strong link between hole deviations and many problems faced in the chain of mining operations.The consequences were identified and correspondingly quantified in economic terms. The cost estimations were done using both rudimental and computer aided calculations. From the estimates, the VCR stope studied accrued approximately US274,000 extra cost, representing 62% of the total operational cost, while the raise pilot hole accrued approximately US6,000 extra cost representing 44% of the total operational cost. These extra costs were as a result of hole deviations.These results clearly show that hole deviations have a significant negative effect on the mining operations and that they lead to poor mining economy.If the quality of production and service holes can be improved, a saving of up to 70% may be achieved in the VCR stope. For an underground mine such as Nkana Division, it may become possible for the mine to compete favourably with other underground and surface mines. For this to be achieved, it is recommended that management should:a) Set up a steering group to look into minimising hole deviations b) Rehabilitate or purchase drilling machines and accessories to improve machine…

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kangwa, S. (2011). Economic consequences of hole deviations in mining operations . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/664

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kangwa, Sam. “Economic consequences of hole deviations in mining operations .” 2011. Thesis, University of Zambia. Accessed July 22, 2019. http://hdl.handle.net/123456789/664.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kangwa, Sam. “Economic consequences of hole deviations in mining operations .” 2011. Web. 22 Jul 2019.

Vancouver:

Kangwa S. Economic consequences of hole deviations in mining operations . [Internet] [Thesis]. University of Zambia; 2011. [cited 2019 Jul 22]. Available from: http://hdl.handle.net/123456789/664.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kangwa S. Economic consequences of hole deviations in mining operations . [Thesis]. University of Zambia; 2011. Available from: http://hdl.handle.net/123456789/664

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Zambia

2. Mutambo, Webby. A geotechnical review and considerations in the design of a new mining method at Konkola Mine .

Degree: 2014, University of Zambia

URL: http://hdl.handle.net/123456789/3189

► Konkola Mine of Konkola Copper Mines Plc comprises of Number 1 and 3 Shafts located on the northern most part of the Zambian Copperbelt. The… (more)

▼ Konkola Mine of Konkola Copper Mines Plc comprises of Number 1 and 3 Shafts located on the northern most part of the Zambian Copperbelt. The mining licence area is characterised by the Kirilabombwe anticline dividing the West and North Limbs striking generally in the northwest to southeast directions. Average dip angles are 60in the Central region, very flat (about 10) towards the „nose‟ area and 60in the North. The Number 1 Shaft is located in southern part of the ore body and lies between 0mN to 3000mN survey mark positions and extends to 800mS. The current development is below 3150 feet level. The Number 3 Shaft is located on the North Limb and the lowest tramming level is at 1850 feet level. Production is currently below the 2270 feet level.As mining is focused below 2270 feet level at Number 3 Shaft and below 3150 feet at Number 1 Shaft, there is need to determine a suitable mining method. This must take into consideration the geotechnical parameters of the host rock and the ore body especially in the nose area where several mining methods have been applied. The dip and the depth from surface influenced the selection of a suitable mining method.This research involved collection of scan line mapped data. The data collected includes joint spacing, joint orientation, joint condition and rock samples to determine the uni-axial compressive strength. The collection of data at the mine site was done in two parts: the first part involved collection of the existing mapped data while the second part involved underground mapping. The collected data was analysed using a computer based spreadsheet to determine the rock mass rating and the information was subjected to evaluation using specialised geotechnical Phase2D software.A review of the design and implementation of the proposed mining method has been made with the aid of a computer model using Phase2D. Ground support requirements for the mining method have also been defined. This selected mining method has been analysed based on the productivity and safe extraction way of taking out the ore body in the nose area of Konkola. The results show the options that involve mining of primary and secondary stopes with different stope spans and will require cemented backfill in primary stopes.

Subjects/Keywords: Mining Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mutambo, W. (2014). A geotechnical review and considerations in the design of a new mining method at Konkola Mine . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/3189

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mutambo, Webby. “A geotechnical review and considerations in the design of a new mining method at Konkola Mine .” 2014. Thesis, University of Zambia. Accessed July 22, 2019. http://hdl.handle.net/123456789/3189.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mutambo, Webby. “A geotechnical review and considerations in the design of a new mining method at Konkola Mine .” 2014. Web. 22 Jul 2019.

Vancouver:

Mutambo W. A geotechnical review and considerations in the design of a new mining method at Konkola Mine . [Internet] [Thesis]. University of Zambia; 2014. [cited 2019 Jul 22]. Available from: http://hdl.handle.net/123456789/3189.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mutambo W. A geotechnical review and considerations in the design of a new mining method at Konkola Mine . [Thesis]. University of Zambia; 2014. Available from: http://hdl.handle.net/123456789/3189

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

3. Smith, Jessica. LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN.

Degree: MS, Department of Geological and Mining Engineering and Sciences, 2012, Michigan Technological University

URL: http://digitalcommons.mtu.edu/etd-restricted/146

► In 2003, a large landslide occurred along the Ontonagon River, located in the Upper Peninsula of Michigan, and adjacent to US-45 in Ontonagon County.… (more)

Subjects/Keywords: Mining Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Smith, J. (2012). LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN. (Masters Thesis). Michigan Technological University. Retrieved from http://digitalcommons.mtu.edu/etd-restricted/146

Chicago Manual of Style (16^th Edition):

Smith, Jessica. “LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN.” 2012. Masters Thesis, Michigan Technological University. Accessed July 22, 2019. http://digitalcommons.mtu.edu/etd-restricted/146.

MLA Handbook (7^th Edition):

Smith, Jessica. “LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN.” 2012. Web. 22 Jul 2019.

Vancouver:

Smith J. LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN. [Internet] [Masters thesis]. Michigan Technological University; 2012. [cited 2019 Jul 22]. Available from: http://digitalcommons.mtu.edu/etd-restricted/146.

Council of Science Editors:

Smith J. LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN. [Masters Thesis]. Michigan Technological University; 2012. Available from: http://digitalcommons.mtu.edu/etd-restricted/146

McGill University

4. Nejati, Houshin. Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation.

Degree: PhD, Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile123156.pdf

► This doctoral thesis investigates the microwave heating process, and its influence upon the physical properties and propagation of fractures in Rocks Under Illumination (RUI).In order… (more)

▼ This doctoral thesis investigates the microwave heating process, and its influence upon the physical properties and propagation of fractures in Rocks Under Illumination (RUI).In order to best understand microwave-assisted rock fracturing, it is critical to investigate the different aspects of this process. These range from the electromagnetic study (i.e., dielectric heating and heat generation), to the mechanical aspects (i.e., heat transfer, strength reduction material mechanics and fracture mechanics), and finally to the final fracturing behaviour of RUIs (i.e., fractography). In order to understand the various elements of the microwave fracturing of rocks, this research is divided into three investigations: 1) An investigation of the magnitude of heat generation within a rock body, and the extent to which illumination parameters can influence the efficiency of a microwave rock fracturing system. In addition, this research sought to expand the scope of microwave rock fracturing beyond the basaltic rocks utilized, and to apply this technique to other rock samples. This research investigates the possibility of substantially reducing the required energy input for a microwave-assisted rock fracturing system. This is made possible when operating at the optimal illumination parameters, with regard to each material property of the rock. To study the microwave heating process of rocks over a wide frequency range, the dielectric properties of some rocks are measured over frequencies ranging from 200 MHz to 20 GHz; with various water content, from fully dried to fully saturated; and at elevated temperatures ranging from 23ºC to 80 °C.2) An investigation of the mechanical aspects of microwaves. This study sought to evaluate the influence of microwave illumination properties (i.e., input microwave power and exposure duration) on the fracture toughness of basalt samples and fracturing. It also attempted to experimentally quantify the fracture strength reduction of Chinese basalt after microwave illumination, at a variety of power levels and durations of exposure. Finally, the investigation sought to evaluate any correlation between the density of micro-cracks caused by microwave heating and any reduction in fracture toughness. This correlation was then modeled with the aid of numerical modeling (i.e., Discrete Element Modeling).3) A quantitative and qualitative investigation of the fracture development of Basalt Specimens Under Microwave Illuminations (BSUI) at macroscopic and microscopic scales. This research describes results of the visual investigations of the Fracture Growth Path (FGP) and the fracturing behaviour of SCBs after being exposed to microwave illuminations. FGPs are classified via their surface temperature level and the required input of microwave power. The Petrography Standard Test aided this approach, and allowed me to best describe fracture behaviour and the interactions between the fractures and mineralogical composition of Chinese basalt. A comprehensive fractographic investigation using Scanning Electron… Advisors/Committee Members: Faramarz P Hassani (Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nejati, H. (2014). Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile123156.pdf

Chicago Manual of Style (16^th Edition):

Nejati, Houshin. “Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation.” 2014. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile123156.pdf.

MLA Handbook (7^th Edition):

Nejati, Houshin. “Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation.” 2014. Web. 22 Jul 2019.

Vancouver:

Nejati H. Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile123156.pdf.

Council of Science Editors:

Nejati H. Analysis of physical properties and thermo – mechanical induced fractures of rocks subjected to microwave radiation. [Doctoral Dissertation]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile123156.pdf

McGill University

5. Sell, Maiko. Generating a 3D training image with low-rank tensor completion: a multi-stage application.

Degree: M. Eng., Department of Mining and Materials, 2015, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile130491.pdf

►

A training image (TI) is an important tool in the context of multiple-point (MPS) and high-order (HOS) statistic spatial simulations. TIs represent the repository of… (more)

▼

A training image (TI) is an important tool in the context of multiple-point (MPS) and high-order (HOS) statistic spatial simulations. TIs represent the repository of patterns and spatial statistics required for drawing values at each grid node in a multiple-point spatial simulation. In turn, spatial simulations provide the framework for the construction of orebody and petroleum reservoir risk and characterization models. Methods of constructing 3D continuous data TIs from adversarial sampling schemes (i.e. non-random) that respect the original sample statistics are important yet uncommon in the literature. Methods for image reconstruction, such as Multi-Stage Matrix Completion (MSMC), work on 2D and with randomly located samples. In the present thesis, drillhole samples of continuous porosity values representing 2% of the exhaustive dataset were used to reconstruct a 3D continuous TI directly from strings of non-randomly located samples using a new method called Multi-Stage Tensor Completion (MSTC). The methodology employs the Low-Rank Tensor Completion (LRTC) algorithm to help reconstruct missing values at the original resolution scale. The MSTC methodology is tested on two benchmark continuous porosity datasets obtained from an exhaustive TI of petroleum reservoir channels (sandstones and clays). The application of MSTC was also applied to an actual mining deposit. Due to confidentiality clauses, only the results obtained from the petroleum reservoir dataset will be discussed in this thesis. In all cases tested, the MSTC method has been found to be effective at reproducing the data statistics. In cases with a very low number of high grade samples, their proportion is not reconstructed as effectively when compared to results obtained using the benchmark cases. The results demonstrate that this method is able to generate continuous data TIs that respect the high order spatial cumulant statistics of the original samples, up to at least the 4th order, all the while maintaining visually reasonable results. The present findings contribute to the development of data-driven methods using MPS and HOS spatial simulation algorithms when modeling continuous attributes of deposits that have complex (nonlinear), non-Gaussian, spatial patterns that are sampled with mining-specific (not random) drill patterns.

Une image d'entraînement (TI) est un outil fondamental dans le domaine des simulations à points multiples (MPS) et des simulations statistiques spatiales d'ordre élevé (HOS). Les TI représentent une base de données statistiques et de configurations spatiales. Celles-ci sont requises pour réaliser la construction de distributions conditionnelles utilisées afin de générer un point simulé à chaque nœud sur une grille de simulation. À leur tour, les simulations spatiales créent l'architecture sur laquelle est basée la construction des modèles de caractérisation et de risque concernant les réservoirs de pétrole et les gisements de minerais. Cependant, les méthodes 3D utilisées pour construire des TI, basées d'une part sur des…

Advisors/Committee Members: In-Ho Jung (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sell, M. (2015). Generating a 3D training image with low-rank tensor completion: a multi-stage application. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile130491.pdf

Chicago Manual of Style (16^th Edition):

Sell, Maiko. “Generating a 3D training image with low-rank tensor completion: a multi-stage application.” 2015. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile130491.pdf.

MLA Handbook (7^th Edition):

Sell, Maiko. “Generating a 3D training image with low-rank tensor completion: a multi-stage application.” 2015. Web. 22 Jul 2019.

Vancouver:

Sell M. Generating a 3D training image with low-rank tensor completion: a multi-stage application. [Internet] [Masters thesis]. McGill University; 2015. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile130491.pdf.

Council of Science Editors:

Sell M. Generating a 3D training image with low-rank tensor completion: a multi-stage application. [Masters Thesis]. McGill University; 2015. Available from: http://digitool.library.mcgill.ca/thesisfile130491.pdf

McGill University

6. Hughes, Rory. Factors influencing overbreak in narrow vein longitudinal retreat mining.

Degree: M. Eng., Department of Mining and Materials, 2011, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile104894.pdf

► Limiting the amount of ore dilution prior to entering the process stream is the goal of any mining operation. Narrow vein longitudinal retreating mining methods… (more)

▼ Limiting the amount of ore dilution prior to entering the process stream is the goal of any mining operation. Narrow vein longitudinal retreating mining methods are especially susceptible to hanging wall and footwall dilution due to the wall overbreak. Understanding the factors which influence the stability of these walls can help a mining engineer design stopes that minimize dilution. This thesis presents the results of a study to examine these influential factors and reveals the process used to construct an empirical model capable of estimating dilution for a specific stope. This work is centered on a case study of Agnico Eagle Mines Ltd. Lapa mine located in Preissac, Quebec.Possessing a means to properly measure and quantify dilution is an essential part of this study. An in depth review of the various techniques is presented with the concept of Dilution Density being chosen as a means to quantify dilution. In order to determine which factors influence dilution, a review of existing literature, including modelling studies is undertaken. With careful review of the mining practice and geological environment, the most important of these factors are identified. One of these factors, stope strike length in narrow vein retreat mining, is not thoroughly explored by existing publications; and, in order to better understand this factor a numerical model is constructed.Before constructing this numerical model it is necessary to find an adequate means to organize and interpret the copious amounts of data retrieved from the mine site. Data such as geotechnical drill holes, stope reconciliation data, and stope construction details are integrated into a purpose-built geomechanical database. Named the "Data Integrator for Mine Analysis and Design (DIMAND)" the database software package provides easy access to important data and eases the construction of numerical models.In order to fully understand the influence of stope strike length on unplanned ore dilution, a numerical model is constructed. Due to the geometry of the problem, it is necessary to perform the analysis in three dimensions. The finite difference code FLAC3D is employed to construct a model based on rock mass properties and stope constructions present at Lapa mine. With strain softening behaviour common in rock masses and the Lapa rock mass being one regularly subjected to large strains, a strain-softening constitutive model is employed in the FLAC3D model. This model reveals that larger stope strike lengths are prone to generate larger volumes of dilution into a newly opened stope whereas shorter strike lengths are less prone to dilution. The model also explores the effects of a retreat sequence on overbreak; revealing that primary stopes are slightly more prone to overbreak than secondary stopes. These studies aided in the development of an empirical model that provides estimates for stope overbreak tonnages. The development of the empirical model is explored in detail from early models with small sample groups and simple mathematical… Advisors/Committee Members: Hani Mitri (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hughes, R. (2011). Factors influencing overbreak in narrow vein longitudinal retreat mining. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile104894.pdf

Chicago Manual of Style (16^th Edition):

Hughes, Rory. “Factors influencing overbreak in narrow vein longitudinal retreat mining.” 2011. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile104894.pdf.

MLA Handbook (7^th Edition):

Hughes, Rory. “Factors influencing overbreak in narrow vein longitudinal retreat mining.” 2011. Web. 22 Jul 2019.

Vancouver:

Hughes R. Factors influencing overbreak in narrow vein longitudinal retreat mining. [Internet] [Masters thesis]. McGill University; 2011. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile104894.pdf.

Council of Science Editors:

Hughes R. Factors influencing overbreak in narrow vein longitudinal retreat mining. [Masters Thesis]. McGill University; 2011. Available from: http://digitool.library.mcgill.ca/thesisfile104894.pdf

McGill University

7. Jin, Lei. The impact of water on heat distribution and mechanical properties of basalt after microwave treatment.

Degree: M. Eng., Department of Mining and Materials, 2015, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile130450.pdf

►

Every underground excavation technique has shortcomings (e.g., low productivity, high cost). Heating rocks with microwave energy before excavation can change their mechanical properties and reduce… (more)

▼

Every underground excavation technique has shortcomings (e.g., low productivity, high cost). Heating rocks with microwave energy before excavation can change their mechanical properties and reduce rock strength. Microwave-assisted rock fragmentation not only reduces equipment maintenance costs, but increases drilling penetration rates and productivity. Mineral processing can also benefit from the micro-fractures created by this promising novel technique. The effect of the presence of water during rock microwave heating of rocks is poorly understood and serves as the objective of this thesis. Temperature distributions and mechanical properties (abrasiveness and tensile strength) were measured in stacked basalt disks in saturated and dry conditions after microwave treatment at 2.45 GHz and 3 kW power for three exposure times (40, 60, and 80 s). Water did not affect heat distributions and mechanical properties of basalt after microwave heating. To test if this effect was due to the low porosity of basalt, a more porous sandstone was tested. Saturated specimens burst into fragments during microwave treatment. In addition, a sinusoidal temperature distribution pattern was observed if the basalt specimen size was similar to or larger than the microwave wavelength. Longer exposure times resulted in higher temperatures and larger basalt volumes exhibited a slower heating rate.Measured and simulated—using the finite element modelling package COMSOL Multiphysics®—heat distribution patterns were similar, though simulated temperatures were lower. Similar to experimental results, simulated dry and wet basalt temperatures did not differ after microwave heating. The reliability of this pilot numerical modeling study will facilitate future simulations of processes that are too complex to empirically measure.

Chaque méthode d'excavation a ses lacunes, tel qu'un manque de productivité ou un manque de compétitivité d'un point de vue économique. Chauffer la roche avec de l'énergie micro-onde est une technique prometteuse qui peut changer les propriétés mécaniques de la roche et réduire sa force. La fragmentation de roche assistée par micro-ondes réduit non seulement l'usure de l'équipement, mais augmente aussi la productivité et le taux de forage. Le traitement de minerais peut aussi bénéficier des micro-fractures créées par les micro-ondes. Par contre, le rôle de l'eau dans le réchauffement de la roche par micro-ondes n'est pas établi et est le sujet de cette thèse. La répartition de température et les propriétés mécaniques (index d'abrasivité CERCHAR, résistance à la traction) de piles de disques de basalte secs et saturés sont étudiées. Les piles de disques sont exposées aux micro-ondes ayant une fréquence de 2.45 GHz et une puissance de 3 kW pendant 40, 60, ou 80 seconds. Il est démontré que l'eau n'a pas d'impact sur les propriétés mécaniques et la répartition de température dans les disques de basalte après chauffage par micro-ondes. Par contre, l'effet de l'eau sur le chauffage par micro-ondes d'une roche plus poreuse (le…

Advisors/Committee Members: Faramarz P Hassani (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jin, L. (2015). The impact of water on heat distribution and mechanical properties of basalt after microwave treatment. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile130450.pdf

Chicago Manual of Style (16^th Edition):

Jin, Lei. “The impact of water on heat distribution and mechanical properties of basalt after microwave treatment.” 2015. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile130450.pdf.

MLA Handbook (7^th Edition):

Jin, Lei. “The impact of water on heat distribution and mechanical properties of basalt after microwave treatment.” 2015. Web. 22 Jul 2019.

Vancouver:

Jin L. The impact of water on heat distribution and mechanical properties of basalt after microwave treatment. [Internet] [Masters thesis]. McGill University; 2015. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile130450.pdf.

Council of Science Editors:

Jin L. The impact of water on heat distribution and mechanical properties of basalt after microwave treatment. [Masters Thesis]. McGill University; 2015. Available from: http://digitool.library.mcgill.ca/thesisfile130450.pdf

McGill University

8. Wei, Wei. Numerical modelling study of rock support system for deep mine haulage drift.

Degree: M. Eng., Department of Mining and Materials, 2010, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile95194.pdf

►

Haulage drifts are used for the transportation of blasted ore from the draw point to nearby ore pass or dumping point in sublevel mining systems.… (more)

▼

Haulage drifts are used for the transportation of blasted ore from the draw point to nearby ore pass or dumping point in sublevel mining systems. During production, haulage drifts are occupied by mine operators and haulage equipment. Therefore the stability of haulage drifts is important to the safe and uninterrupted production of a mining operation. It would be advantageous to know a priori how drift stability is influenced by mining activities in the proximity of the drift. This thesis presents the results of a study to examine drift stability and rock support system performance of a haulage drift, based on a case study of Garson mine from Vale Inco, Sudbury, Canada. The Mohr-Coulomb and Hoek-Brown models are the most widely used constitutive laws to describe the elastoplastic behaviour of rock materials under load. They are available in many numerical modeling codes including Phase2 and FLAC, which were selected to perform the numerical modeling analyses in this thesis. Consequently, the Mohr-Coulomb and Hoek-Brown constitutive models are reviewed in the first place. The finite element method is selected, together with Hoek-Brown model, to study the influencing factors of stability of haulage drift; finite difference method is chosen, along with Mohr-Coulomb model, to examine the performance of rock support system design. Much information is gathered from the mine site to help understand the entire mining environment. Parameters like rock mass character, mining plan and stress environment need to be known ahead of time in preparation for building the numerical model. Consequently, a geomechanical database named Data Integrator for Mine Analysis and Design (DIMAND), including the most important features related to mining activities, has been developed. Numerical modeling results reveal that there is a dominant trend of low stress regime (postpeak) in the drift back, which results from the stoping activities in both cases of low and high horizontal to ver

Dans les opérations de minage en vrac, le minerai est transporté des points de soutirages aux chûtes à minerai grâce aux galeries de halage. Ces galeries de halage sont utilisés par le personnel quotidiennement. Donc, la stabilité des galeries de halage est primordiale pour garantir une production constante et sécuritaire. Il serait avantageux de savoir a priori comment la galerie de halage sera affectée par l'activité minière avoisinante. Ce mémoire décrit les résultats d'une étude qui examine la stabilité et la performance du soutènement d'une galerie de halage de la mine Garson, Sudbury Ontarion, Canada, propriété de Vale. Les critères de Mohr-Coulomb et de Hoek-Brown sont les plus utilisés pour décrire le comportement du massif rocheux soumis à des contraintes. Les logiciels Phase 2 et FLAC ont été retenus pour compléter l'analyse numérique de ce travail, car les critères de Mohr-Coulomb et de Hoek-Brown y sont intégrés. Pour étudier les facteurs influençant la stabilité de la galerie de halage, un code avec éléments finis (Phase2) utilisant le…

Advisors/Committee Members: Hani Mitri (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wei, W. (2010). Numerical modelling study of rock support system for deep mine haulage drift. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile95194.pdf

Chicago Manual of Style (16^th Edition):

Wei, Wei. “Numerical modelling study of rock support system for deep mine haulage drift.” 2010. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile95194.pdf.

MLA Handbook (7^th Edition):

Wei, Wei. “Numerical modelling study of rock support system for deep mine haulage drift.” 2010. Web. 22 Jul 2019.

Vancouver:

Wei W. Numerical modelling study of rock support system for deep mine haulage drift. [Internet] [Masters thesis]. McGill University; 2010. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile95194.pdf.

Council of Science Editors:

Wei W. Numerical modelling study of rock support system for deep mine haulage drift. [Masters Thesis]. McGill University; 2010. Available from: http://digitool.library.mcgill.ca/thesisfile95194.pdf

McGill University

9. Emad, Muhammad Zaka. Dynamic performance of cemented rockfill under blast-induced vibrations.

Degree: PhD, Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile121473.pdf

►

In this thesis, a new methodology for the design of CRF under static and dynamic loading conditions is developed. First a comprehensive literature review of… (more)

▼

In this thesis, a new methodology for the design of CRF under static and dynamic loading conditions is developed. First a comprehensive literature review of the backfill material is accomplished which included a review of CRF operations and laboratory testing programs. This is followed by a review of numerical modelling studies performed on CRF. Based on the findings from literature review, two numerical models for CRF are developed using FLAC3D code. One of the models considers stopes to be inclined at about 67 degrees and the other considers vertical stopes. The numerical models are then used to study different aspects of CRF practice including the loading conditions, blast-induced vibrations from adjacent production stopes, vertical block mining method, CRF properties, CRF placement method and segregation. A case study mine CRF model is then constructed in accordance with site conditions and the geomechanical data provided by the mine. The case study mine numerical model is calibrated with in-situ stress measurements previously conducted at the case study mine. Mining and backfilling sequence is simulated with the calibrated model and the secondary stope is mined out in three lifts. In-situ blast vibration monitoring experiment in CRF is performed at the case study mine. Two geophones are installed: one inside CRF and the other on the surface of the CRF, and all three production blasts of the adjacent secondary stope are recorded. The detailed procedure, installation and results are presented in the thesis. The results are also used for numerical model calibration. To calculate damping coefficient for the model and blast load magnitude an equivalent cavity model is constructed. The equivalent cavity model is applied with reduced borehole pressure and the model is compared with charge-weight scaling law. The blast load and damping coefficients are extracted from equivalent cavity model and applied as input parameters for the CRF model. The numerical model is calibrated using blast load and damping coefficients obtained from the equivalent cavity model by computing the blast vibrations at a location similar to the one on site. The model is calibrated for all three blast lifts and results are presented. Finally, a CRF failure control study is carried out which encompasses the base case scenario of a planned stope at the case study mine, selective mining strategy for mining high grade ore, strategy of leaving an ore skin, tactically varying CRF properties vertically in CRF. In addition a parametric study is conducted to improve CRF stability by varying CRF properties and possible trends are presented. All results compare static loading versus blast loading scenario on CRF. The results include comparison of backfill stresses and profiles of peak particle velocity. Results of all analyses are presented along with the findings, conclusions, suggestions for future work and statement of contribution.

Dans cette thèse, une nouvelle méthodologie pour la conception de CRF sous des contraintes statiques et dynamiques est…

Advisors/Committee Members: Hani Mitri (Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Emad, M. Z. (2014). Dynamic performance of cemented rockfill under blast-induced vibrations. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile121473.pdf

Chicago Manual of Style (16^th Edition):

Emad, Muhammad Zaka. “Dynamic performance of cemented rockfill under blast-induced vibrations.” 2014. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile121473.pdf.

MLA Handbook (7^th Edition):

Emad, Muhammad Zaka. “Dynamic performance of cemented rockfill under blast-induced vibrations.” 2014. Web. 22 Jul 2019.

Vancouver:

Emad MZ. Dynamic performance of cemented rockfill under blast-induced vibrations. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile121473.pdf.

Council of Science Editors:

Emad MZ. Dynamic performance of cemented rockfill under blast-induced vibrations. [Doctoral Dissertation]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile121473.pdf

McGill University

10. Montiel Petro, Luis. On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems.

Degree: PhD, Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile127083.pdf

► Mining complexes are generally comprised of multiple deposits that contain several material types and grade elements, which are transformed in available processing destinations and transported… (more)

▼ Mining complexes are generally comprised of multiple deposits that contain several material types and grade elements, which are transformed in available processing destinations and transported to final stocks or ports as saleable products. These components, associated with a mining complex, encompass multiple sequential activities: (i) Mining the material from one or multiple sources; (ii) blending the material including stockpiling; (iii) transforming the material in different processing destinations considering operating modes; (iv) transporting the transformed material to final stocks or ports. Since these activities are strongly interrelated, their optimization must take place simultaneously. Conventional mining optimization methods suffer from at least one of the following drawbacks when optimizing mining complexes: some decisions are assumed when they should be dynamic (operating modes, destination of mining blocks, etc.); component based objectives are imposed, which might not coincide with global objectives; many parameters are assumed to be known when they are uncertain. Past research works have demonstrated that geological uncertainty is the main cause of the inability of meeting production targets in mining projects. This thesis presents methods to optimize mining complexes that simultaneously consider different components and account for geological uncertainty. A multistage methodology that uses simulated annealing algorithm to generate risk-based production schedules in mining complexes with multiple processing destinations is presented and implemented in Escondida Norte (Chile) copper dataset. Its implementation using Escondida Norte dataset generates expected average deviations of less than 5% regarding mill and waste targets, whereas a mine production schedule generated conventionally over a single estimated model generates expected average deviations of 20 and 12% for mill and waste targets respectively. An iterative improvement algorithm that considers operating modes at different processing destinations is developed and applied to a copper complex. The objective function seeks for maximizing discounted profits along the different periods and scenarios (orebody simulations). The implementation of the method at a copper deposit allows reducing the expected average deviations from 9 to 0.2% regarding the capacity of the first process while increasing the expected NPV by 30% when compared with an initial solution generated conventionally. A method that uses simulated annealing at different decision levels (mining, processing and transportation) is described and tested in a multipit copper operation. The implementation of the method in a multipit copper operation permits the reduction of the expected average deviations from the capacities at two mills from 18-22% to 1-3% and the expected average deviation from the targets regarding two blending elements from 7-1.8% to 0.3-0.6% when compared to an initial solution generated conventionally. The expected NPV also improves by 5%. The previous method is… Advisors/Committee Members: Roussos G Dimitrakopoulos (Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Montiel Petro, L. (2014). On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile127083.pdf

Chicago Manual of Style (16^th Edition):

Montiel Petro, Luis. “On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems.” 2014. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile127083.pdf.

MLA Handbook (7^th Edition):

Montiel Petro, Luis. “On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems.” 2014. Web. 22 Jul 2019.

Vancouver:

Montiel Petro L. On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile127083.pdf.

Council of Science Editors:

Montiel Petro L. On globally optimizing a mining complex under supply uncertainty: Integrating components from deposits to transportation systems. [Doctoral Dissertation]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile127083.pdf

McGill University

11. Goodfellow, Ryan. Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty.

Degree: PhD, Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile126902.pdf

► A mining complex is an integrated business that extracts materials from open pit or underground mines, treats extracted materials via a series of processing facilities… (more)

▼ A mining complex is an integrated business that extracts materials from open pit or underground mines, treats extracted materials via a series of processing facilities that are interconnected by various material handling methods, and generates a set of products that are sold and delivered to customers and/or the spot market. The primary objective when optimizing a mining complex is to maximize its value for the business and its stakeholders while obeying the technical constraints that limit production. This optimization is traditionally performed by treating the various components independently, leading to the suboptimal use of the natural resources and financial capital, and the underperformance of the mining complex. The global optimization of mining complexes aims to simultaneously optimize the mine production schedules, which define the distribution of materials over time, the destination policies, which define where extracted materials are sent, and the use of the various processing streams for processing, distribution and product marketing. As the size of the mining complex grows, there is a compounded effect that uncertainty has on the components, and new stochastic optimization methods are needed to manage this risk. This thesis aims to generate a unified modelling and global optimization methodology that integrates supply uncertainty and manages risk in the design and operation of mining complexes, and can be adapted to suit the needs and objectives of individual operations.This work advances the related field of knowledge through the development of new models and methods for optimizing mining complexes with uncertainty, which is achieved through five major contributions. First, a stochastic global optimization method is developed to simultaneously optimize multi-mine production schedules, destination policies, processing streams and capital expenditures for capacity design; while existing state-of-the-art methods may address some of these aspects, they have not been previously integrated in a simultaneous optimization model that does not rely on divvying up the global model into sub-problems. Second, a new, unified modelling approach is developed that permits the proposed methods to be tested on many different types of mining complexes with a high degree of modelling detail; as a result of this unified approach, non-linear relationships can easily be integrated in the optimization models - a limitation of existing deterministic and stochastic methods. Third, and a result of the previous development, a new approach is developed to model the economic value of the products sold, rather than the materials mined. Existing models and methods are limited by the assumption that each block has an economic value, hence the optimal processing stream is known a priori, and the block is treated and sold in isolation from other blocks; in some cases, this may lead to substantially undervaluing the resource. Using the new modelling approach, it is possible to evaluate the economic potential of products at the point of… Advisors/Committee Members: Roussos G Dimitrakopoulos (Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Goodfellow, R. (2014). Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile126902.pdf

Chicago Manual of Style (16^th Edition):

Goodfellow, Ryan. “Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty.” 2014. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile126902.pdf.

MLA Handbook (7^th Edition):

Goodfellow, Ryan. “Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty.” 2014. Web. 22 Jul 2019.

Vancouver:

Goodfellow R. Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile126902.pdf.

Council of Science Editors:

Goodfellow R. Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty. [Doctoral Dissertation]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile126902.pdf

12. Tan, Yue. Structure effect of alcohols and polyglycols on bubble rise velocity.

Degree: PhD, Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile123028.pdf

►

Frothers are commonly used in mineral flotation processes to reduce bubble size, slow bubble rise, and stabilize froth. Frother chemistry (structure) plays an important role… (more)

▼

Frothers are commonly used in mineral flotation processes to reduce bubble size, slow bubble rise, and stabilize froth. Frother chemistry (structure) plays an important role in determining these functions. In this thesis, over 50 surfactants (mainly from two frother families, alcohols and polyglycols) were investigated to determine the structure effect on bubble rise velocity. The structural variables were: alkyl chain length in alcohols and polyglycols, the number of propylene oxide (PO) and ethylene oxide (EO) groups in polyglycols and location of methyl branch and hydroxyl group in alcohols. The bubble rise velocity profile was determined over 350 cm in a water column. The concentration to reach minimum velocity at 300 cm (CMV) was estimated for each structure. A lower CMV means a structure is more effective in slowing bubble rise. The relationship between CMV and the structural variables and between CMV and HLB (hydrophile-lipophile balance) was investigated. Increasing alkyl chain length and number of PO or EO units decreases CMV. The hydroxyl group(s) at the terminal position is more effective in reducing CMV than the center position. The effect of methyl branch position is related to the position of the hydroxyl group (OH): The farther the methyl branch from the OH, the lower the CMV. The mechanism slowing bubble rise was related to surfactant surface activity and packing density and the consequent effect on surface tension gradient and surface viscosity. Linear relationships were found between log CMV and the structural variables and between log CMV and HLB that had a common slope for each surfactant family. Modified HLB group numbers to account for methyl branch and OH position in alcohols were derived in order to include the isomers in the relationship. Noting there were common trends between CMV and the critical coalescence concentration (CCC) linear log CCC vs. HLB relationships were shown using literature data. The mechanism apparently linking CMV and CCC is discussed. The CMV/HLB and CCC/HLB relationships are a step towards predicting frother functions from the structure.

Les mousses sont communément utilisées en flotattaison pour réduire la taille et la vitesse de la bulle et stabiliser la buse de flottaison. La chimie structurale de la buse de flottaison joue un rôle majeur dans la détermination de ces fonctions. Dans cette thèse, plus de 50 surfactants (principallement ceux appartenant aux familles d'alcools et de poly glycols ont été étudiés afin d'en determiner l'effet structural lors de la montée de la bulle. Les variables structurales considérées étaient: la longueur de la chaîne alkilée dans les alcools et poly glycols, le nombre de groupes d'oxyde de propylene (PO) et d'oxyde d'éthylène (EO), l'emplacement de la branche méthylique et celui du groupe hydroxylique dans les alcools. La vélocité de la bulle a été établie sur 350 cm dans la colonne d'eau. La concentration correspondant à la vélocité minimale à 300 cm (CMV) était évaluée pour chaque structure. Une…

Advisors/Committee Members: James A Finch (Supervisor).

Subjects/Keywords: Engineering - Mining

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tan, Y. (2014). Structure effect of alcohols and polyglycols on bubble rise velocity. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile123028.pdf

Chicago Manual of Style (16^th Edition):

Tan, Yue. “Structure effect of alcohols and polyglycols on bubble rise velocity.” 2014. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile123028.pdf.

MLA Handbook (7^th Edition):

Tan, Yue. “Structure effect of alcohols and polyglycols on bubble rise velocity.” 2014. Web. 22 Jul 2019.

Vancouver:

Tan Y. Structure effect of alcohols and polyglycols on bubble rise velocity. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile123028.pdf.

Council of Science Editors:

Tan Y. Structure effect of alcohols and polyglycols on bubble rise velocity. [Doctoral Dissertation]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile123028.pdf

McGill University

13. De Freitas Silva, Mario. Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling.

Degree: M. Eng., Department of Mining and Materials, 2014, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile130634.pdf

►

The optimization of open pit mine production scheduling (OPMPS) is an intricate process due to its size and uncertainty of key input parameters. Over the… (more)

▼

The optimization of open pit mine production scheduling (OPMPS) is an intricate process due to its size and uncertainty of key input parameters. Over the last decade, substantial effort has been made towards the development of new stochastic frameworks that incorporates uncertainty into the decision process. However, due to the intrinsic complexity of the mathematical programming formulation and the large size of mineral deposits, finding an exact solution for the OPMPS is likely intractable. In addition to that, modelling the joint spatial uncertainty of mineral deposits accounting for several correlated geological attributes, significantly increases the complexity of these stochastic frameworks. These observations motivate the development of new computationally efficient approaches for generating joint stochastic simulations of a deposit and for solving the OPMPS under geological uncertainty. This thesis considers both aspects in its two main parts.In the first part of this thesis, an efficient heuristic solution approach is applied and tested to the stochastic mine production scheduling of a relatively large gold mine containing about 120 thousand blocks and considering a set of fifteen geological scenarios generated stochastically. The stochastic integer programming (SIP) formulation addresses multiple processing streams and a 'grade' stockpile which adds flexibility to the specific operation by advancing the processing of highly valuable material. The solution approach tested herein, first generates an initial feasible solution by sequentially solving the stochastic OPMPS period by period and afterwards, a network flow algorithm is used to sequentially search for further improvements. In this network graph the nodes identify candidate blocks which might have their extraction either postponed or advanced, aiming for new schedule with higher values and lower risk. The results show that production schedules with low deviations from production expectations can be generated in a reasonable time for an actual mining environment.In the second part, an efficient joint simulation framework is demonstrated though an application to Vale's Puma deposit, a major nickel laterite asset in Brazil. To integrate the variability of the revolting profiles, their 'true' thicknesses are jointly simulated using min/max autocorrelation factor (MAF). The realizations serve as geological boundaries within which Ni, Co, Fe, SiO2, MgO and dry-tonnage factor (DTF) can be jointly simulated directly at block support scale. The final result is a set of equiprobable representations of the deposit that incorporates both grade and tonnage uncertainty. These simulations can be used to assess the uncertainty about key aspects of the project, such as strict control of the ore's quality that feeds the metallurgical plant. The framework explored takes advantage of the MAF and direct block simulation approaches which facilitate the joint simulation of large multi-element deposits.

Le problème d'optimisation de la production des mines à ciel ouvert…

Advisors/Committee Members: Roussos G Dimitrakopoulos (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

De Freitas Silva, M. (2014). Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile130634.pdf

Chicago Manual of Style (16^th Edition):

De Freitas Silva, Mario. “Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling.” 2014. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile130634.pdf.

MLA Handbook (7^th Edition):

De Freitas Silva, Mario. “Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling.” 2014. Web. 22 Jul 2019.

Vancouver:

De Freitas Silva M. Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling. [Internet] [Masters thesis]. McGill University; 2014. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile130634.pdf.

Council of Science Editors:

De Freitas Silva M. Application of efficient frameworks for joint simulation of multi-element mineral deposits and stochastic optimization of open pit mine production scheduling. [Masters Thesis]. McGill University; 2014. Available from: http://digitool.library.mcgill.ca/thesisfile130634.pdf

University of Zambia

14. Dembetembe, Gift G. Nchanga open pit fleet optimization for productivity improvement .

Degree: 2017, University of Zambia

URL: http://dspace.unza.zm:8080/xmlui/handle/123456789/4684

► Nchanga Open Pit (NOP) is facing a critical equipment planning decision after undertaking improvement projects at the processing plant namely Elevated Temperature Leaching, Heap Leaching… (more)

▼ Nchanga Open Pit (NOP) is facing a critical equipment planning decision after undertaking improvement projects at the processing plant namely Elevated Temperature Leaching, Heap Leaching and Cobalt/Copper separation. Elevated Temperature Leaching has resulted in 20% increase in the recovery of copper while cobalt/copper separation is anticipated to bring 77.5% increase in the value of the final product. The improvements at the processing plant have subsequently led to extension of life of mine to 4 years. As a result of the above, all upstream components of the value chain have to be harmonized with these improvements in order to maintain productivity at optimum level and curb loss of value. Currently, NOP is faced with a critical equipment planning decision where the current ore handling fleet has to be either re-capitalized or apportioned to exploit new mining areas. Therefore this study was undertaken in order to optimize the fleet in terms of both size and performance. In order to achieve the stated objective, production planning, fleet optimization and fleet management were reviewed and analyzed based on generic formulas, match factor theory, Overall Equipment Effectiveness (OEE) and queuing theory while analysis of fleet performance and simulation was done by using Talpac software. Results of study indicated that NOP needs to invest in machinery by either re-capitalizing the current fleet or resorting to a more cost effective fleet management approach. Fleet optimization at NOP had six interacting factors which have attributed to low fleet performance. These factors are low machine availability, low machine utilization, mismatch between loaders and truck fleet sizes, double handling of ore, costly dust suppression system and flawed maintenance system. Furthermore, based on fleet deterioration, assessment of fleet performance using OEE showed low Overall Equipment Effectiveness of 7.2% for shovels, 13.6% for large excavators and 17.6% for trucks against a score of 85%. The study has also established that the number of trucks needs to be increased from 15 to 28 if the current haulage system has to be maintained or alternatively use the conveyor belt system. However, to do this, a reliability and maintainability analysis has to be done which is beyond the scope of this study.

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dembetembe, G. G. (2017). Nchanga open pit fleet optimization for productivity improvement . (Thesis). University of Zambia. Retrieved from http://dspace.unza.zm:8080/xmlui/handle/123456789/4684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dembetembe, Gift G. “Nchanga open pit fleet optimization for productivity improvement .” 2017. Thesis, University of Zambia. Accessed July 22, 2019. http://dspace.unza.zm:8080/xmlui/handle/123456789/4684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dembetembe, Gift G. “Nchanga open pit fleet optimization for productivity improvement .” 2017. Web. 22 Jul 2019.

Vancouver:

Dembetembe GG. Nchanga open pit fleet optimization for productivity improvement . [Internet] [Thesis]. University of Zambia; 2017. [cited 2019 Jul 22]. Available from: http://dspace.unza.zm:8080/xmlui/handle/123456789/4684.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dembetembe GG. Nchanga open pit fleet optimization for productivity improvement . [Thesis]. University of Zambia; 2017. Available from: http://dspace.unza.zm:8080/xmlui/handle/123456789/4684

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

McGill University

15. Albor Consuegra, Francisco. Exploring stochastic optimization in open pit mine design.

Degree: M. Eng., Department of Mining and Materials Engineering, 2010, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile92379.pdf

►

Over recent years, new methods have been developed to integrate uncertainty into the optimization of life-of-mine (LOM) production planning. This thesis makes use of two… (more)

▼

Over recent years, new methods have been developed to integrate uncertainty into the optimization of life-of-mine (LOM) production planning. This thesis makes use of two stochastic optimization methods: simulated annealing (SA) and stochastic integer programming (SIP); which are implemented in the context of the requirements of mining applications through the use of stochastic simulation to model uncertainty. For the case of SA, the second chapter of the thesis documents the case of a copper deposit where ten simulated realizations are sufficient to provide stable LOM optimization results. In addition, the study shows that the selected true optimal pit limits are larger than the ones derived through conventional optimization. Stochastically optimized pit limits are found to be about 17% larger, in terms of total tonnage, than the conventional (deterministic) optimal pit limits. The difference adds one year of mining and approximately 10% of additional net present value (NPV) when compared to the NPV of conventional optimal pit limits and a production schedule generated stochastically with the same SA algorithm. In the third chapter of the thesis, the SIP based optimizer is used with the purpose of integrating uncertainty into the process of pushback design. Results show the sensitivity of the NPV to the design of starting and intermediate pushbacks, as well as the pushback design at the bottom of the pit. The new approach yielded an increment of ~30% in the NPV when compared to the conventional approach. The differences reported are due to the different scheduling patterns, the waste mining rate and an extension of the pit limits which yielded an extra ~5.5 thousand tonnes of metal.

Depuis quelques années, de nouvelles méthodes ont été développées pour intégrer l'incertitude dans l'optimisation de la planification de la production de la vie-de-mine i.e. life-of-mine (LOM). Cette thèse se sert de deux méthodes d'optimisation stochastique : recuit simulé (RS) et programmation en nombres entiers stochastique (SIP); les deux méthodes sont programmées dans le cadre des besoins des applications d'exploitation de la simulation stochastique et modélisation d'incertitude. Pour le cas de RS, le deuxième chapitre de la thèse décris le cas d'un dépôt de cuivre où dix réalisations simulées sont suffisantes pour fournir des résultats stables d'optimisation de LOM. En outre, l'étude prouve que les véritables limites optimales choisies de mine sont plus grandes que celles dérivées par l'optimisation conventionnelle. Des limites stochastiquement optimisées de mine s'avèrent environ 17% plus grandes, en termes de tonnage total, que les limites optimales (déterministes) conventionnelles de mine. La différence ajoute un an d'exploitation et approximativement 10% de valeur nette additionnel (NPV) une fois comparée au NPV des limites optimales conventionnelles de mine et une cédule de production produit stochastiquement avec le même algorithme de RS. Dans le troisième chapitre de la thèse, l'optimiseur basé sur SIP est utilisé en vue…

Advisors/Committee Members: Roussos G Dimitrakopoulos (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Albor Consuegra, F. (2010). Exploring stochastic optimization in open pit mine design. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile92379.pdf

Chicago Manual of Style (16^th Edition):

Albor Consuegra, Francisco. “Exploring stochastic optimization in open pit mine design.” 2010. Masters Thesis, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile92379.pdf.

MLA Handbook (7^th Edition):

Albor Consuegra, Francisco. “Exploring stochastic optimization in open pit mine design.” 2010. Web. 22 Jul 2019.

Vancouver:

Albor Consuegra F. Exploring stochastic optimization in open pit mine design. [Internet] [Masters thesis]. McGill University; 2010. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile92379.pdf.

Council of Science Editors:

Albor Consuegra F. Exploring stochastic optimization in open pit mine design. [Masters Thesis]. McGill University; 2010. Available from: http://digitool.library.mcgill.ca/thesisfile92379.pdf

McGill University

16. Alvarez Silva, Mayeli. Surface chemistry study on the pentlandite- serpentine system.

Degree: PhD, Department of Mining and Materials, 2011, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile97112.pdf

►

Interaction with MgO-minerals is one mechanism suspected to reduce selectivity in flotation of pentlandite from ultramafic ore. Understanding the surface chemistry of the minerals involved… (more)

▼

Interaction with MgO-minerals is one mechanism suspected to reduce selectivity in flotation of pentlandite from ultramafic ore. Understanding the surface chemistry of the minerals involved will lead to improved flotation conditions that maximize flotation selectivity. The first part of the thesis compares isoelectric point (i.e.p.) and point of zero charge (p.z.c.) determined using Mular-Roberts [M-R] titration technique of MgO-minerals chlorite, serpentine and talc. The M-R technique was unsuccessful with talc, attributed to Mg2+ acting as potential determining ion. For serpentine and chlorite, respectively, p.z.c. was pH 4.3 and 4.6 and i.e.p. pH 3.2 and <3. Dispersion index (DI) for chlorite suggested that aggregation/dispersion is controlled by both; serpentine remained dispersed, possibly due to hydration effects.The second part determines surface properties of pentlandite and serpentine isolated from an ultramafic ore. Zeta potential measurements were made on minerals alone and as mixtures with either indifferent electrolyte or supernatant derived from an ore suspension as background. Individual mineral results anticipated interaction due to electrostatic attraction. This was confirmed in the mixed mineral case, with Mg(OH)2 precipitate interaction as an additional factor. Scanning electron microscopy validated the findings.Aggregation/dispersion was determined by turbidimetry using a light scattering technique and optical microscopy. The effect of selected factors on aggregation/dispersion of pentlandite and serpentine was investigated by a design of experiment (DOE). Concentration of carboxymethyl cellulose, CMC, and the interaction between CMC and pH were the important factors. Contact angle measurements explored effects of several factors on pentlandite hydrophobicity and, using a DOE, small-scale flotation was used to investigate effects on pentlandite floatability. The pH was the most important factor, acidic pH increasing both hydrophobicity and floatability. Copper activation enhanced both properties, as well; magnesium affected hydrophobicity at alkaline pH, but it did not show significant effect on floatability; serpentine was detrimental to the process; and CMC was capable of partially restoring the hydrophobicity and floatability of pentlandite depressed with serpentine.

L'interaction de la pentlandite avec des minéraux d'oxide de magnésium (MgO-) est soupçonnée d'être à l'origine de la sélectivité réduite de la pentlandite dans les procédés de flottation de minerais ultrabasiques. Une meilleure compréhension de la chimie de surface des minéraux impliqués devrait mener à l'amélioration des conditions de flottation qui en maximisent la sélectivité. La première partie de la thèse compare le point isoélectrique (p.i.e) et le point de charge nulle (p.c.n), déterminés à l'aide de la technique de titrage Mular-Roberts [M-R], de minéraux d'oxide de magnésium tels que la chlorite, la serpentine et le talc. Dans le cas du talc, la technique M-R a échoué, probablement dû aux ions Mg2+ qui jouent le rôle…

Advisors/Committee Members: James A Finch (Internal/Supervisor).

Subjects/Keywords: Engineering - Mining

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alvarez Silva, M. (2011). Surface chemistry study on the pentlandite- serpentine system. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile97112.pdf

Chicago Manual of Style (16^th Edition):

Alvarez Silva, Mayeli. “Surface chemistry study on the pentlandite- serpentine system.” 2011. Doctoral Dissertation, McGill University. Accessed July 22, 2019. http://digitool.library.mcgill.ca/thesisfile97112.pdf.

MLA Handbook (7^th Edition):

Alvarez Silva, Mayeli. “Surface chemistry study on the pentlandite- serpentine system.” 2011. Web. 22 Jul 2019.

Vancouver:

Alvarez Silva M. Surface chemistry study on the pentlandite- serpentine system. [Internet] [Doctoral dissertation]. McGill University; 2011. [cited 2019 Jul 22]. Available from: http://digitool.library.mcgill.ca/thesisfile97112.pdf.

Council of Science Editors:

Alvarez Silva M. Surface chemistry study on the pentlandite- serpentine system. [Doctoral Dissertation]. McGill University; 2011. Available from: http://digitool.library.mcgill.ca/thesisfile97112.pdf

West Virginia University

17. Sindelar, Mark F. The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development.

Degree: MS, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/174

► Regulations, such as the MINER Act of 2006, require the installation of redundant and secondary communication systems to assure that contact can be established with… (more)

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sindelar, M. F. (2013). The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/174

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sindelar, Mark F. “The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development.” 2013. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/174.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sindelar, Mark F. “The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development.” 2013. Web. 22 Jul 2019.

Vancouver:

Sindelar MF. The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development. [Internet] [Thesis]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/174.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sindelar MF. The Integration of a Coal Mine Emergency Communication Network into Pre-Mine Planning and Development. [Thesis]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/174

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

18. Prassetyo, Simon H. The influence of interface friction and w/h ratio on the violence of coal specimen failure.

Degree: MS, Mining Engineering, 2011, West Virginia University

URL: https://researchrepository.wvu.edu/etd/2225

► Violent failures of coal pillars, known in practice as coal mine bumps, have long been a subject of investigation. Many field investigations have considered geological… (more)

▼ Violent failures of coal pillars, known in practice as coal mine bumps, have long been a subject of investigation. Many field investigations have considered geological conditions that create high stress in the pillar as the main causative factor leading to bumps. In recent years, stress and constraint have been shown to be necessary in producing coal burst.;This research investigated the influence of interface friction and w/h ratio on the violence of coal specimen failure. In satisfying this objective, three violent failure parameters such as peak SPL, core zone failure, and ultimate stress were used to assess the violence of failure. The degree of the violence were investigated at three different interface frictions (high: mu = 0.40, medium: mu = 0.22, and low: mu = 0.13) and six w/h ratios (w/h = 3, 4, 6, 8, 12, and 16). The specimens were axially loaded in a universal testing machine equipped with a microphone to record sound pressure waves for peak SPL calculation. The failed specimens were also photographed after the failure for the measurement of core zones.;The violence of coal specimen failure was found to decrease with increasing w/h ratio and decreasing interface friction. In terms of peak SPL and ultimate stress, the influence of interface friction in reducing the violence was more significant for coal specimens at high w/h ratios than it was at low w/h ratios.;The high peak SPL region ≥ 124 dB was shown to be the most reliable parameter for assessing the violence of coal specimen failure, while the application of core zone failure depends on w/h ratio. Violent failure was also found to be independent of high ultimate stress. Stress merely contributes to the failure of the specimen, but it is the interface friction that greatly influences the degree of the violence.;There are four friction zones on the top end-surface of a coal specimen that may indicate the variation of confinement within the specimen. By the increase of w/h ratio, the zone of confinement was found to increase. Moreover, at the same interface friction, the increase of the confinement may also reduce the violence of failure.;Keywords: Coal specimen, violent failure, interface friction, w/h ratio, coal mine bumps, core zone, confinement. Advisors/Committee Members: Syd S. Peng..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prassetyo, S. H. (2011). The influence of interface friction and w/h ratio on the violence of coal specimen failure. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/2225

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prassetyo, Simon H. “The influence of interface friction and w/h ratio on the violence of coal specimen failure.” 2011. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/2225.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prassetyo, Simon H. “The influence of interface friction and w/h ratio on the violence of coal specimen failure.” 2011. Web. 22 Jul 2019.

Vancouver:

Prassetyo SH. The influence of interface friction and w/h ratio on the violence of coal specimen failure. [Internet] [Thesis]. West Virginia University; 2011. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/2225.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prassetyo SH. The influence of interface friction and w/h ratio on the violence of coal specimen failure. [Thesis]. West Virginia University; 2011. Available from: https://researchrepository.wvu.edu/etd/2225

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

19. Du, Xinzhi. The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6.

Degree: PhD, Mining Engineering, 2010, West Virginia University

URL: https://researchrepository.wvu.edu/etd/3564

► The longwall mining method is a commonly used method of coal extraction that involves the complete removal of large, rectangular panels of coal. Since it… (more)

▼ The longwall mining method is a commonly used method of coal extraction that involves the complete removal of large, rectangular panels of coal. Since it causes subsidence through the overlying strata to the ground surface, the surface-and ground-water above the longwall panels may be affected and drained into the lower levels. The purpose of this study is to determine the effects of longwall mining subsidence on surface- and ground-water systems by using a groundwater flow model: Ground Water Vista (GWV).;To setup the GWV model, the Globe Information System software (ArcMap) was used to determine the geometry and boundary conditions of GWV model. AutoCAD software was used to draw local geological cross-sections and analyze geologic formations of overburden strata. The final and dynamic subsidence profiles were plotted to determine the surface strains during the water table fluctuation periods. The slug tests were used to determine hydraulic conductivities of overburden strata. The recharge rates and evaptranspiration rate were obtained from field tests as input parameters in the GWV models.;Subsidence monitoring monuments were installed across the longwall panels to measure the subsidence before, during and after the longwall face passed under them. Additionally, extensometers in three different borehole locations were installed to monitor the overburden strata movements.;For recording the water level fluctuation, three water wells were drilled down to the proposed deformation and fractured zones to monitor the different water level fluctuations throughout the mining period. These water elevation records were used to calibrate the groundwater flow models.;The hydraulic conductivity is a measure of the rock's ability to transmit water when subjected to a hydraulic gradient. It is an important quantitative parameter characterizing the flow of groundwater. Slug tests were performed to determine the rock hydraulic conductivity of pre- and post-mining conditions.;A GWV model was used to predict the water table contours for the periods of pre- and post-mining conditions. The field data from the three water wells were used to calibrate the model.;Based on the analysis of final subsidence, extensometer readings, water table fluctuations and numerical modelings, it was concluded that:;The water bearing zones of overburden strata occur at the bedding-plane openings between different rock types. The main water bearing zones in the study area occur in the lower and middle members of the Waynesburg Formation.;The water table drawdown contour lines after longwall mining showed that the maximum water table drawdown was 50 ft, which was at the edge of panel B5. In general, the water table drawdown was larger around the recovery room than the setup room. The water table drawdown was smaller over the streams than the other areas. The water table dropped about -5, -22, -28 and -41 ft for the W1, W2, W3 and W4 intermediate wells, respectively. The maximum influence distance of the post-subsidence water table drawdown in the northern… Advisors/Committee Members: Syd S. Peng..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Du, X. (2010). The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6. (Doctoral Dissertation). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/3564

Chicago Manual of Style (16^th Edition):

Du, Xinzhi. “The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6.” 2010. Doctoral Dissertation, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/3564.

MLA Handbook (7^th Edition):

Du, Xinzhi. “The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6.” 2010. Web. 22 Jul 2019.

Vancouver:

Du X. The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6. [Internet] [Doctoral dissertation]. West Virginia University; 2010. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/3564.

Council of Science Editors:

Du X. The Impacts of Longwall Mining on Groundwater Systems – A Case of Cumberland Mine Panels B5 and B6. [Doctoral Dissertation]. West Virginia University; 2010. Available from: https://researchrepository.wvu.edu/etd/3564

West Virginia University

20. Chen, Jinxiang. Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles.

Degree: MS, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/3384

► Subbituminous coal, a low rank of coal, is difficult-to-float using the conventional flotation process by a single frother such as MIBC and a single collector… (more)

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, J. (2013). Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/3384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Jinxiang. “Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles.” 2013. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/3384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Jinxiang. “Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles.” 2013. Web. 22 Jul 2019.

Vancouver:

Chen J. Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles. [Internet] [Thesis]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/3384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen J. Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles. [Thesis]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/3384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

21. Nolan, Timothy A. Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia.

Degree: MS, Mining Engineering, 2012, West Virginia University

URL: https://researchrepository.wvu.edu/etd/3337

► The broad objective of this research was to improve current mining practices and reduce negative environmental impact of surface coal mining in West Virginia (WV).… (more)

▼ The broad objective of this research was to improve current mining practices and reduce negative environmental impact of surface coal mining in West Virginia (WV). The specific objectives were to (i) build the production and cost models to determine if conventional surface mining unit operations such as drilling, blasting, digging, loading, and crushing can be replaced with one mining machine called a surface miner (SM), (ii) apply the analytical hierarchy process (AHP) to help select the optimal mining method, and (iii) determine the extent of which the SM would benefit surface coal mining in WV, particularly by reducing some of the negative environmental impacts associated with current extraction practices.;The entire production and cost models were developed in MS Excel. The design and the procedures used for achieving the objectives involved six interrelated modules. Module1 includes rock properties of sandstone, shale, which are the predominant overburden and interburden materials in WV, and sub-bituminous coal. Module #2 considers drilling and blasting operations. Module #3 includes digging and loading of overburden material. It specifically addresses mining equipment such as electric and hydraulic shovels and front-end wheel loaders. Interburden material also includes sandstone and shale, and the two unit operations involved are ripping and pushing by bulldozers and loading by hydraulic backhoe shovel. Module #4 covers coal extraction by hydraulic backhoe shovel and the crushing operation. Module #5 focuses on the SM, while Module #6 is used to conduct comparative analyses among all mining unit operations for overburden, interburden, and coal. The resulting production rates, ownership, and operating costs were also presented. The analytical hierarchy process (AHP) was used to help select the optimal mining method based on both qualitative and quantitative factors.;Based on the results of this research, application of SM would benefit coal extraction in surface mining operations in WV. The estimated cost of coal extraction is lower than with conventional mining methods, and the machine is able to work selectively with high separation accuracy. Thin seams of coal and overburden can be mined separately, thus preventing dilution with interburden material. Rising operating costs for the SM become an issue as the quantity of material being extracted increases and higher values of unconfined compressive strength are encountered. Cutting tools on the drum wear out faster and require more changes and, at a certain point, the SM becomes unfeasible because of the time and cost involved in changing cutting tools. A significant advantage of SM, where applicable, is the elimination of the negative environmental impacts associated with blasting. Advisors/Committee Members: Vladislav Kecojevic..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nolan, T. A. (2012). Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/3337

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nolan, Timothy A. “Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia.” 2012. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/3337.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nolan, Timothy A. “Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia.” 2012. Web. 22 Jul 2019.

Vancouver:

Nolan TA. Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia. [Internet] [Thesis]. West Virginia University; 2012. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/3337.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nolan TA. Production and Cost Assessment of a Potential Application of Surface Miners in Coal Mining in West Virginia. [Thesis]. West Virginia University; 2012. Available from: https://researchrepository.wvu.edu/etd/3337

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

22. Vukotic, Ivana M. Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model.

Degree: MS, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/176

► Rope shovels are used to dig and load material in surface mines. One of the main factors that influence the productivity and energy consumption of… (more)

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vukotic, I. M. (2013). Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/176

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vukotic, Ivana M. “Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model.” 2013. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/176.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vukotic, Ivana M. “Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model.” 2013. Web. 22 Jul 2019.

Vancouver:

Vukotic IM. Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model. [Internet] [Thesis]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/176.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vukotic IM. Evaluation of Rope Shovel Operators in Surface Coal Mining Using a Multi-Attribute Decision-Making Model. [Thesis]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/176

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

23. Cheng, Jianwei. Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas.

Degree: PhD, Mining Engineering, 2012, West Virginia University

URL: https://researchrepository.wvu.edu/etd/3611

► Mine gas explosion is one of the most feared hazards in the coal industry worldwide. More often one gas explosion related accident can cause the… (more)

▼ Mine gas explosion is one of the most feared hazards in the coal industry worldwide. More often one gas explosion related accident can cause the death of multiple coal miners. Since the beginning of coal mining, numerous mine workers have lost their lives as a result of gas explosions. Such occurrences have long been a major concern for mining engineers. Examination of two coal mine disasters (Sago mine and UBB mine) that have occurred in the U.S. in recent years reveals that all explosions originated from or around the sealed areas. Therefore, a good understanding of the atmospheric status in a sealed coal mine area is crucial in preventing and reducing accidents associated with mine combustible gases and also for planning and implementing a mine rescue strategy. Due to the lack of comprehensive research carried out so far in this area, this dissertation work seeks to contribute to understanding the behavior of a coal mine sealed volume and improving safety in coal mines. The following improvements have been made in this research:;• Important influential factors to control the mine atmospheric compositions has been investigated and analyzed. They are: (1) effect of the barometric pressure change; (2) effect of coal mine seals; and (3) categories of gases making up the sealed atmosphere and their changing characteristics.;• Based on the principle of mass conservation and the ideal gas law, a stepwise dynamic mathematical model that uses the control volume approach to simulate the sealed mine atmospheric gas species changes over time has been developed. All the above mentioned influential factors have been incorporated into the mathematical model.;• A modified Coward explosibility diagram method is proposed to analyze the explosive mine atmosphere. The improvements include: (1) expanding the original Coward diagram; (2) corrections of flammable limits; (3) redefining the nose limit for each combustible gas; (4) developing an equation to predict the excess amount of inert gas for each combustible gas; and (5) introducing the concept of explosibility Safety Factor (SF) which improves the Coward diagram's further applications.;In order to facilitate these researches findings and improvements, a new software program, CIMMAS (Comprehensive and Integrated Model for Mine Atmospheric Status), has been developed. The program is coded using an object-oriented programming (OOP) language, Visual Basic 6.0. It offers friendly graphical user interfaces with schematic views and allows users to reduce input works and understand the program outputs. Advisors/Committee Members: Yi Luo..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cheng, J. (2012). Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas. (Doctoral Dissertation). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/3611

Chicago Manual of Style (16^th Edition):

Cheng, Jianwei. “Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas.” 2012. Doctoral Dissertation, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/3611.

MLA Handbook (7^th Edition):

Cheng, Jianwei. “Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas.” 2012. Web. 22 Jul 2019.

Vancouver:

Cheng J. Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas. [Internet] [Doctoral dissertation]. West Virginia University; 2012. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/3611.

Council of Science Editors:

Cheng J. Comprehensive and Integrated Model for Atmospheric Status in Sealed Underground Mine Areas. [Doctoral Dissertation]. West Virginia University; 2012. Available from: https://researchrepository.wvu.edu/etd/3611

West Virginia University

24. Yang, Meng. Evaluation of ultrafine spiral concentrators for coal cleaning.

Degree: MS, Mining Engineering, 2010, West Virginia University

URL: https://researchrepository.wvu.edu/etd/2126

► Although froth flotation methods are the major processes being used in treating ultrafine coal in coal preparation plant, the processes might require large quantities of… (more)

▼ Although froth flotation methods are the major processes being used in treating ultrafine coal in coal preparation plant, the processes might require large quantities of frother and collectors. The usage of reagents not only might increase the operating costs, but also cause environment concerns. 4+3 short turns two-staged spiral concentrator has been developed, applied in ultrafine coal cleaning circuit, and operated at a lower flowrate than that of spiral used in fine coal cleaning circuit. Ultrafine spiral concentrator is a specific gravity-based separator. It might be gradually accepted in ultrafine coal cleaning circuit as an alternative to froth flotation methods in ultrafine coal cleaning circuit of coal preparation.;To evaluate the ultrafine spiral in-plant separation performance, in-plant coal samples are collected from an ultrafine coal cleaning circuit in a coal preparation plant processing medium volatile bituminous coal in West Virginia. Detailed wet particle sizing and float-sink analysis using Lithium Metatungstate heavy liquid, are conducted at various particle size intervals. The particle size effects on the separation performance of ultrafine spiral to produce clean coal, and clean coal+middlings products were are evaluated. The characteristic parameters for the performance distribution curves, include the values of probable error, Ep, specific gravity separation, SG50, and the coefficient of variation, CV are derived by curvefitting to in-plant separation performance data. Those parameters have the values of Ep∼0.47- 0.12, SG50∼2.1-1.5, and CV∼0.162-0.04 for clean coal, and Ep∼0.44-0.12, SG50∼2.50 -1.52, and CV∼0.24-0.15 for coal+middlings. A narrow size interval would be desired for optimum separating efficiency because the better separation occurred to the different particle size intervals with different operation conditions. This study also finds that the ash contents of spiral clean coal, and clean coal+middlings products are affected by the misplaced particles of plus 150mum and minus 45mum introduced by the inefficiency of ultrafine spiral feed classifying cyclone. To maintain the high quality of products, desliming the product using clean coal classifying cyclone becomes necessary to remove high clay particles in minus 45mum size interval. Advisors/Committee Members: Felicia Peng..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, M. (2010). Evaluation of ultrafine spiral concentrators for coal cleaning. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/2126

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Meng. “Evaluation of ultrafine spiral concentrators for coal cleaning.” 2010. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/2126.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Meng. “Evaluation of ultrafine spiral concentrators for coal cleaning.” 2010. Web. 22 Jul 2019.

Vancouver:

Yang M. Evaluation of ultrafine spiral concentrators for coal cleaning. [Internet] [Thesis]. West Virginia University; 2010. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/2126.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang M. Evaluation of ultrafine spiral concentrators for coal cleaning. [Thesis]. West Virginia University; 2010. Available from: https://researchrepository.wvu.edu/etd/2126

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

25. Verma, Priyesh. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.

Degree: MS, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/677

► Stability of the roof in an underground coalmine is imperative for safe and efficient mining. Mining of the coal seam disturbs the natural equilibrium of… (more)

▼ Stability of the roof in an underground coalmine is imperative for safe and efficient mining. Mining of the coal seam disturbs the natural equilibrium of the in-situ stresses in the surrounding rock. Because of the opening, the surrounding stratum deforms to fill the opening and return to the pre-mining stress state. Such deformation, if allowed to continue, will lead to failure of the strata, which creates an unsafe work environment. Therefore, supports are used to reinforce the deforming strata and help prevent any further deformation in the rock.;However, various mines have reported failures in the supported entries (MSHA, 2013). These failures have been mostly called as "cutter-failure" (Peng, 2008) and are attributed to high horizontal stresses; however, surprisingly, another factor which is suspected to have an effect on such failure is the time-dependent deformation. Its effect on the roof fall activity is unknown and to the authors knowledge limited research has been reported on this subject. Additionally, organizations such as the ISRM (International Society of Rock Mechanics) and the ASTM (American Society for Testing and Materials) have not recommended any creep testing procedure. Therefore, the objective of this research was to investigate the time-dependent deformational behavior of immediate coal measures rock (shale) and then use phenomenological equations to fit the experimental data and produce input properties for numerical modeling.;Creep, or time-dependent, experiments were performed on shale and sandstone specimens under constant load and stress conditions. Both rock types showed development of creep strain; however, the shale specimens were more sensitive to the change in the stress conditions. Under uniaxial stress conditions, the specimens showed an increase in the creep strain as the stress increased. In triaxial conditions, the creep strain increased with an increase in the deviatoric stress conditions. It is believed that this research will provide some preliminary information on the time-dependent behavior of shale. Advisors/Committee Members: Brijes Mishra, Keith A. Heasley, Yi Luo.

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Verma, P. (2013). An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/677

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Verma, Priyesh. “An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.” 2013. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/677.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Verma, Priyesh. “An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.” 2013. Web. 22 Jul 2019.

Vancouver:

Verma P. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. [Internet] [Thesis]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/677.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Verma P. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. [Thesis]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/677

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

26. Qiu, Biao. Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems.

Degree: PhD, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/178

► The stability of the underground mine openings largely depends on the surrounding ground conditions, such as stress concentrations, geological conditions and support intensities etc. In… (more)

▼ The stability of the underground mine openings largely depends on the surrounding ground conditions, such as stress concentrations, geological conditions and support intensities etc. In particular, the ground control stability associated with large movements and deformations of the strata is much more complicated and could induce much more severe safety problems. A ground control failure could endanger the coal miner's safety not only directly by roof, pillar, floor and/or rib failure, but also by ground cracks induced methane and water inundations indirectly. This study is aimed to develop comprehensive models to simulate the ground response to mining and solve the ground control problems associated with it.;During the last four decades, many research works have been conducted on the ground control study, and numerous models, including analytical, empirical, numerical and hybrid models, were developed to facilitate ground control and support design. If a model is to be used as a common mine design tool, the simplicity of the model itself and the consistency between actual in-mine and modeled ground response to mining are essential. For the study of the ground control stability associated with large movements and deformations, the key is to know the movements and deformations of the subsurface strata. The subsidence prediction models can determine the movements and deformations very accurately as proven by plenty of surface subsidence survey data. In this study, the subsidence prediction models are employed to analyze the stability of some subsidence related ground control problems based on the subsurface strata movements and deformations.;In this dissertation, an innovative approach, employing the influence function method while considering the hard rock layers, is applied in the development of an enhanced subsurface subsidence prediction model. This improved model is then applied in analyzing three specific subsidence related ground control problems. An analytical model, employing dynamic subsurface subsidence theory and considering the roof support interaction, is developed to analyze the stability of pre-driven longwall recovery room. The mechanism of the ground control stability problems as well as the potential safety problems associated with multi-seam mining interactions is discussed. Multi-seam mining subsidence prediction methods are re-examined based on the multi-seam mining interaction analysis. The redistribution of the stresses and strains in overburden is also able to affect the surface and subsurface water bodies in various degrees. Mathematical models are developed to link longwall induced overburden strata permeability change and subsurface deformations. A ground water flow model is used to assess the longwall mining impacts on surface and subsurface hydrological systems.;This study provides a greater understanding of the mechanism of the subsidence-related ground control problems. Innovative methods are developed to derive stress, strain and permeability change, and quantify the subsidence effects… Advisors/Committee Members: Yi Luo, Keith A. Heasley, Bruce Kang.

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Qiu, B. (2013). Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems. (Doctoral Dissertation). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/178

Chicago Manual of Style (16^th Edition):

Qiu, Biao. “Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems.” 2013. Doctoral Dissertation, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/178.

MLA Handbook (7^th Edition):

Qiu, Biao. “Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems.” 2013. Web. 22 Jul 2019.

Vancouver:

Qiu B. Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems. [Internet] [Doctoral dissertation]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/178.

Council of Science Editors:

Qiu B. Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems. [Doctoral Dissertation]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/178

West Virginia University

27. Sears, Morgan M. Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines.

Degree: PhD, Mining Engineering, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/676

► Stable underground mine openings are fundamental to ensuring the safety of miners and providing a safe work environment. During the past decade, approximately 40% of… (more)

▼ Stable underground mine openings are fundamental to ensuring the safety of miners and providing a safe work environment. During the past decade, approximately 40% of underground mining fatalities were caused by roof falls, rib collapses, or bumps/bursts, 19% of which occurred during retreat mining (Pappas and Mark, 2012). In addition, approximately 600 miners are non-fatally injured (often severely) every year by rock falls in coal mines (Pappas and Mark, 2012).;To help with designing stable mine pillars in deep-cover situations, a new calibration method for deep-cover pillar retreat mining was developed and implemented into the LaModel 3.0 program a few years ago (Heasley et al., 2010). This calibrated method was demonstrated to have very good results with a limited database of 47 deep-cover case histories, where a stability factor (SF) of 1.40 or above showed a 90% chance of success. During the development of the deep-cover calibration method for LaModel 3.0, there was nothing fundamental in the derivation that limited the method to only deep-cover mines; however, the method has not been specifically validated for shallow-cover mines.;This research work seeks to extend calibration of the LaModel program to shallow-cover mines. To perform this expansion, 40 shallow cover case histories from 12 different mines were obtained. The difficulty in finding shallow-cover failure cases for single seam mines necessitated creating a database which also included multiple-seam interactions. In general, with shallow cover, most mines were very successful, unless some type of multiple-seam stress became involved.;An initial analysis of the data showed two distinct failure populations, one comprised of inadequately sized pillars for global stability (mostly massive collapses) and one where local entry stability (massive roof falls or floor heave) was compromised by pillar stresses, weak roof/floor and/or multiple seam stresses. This distinction in failure mode required analyzing the database in two steps. First, an adequate pillar safety factor for global design stability was determined based on the pillar failure subset of the data. Then, once global stability was confirmed, the entry stability was analyzed separately to quantify the significance of parameters such as depth, coal mine roof rating (CMRR), entry stresses, etc. to the local stability of the entry.;Statistical analysis of the pillar failure subset of the data indicated that a SF of 2.0 or above resulted in an approximate 90% chance of maintaining global stability. Then, for the entry stability subset of the data, it was found that the CMRR and the multiple seam stress were most significant in predicting success or failure. With the addition of these two parameters, entry stability was able to be predicted with an approximate 75% accuracy.;Incorporating a shallow-cover, calibration technique into the LaModel program further enhances the most widely used boundary-element model to help develop stable pillar design at all depths. With the addition of this shallow-cover… Advisors/Committee Members: Keith A. Heasley, Christopher Bise, Yi Luo.

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sears, M. M. (2013). Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines. (Doctoral Dissertation). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/676

Chicago Manual of Style (16^th Edition):

Sears, Morgan M. “Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines.” 2013. Doctoral Dissertation, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/676.

MLA Handbook (7^th Edition):

Sears, Morgan M. “Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines.” 2013. Web. 22 Jul 2019.

Vancouver:

Sears MM. Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines. [Internet] [Doctoral dissertation]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/676.

Council of Science Editors:

Sears MM. Calibrating the LaModel Program for Shallow Cover Multiple-Seam Mines. [Doctoral Dissertation]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/676

West Virginia University

28. Bucks, Patrick R. A risk management approach to pillar extraction in the Central Appalachian coalfields.

Degree: MS, Mining Engineering, 2010, West Virginia University

URL: https://researchrepository.wvu.edu/etd/2158

► Central Appalachian coal reserves are a valuable natural resource in high demand, both domestically and internationally. The need for this resource necessitates recovery a high… (more)

▼ Central Appalachian coal reserves are a valuable natural resource in high demand, both domestically and internationally. The need for this resource necessitates recovery a high percentage of the coal reserves. The mining technique that is most often utilized to extract Central Appalachian coal at high recovery rates involves the development of entries and cross-cuts within the coal seam and the subsequent removal of the coal pillars that remain. The practice of extracting coal pillars is commonly referred to as pillaring or retreat mining.;The problem associated with pillar extraction is the additional safety risk posed to miners during pillar extraction. This thesis, will investigate the application of pillaring in Central Appalachia, and based on this investigation, develop a risk management-based strategy that targets personnel performance-based risk, in order to improve the ability of safety trainers to tailor training programs to the needs of pillaring sections.;Several conclusions have been determined in this thesis. Although pillaring has its roots in antiquated mining methods, current technology and mining practices have made this form of mining highly modernized. This modernization of the pillaring process has made great strides towards improving safety. However, current fatality trends suggest that work still needs to be done to control the residual risk that is not controlled by modern machinery and mining practices. Fatalities and accidents almost always have a personnel performance related component. These performances that have been identified in previous fatal accidents are still commonly observed in Central Appalachia. The risk management based strategy developed in this thesis can successfully identify and quantify risk associated with personnel performance. This ability to quantitatively assess performance based risk can have a significant impact on the ability of safety managers to train the workforce, and therefore, should have a positive impact on pillaring safety in Central Appalachia. Advisors/Committee Members: Christopher Bise..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bucks, P. R. (2010). A risk management approach to pillar extraction in the Central Appalachian coalfields. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/2158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bucks, Patrick R. “A risk management approach to pillar extraction in the Central Appalachian coalfields.” 2010. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/2158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bucks, Patrick R. “A risk management approach to pillar extraction in the Central Appalachian coalfields.” 2010. Web. 22 Jul 2019.

Vancouver:

Bucks PR. A risk management approach to pillar extraction in the Central Appalachian coalfields. [Internet] [Thesis]. West Virginia University; 2010. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/2158.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bucks PR. A risk management approach to pillar extraction in the Central Appalachian coalfields. [Thesis]. West Virginia University; 2010. Available from: https://researchrepository.wvu.edu/etd/2158

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

West Virginia University

29. Verma, Priyesh. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.

Degree: MS, 2013, West Virginia University

URL: https://researchrepository.wvu.edu/etd/8

► Stability of the roof in an underground coalmine is imperative for safe and efficient mining. Mining of the coal seam disturbs the natural equilibrium of… (more)

▼ Stability of the roof in an underground coalmine is imperative for safe and efficient mining. Mining of the coal seam disturbs the natural equilibrium of the in-situ stresses in the surrounding rock. Because of the opening, the surrounding stratum deforms to fill the opening and return to the pre-mining stress state. Such deformation, if allowed to continue, will lead to failure of the strata, which creates an unsafe work environment. Therefore, supports are used to reinforce the deforming strata and help prevent any further deformation in the rock.;However, various mines have reported failures in the supported entries (MSHA, 2013). These failures have been mostly called as "cutter-failure" (Peng, 2008) and are attributed to high horizontal stresses; however, surprisingly, another factor which is suspected to have an effect on such failure is the time-dependent deformation. Its effect on the roof fall activity is unknown and to the authors knowledge limited research has been reported on this subject. Additionally, organizations such as the ISRM (International Society of Rock Mechanics) and the ASTM (American Society for Testing and Materials) have not recommended any creep testing procedure. Therefore, the objective of this research was to investigate the time-dependent deformational behavior of immediate coal measures rock (shale) and then use phenomenological equations to fit the experimental data and produce input properties for numerical modeling.;Creep, or time-dependent, experiments were performed on shale and sandstone specimens under constant load and stress conditions. Both rock types showed development of creep strain; however, the shale specimens were more sensitive to the change in the stress conditions. Under uniaxial stress conditions, the specimens showed an increase in the creep strain as the stress increased. In triaxial conditions, the creep strain increased with an increase in the deviatoric stress conditions. It is believed that this research will provide some preliminary information on the time-dependent behavior of shale. Advisors/Committee Members: Brijes Mishra, Keith A. Heasley, Yi Luo..

Subjects/Keywords: Mining engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Verma, P. (2013). An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. (Thesis). West Virginia University. Retrieved from https://researchrepository.wvu.edu/etd/8

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Verma, Priyesh. “An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.” 2013. Thesis, West Virginia University. Accessed July 22, 2019. https://researchrepository.wvu.edu/etd/8.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Verma, Priyesh. “An experimental investigation of the creep behavior of an underground coalmine roof with shale formation.” 2013. Web. 22 Jul 2019.

Vancouver:

Verma P. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. [Internet] [Thesis]. West Virginia University; 2013. [cited 2019 Jul 22]. Available from: https://researchrepository.wvu.edu/etd/8.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Verma P. An experimental investigation of the creep behavior of an underground coalmine roof with shale formation. [Thesis]. West Virginia University; 2013. Available from: https://researchrepository.wvu.edu/etd/8

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan Technological University

30. Van Arsdale, Christopher Dawson. Selecting an electrical power source at the scoping level for a mining project.

Degree: MS, Department of Geological and Mining Engineering and Sciences, 2012, Michigan Technological University

URL: http://digitalcommons.mtu.edu/etds/542

► The electrical power source is a critical component of the scoping level study as the source affects both the project economics and timeline. This… (more)

Subjects/Keywords: Engineering; Mining Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Van Arsdale, C. D. (2012). Selecting an electrical power source at the scoping level for a mining project. (Masters Thesis). Michigan Technological University. Retrieved from http://digitalcommons.mtu.edu/etds/542

Chicago Manual of Style (16^th Edition):

Van Arsdale, Christopher Dawson. “Selecting an electrical power source at the scoping level for a mining project.” 2012. Masters Thesis, Michigan Technological University. Accessed July 22, 2019. http://digitalcommons.mtu.edu/etds/542.

MLA Handbook (7^th Edition):

Van Arsdale, Christopher Dawson. “Selecting an electrical power source at the scoping level for a mining project.” 2012. Web. 22 Jul 2019.

Vancouver:

Van Arsdale CD. Selecting an electrical power source at the scoping level for a mining project. [Internet] [Masters thesis]. Michigan Technological University; 2012. [cited 2019 Jul 22]. Available from: http://digitalcommons.mtu.edu/etds/542.

Council of Science Editors:

Van Arsdale CD. Selecting an electrical power source at the scoping level for a mining project. [Masters Thesis]. Michigan Technological University; 2012. Available from: http://digitalcommons.mtu.edu/etds/542

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations