subject:(Mining)

1. Perla, Cecilia. Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry.

Degree: PhD, Political Science, 2012, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:297720/

► As a result of global and domestic processes unleashed over the last thirty years, many global extractive companies have created special funds directed to contribute… (more)

▼ As a result of global and domestic processes unleashed over the last thirty years, many global extractive companies have created special funds directed to contribute to the social development of the populations living near their operations. These considerable funds are under the direct control of extractive companies and are showcased as part of the Corporate Social Responsibility (CSR) agenda promoted by the industry. Despite the potential positive developmental impacts they may have, the process of fund allocation is far from ‘politics-free’. In this dissertation I explore the distributional politics behind the allocation of extractive companies’ social funds on fence line populations. The empirical testing ground of this project is a controlled comparison of two large-scale mining companies operating in Peru, Southern Copper Corporation and Minera Barrick Misquichilca, which have two operations each: Toquepala, Cuajone, Pierina and Lagunas Norte. This research design allows for contrasts between companies – to explore the differences in corporate characteristics – and within companies – to investigate the diverse local configurations that companies encounter on the ground. Evidence from 14 months of fieldwork at these four mining localities suggests two broad conclusions. First, even though both companies have adopted a similar CSR rhetoric, their CSR practices on the ground differ substantially. To a large extent, the level and patterns of fund allocation respond to the institutionalization of processes that translate the ambiguous CSR rhetoric into daily routines. Second, despite the power of mining companies and the low organizational density of fence line populations, I find that local residents can influence the size and selection of social investments if they are able to adopt globally-relevant frames to make claims on companies. Through a framework that concentrates on the interactions between field company officials and local residents, I show the mismatch between CSR rhetoric and actual performance and document the new, powerful strategies that local residents can deploy to increase their leverage over large extractive companies. These findings support the analytical value of qualitative, field-based research to understand the encounters between extractive companies and local populations. Advisors/Committee Members: Luong Jones, Pauline (Director), Cammett, Melani (Reader), Heller, Patrick (Reader), Stallings, Barbara (Reader).

Subjects/Keywords: mining

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APA (6^th Edition):

Perla, C. (2012). Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:297720/

Chicago Manual of Style (16^th Edition):

Perla, Cecilia. “Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry.” 2012. Doctoral Dissertation, Brown University. Accessed February 18, 2020. https://repository.library.brown.edu/studio/item/bdr:297720/.

MLA Handbook (7^th Edition):

Perla, Cecilia. “Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry.” 2012. Web. 18 Feb 2020.

Vancouver:

Perla C. Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry. [Internet] [Doctoral dissertation]. Brown University; 2012. [cited 2020 Feb 18]. Available from: https://repository.library.brown.edu/studio/item/bdr:297720/.

Council of Science Editors:

Perla C. Extracting from the Extractors: The Politics of Private Welfare in the Peruvian Mining Industry. [Doctoral Dissertation]. Brown University; 2012. Available from: https://repository.library.brown.edu/studio/item/bdr:297720/

Cornell University

2. Haque, Asif-ul. Information And Social System Interaction .

Degree: 2011, Cornell University

URL: http://hdl.handle.net/1813/30752

► Ever increasing participation has made the interaction between information and social systems not only interesting to observe but essential to quantify and analyze. This dissertation… (more)

Subjects/Keywords: data mining; networks; text mining

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APA (6^th Edition):

Haque, A. (2011). Information And Social System Interaction . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/30752

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):

Haque, Asif-ul. “Information And Social System Interaction .” 2011. Thesis, Cornell University. Accessed February 18, 2020. http://hdl.handle.net/1813/30752.

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

MLA Handbook (7^th Edition):

Haque, Asif-ul. “Information And Social System Interaction .” 2011. Web. 18 Feb 2020.

Vancouver:

Haque A. Information And Social System Interaction . [Internet] [Thesis]. Cornell University; 2011. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/1813/30752.

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

Council of Science Editors:

Haque A. Information And Social System Interaction . [Thesis]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/30752

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

University of Zambia

3. Mwale, M. M. B. Small-scale mining in Zambia .

Degree: 2012, University of Zambia

URL: http://hdl.handle.net/123456789/1486

► The literature on the mineral deposits and small-scale mining activities in Zambia has been reviewed. The present state of the industry has been described with… (more)

Subjects/Keywords: Small scale mining; Mining-Zambia

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APA (6^th Edition):

Mwale, M. M. B. (2012). Small-scale mining in Zambia . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/1486

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):

Mwale, M M B. “Small-scale mining in Zambia .” 2012. Thesis, University of Zambia. Accessed February 18, 2020. http://hdl.handle.net/123456789/1486.

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

MLA Handbook (7^th Edition):

Mwale, M M B. “Small-scale mining in Zambia .” 2012. Web. 18 Feb 2020.

Vancouver:

Mwale MMB. Small-scale mining in Zambia . [Internet] [Thesis]. University of Zambia; 2012. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/123456789/1486.

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

Council of Science Editors:

Mwale MMB. Small-scale mining in Zambia . [Thesis]. University of Zambia; 2012. Available from: http://hdl.handle.net/123456789/1486

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

Queens University

4. Lamb, Carolyn. Detecting Deception in Interrogation Settings .

Degree: Computing, 2012, Queens University

URL: http://hdl.handle.net/1974/7695

► Bag-of-words deception detection systems outperform humans, but are still not always accurate enough to be useful. In interrogation settings, present models do not take into… (more)

Subjects/Keywords: Data Mining; Deception; Text Mining

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APA (6^th Edition):

Lamb, C. (2012). Detecting Deception in Interrogation Settings . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7695

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):

Lamb, Carolyn. “Detecting Deception in Interrogation Settings .” 2012. Thesis, Queens University. Accessed February 18, 2020. http://hdl.handle.net/1974/7695.

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

MLA Handbook (7^th Edition):

Lamb, Carolyn. “Detecting Deception in Interrogation Settings .” 2012. Web. 18 Feb 2020.

Vancouver:

Lamb C. Detecting Deception in Interrogation Settings . [Internet] [Thesis]. Queens University; 2012. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/1974/7695.

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

Council of Science Editors:

Lamb C. Detecting Deception in Interrogation Settings . [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7695

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

University of Georgia

5. Tarkhadkar, Sagar Santosh. Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature.

Degree: MS, Computer Science, 2013, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/tarkhadkar_sagar_s_201312_ms

► Manual curation of knowledge from biomedical literature is both expensive and time consuming. Scientific publications in biomedicine have an enormous amount of valuable information on… (more)

Subjects/Keywords: text mining

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

APA (6^th Edition):

Tarkhadkar, S. S. (2013). Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/tarkhadkar_sagar_s_201312_ms

Chicago Manual of Style (16^th Edition):

Tarkhadkar, Sagar Santosh. “Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature.” 2013. Masters Thesis, University of Georgia. Accessed February 18, 2020. http://purl.galileo.usg.edu/uga_etd/tarkhadkar_sagar_s_201312_ms.

MLA Handbook (7^th Edition):

Tarkhadkar, Sagar Santosh. “Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature.” 2013. Web. 18 Feb 2020.

Vancouver:

Tarkhadkar SS. Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature. [Internet] [Masters thesis]. University of Georgia; 2013. [cited 2020 Feb 18]. Available from: http://purl.galileo.usg.edu/uga_etd/tarkhadkar_sagar_s_201312_ms.

Council of Science Editors:

Tarkhadkar SS. Mutaimpact miner: a gene-mutation impact extractor and curator for biomedical literature. [Masters Thesis]. University of Georgia; 2013. Available from: http://purl.galileo.usg.edu/uga_etd/tarkhadkar_sagar_s_201312_ms

University of Georgia

6. Martin, Justin Randall. Prokinopub: a semantic search engine for protein kinase publications.

Degree: MS, Computer Science, 2011, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/martin_justin_r_201108_ms

► Searching through scientific articles for relevant information has proven to be a difficult and time-consuming task for researchers. Many improvements to the traditional, keyword-based search… (more)

Subjects/Keywords: text mining

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APA (6^th Edition):

Martin, J. R. (2011). Prokinopub: a semantic search engine for protein kinase publications. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/martin_justin_r_201108_ms

Chicago Manual of Style (16^th Edition):

Martin, Justin Randall. “Prokinopub: a semantic search engine for protein kinase publications.” 2011. Masters Thesis, University of Georgia. Accessed February 18, 2020. http://purl.galileo.usg.edu/uga_etd/martin_justin_r_201108_ms.

MLA Handbook (7^th Edition):

Martin, Justin Randall. “Prokinopub: a semantic search engine for protein kinase publications.” 2011. Web. 18 Feb 2020.

Vancouver:

Martin JR. Prokinopub: a semantic search engine for protein kinase publications. [Internet] [Masters thesis]. University of Georgia; 2011. [cited 2020 Feb 18]. Available from: http://purl.galileo.usg.edu/uga_etd/martin_justin_r_201108_ms.

Council of Science Editors:

Martin JR. Prokinopub: a semantic search engine for protein kinase publications. [Masters Thesis]. University of Georgia; 2011. Available from: http://purl.galileo.usg.edu/uga_etd/martin_justin_r_201108_ms

University of Georgia

7. Chakrabarti, Bhargabi. KiMIner: text mining : the impact of protein kinase mutations.

Degree: MS, Computer Science, 2015, University of Georgia

URL: http://purl.galileo.usg.edu/uga_etd/chakrabarti_bhargabi_201505_ms

► Each day, scientists publish numerous articles in the area of biology and biomedicine. In this thesis, we describe a text mining project on automatic extraction… (more)

Subjects/Keywords: text mining

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APA (6^th Edition):

Chakrabarti, B. (2015). KiMIner: text mining : the impact of protein kinase mutations. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/chakrabarti_bhargabi_201505_ms

Chicago Manual of Style (16^th Edition):

Chakrabarti, Bhargabi. “KiMIner: text mining : the impact of protein kinase mutations.” 2015. Masters Thesis, University of Georgia. Accessed February 18, 2020. http://purl.galileo.usg.edu/uga_etd/chakrabarti_bhargabi_201505_ms.

MLA Handbook (7^th Edition):

Chakrabarti, Bhargabi. “KiMIner: text mining : the impact of protein kinase mutations.” 2015. Web. 18 Feb 2020.

Vancouver:

Chakrabarti B. KiMIner: text mining : the impact of protein kinase mutations. [Internet] [Masters thesis]. University of Georgia; 2015. [cited 2020 Feb 18]. Available from: http://purl.galileo.usg.edu/uga_etd/chakrabarti_bhargabi_201505_ms.

Council of Science Editors:

Chakrabarti B. KiMIner: text mining : the impact of protein kinase mutations. [Masters Thesis]. University of Georgia; 2015. Available from: http://purl.galileo.usg.edu/uga_etd/chakrabarti_bhargabi_201505_ms

University of Hong Kong

8. Xu, Yong. Top-k SAS : on reliable retrieval of top-k tags.

Degree: M. Phil., 2017, University of Hong Kong

URL: http://hdl.handle.net/10722/244320

►

above method is quite challenging. To address this problem, we propose a learning-based method which applies machine learning models to estimate whether the k most… (more)

Subjects/Keywords: Data mining

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

APA (6^th Edition):

Xu, Y. (2017). Top-k SAS : on reliable retrieval of top-k tags. (Masters Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/244320

Chicago Manual of Style (16^th Edition):

Xu, Yong. “Top-k SAS : on reliable retrieval of top-k tags.” 2017. Masters Thesis, University of Hong Kong. Accessed February 18, 2020. http://hdl.handle.net/10722/244320.

MLA Handbook (7^th Edition):

Xu, Yong. “Top-k SAS : on reliable retrieval of top-k tags.” 2017. Web. 18 Feb 2020.

Vancouver:

Xu Y. Top-k SAS : on reliable retrieval of top-k tags. [Internet] [Masters thesis]. University of Hong Kong; 2017. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/10722/244320.

Council of Science Editors:

Xu Y. Top-k SAS : on reliable retrieval of top-k tags. [Masters Thesis]. University of Hong Kong; 2017. Available from: http://hdl.handle.net/10722/244320

Michigan Technological University

9. 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

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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 February 18, 2020. http://digitalcommons.mtu.edu/etd-restricted/146.

MLA Handbook (7^th Edition):

Smith, Jessica. “LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN.” 2012. Web. 18 Feb 2020.

Vancouver:

Smith J. LARGE SCALE LANDSLIDE ON THE ONTONAGON RIVER, MICHIGAN. [Internet] [Masters thesis]. Michigan Technological University; 2012. [cited 2020 Feb 18]. 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

University of Hong Kong

10. Wan, Chang. Mining multi-faceted data.

Degree: M. Phil., 2013, University of Hong Kong

URL: Wan, C. [萬暢]. (2013). Mining multi-faceted data. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5194751 ; http://dx.doi.org/10.5353/th_b5194751 ; http://hdl.handle.net/10722/197527

►

Multi-faceted data contains different types of objects and relationships between them. With rapid growth of web-based services, multi-faceted data are increasing (e.g. Flickr, Yago, IMDB),… (more)

▼

Multi-faceted data contains different types of objects and relationships between them. With rapid growth of web-based services, multi-faceted data are increasing (e.g. Flickr, Yago, IMDB), which offers us richer information to infer users’ preferences and provide them better services. In this study, we look at two types of multi-faceted data: social tagging system and heterogeneous information network and how to improve service such as resources retrieving and classification on them. In social tagging systems, resources such as images and videos are annotated with descriptive words called tags. It has been shown that tag-based resource searching and retrieval is much more effective than content-based retrieval. With the advances in mobile technology, many resources are also geo-tagged with location information. We observe that a traditional tag (word) can carry different semantics at different locations. We study how location information can be used to help distinguish the different semantics of a resource’s tags and thus to improve retrieval accuracy. Given a search query, we propose a location-partitioning method that partitions all locations into regions such that the user query carries distinguishing semantics in each region. Based on the identified regions, we utilize location information in estimating the ranking scores of resources for the given query. These ranking scores are learned using the Bayesian Personalized Ranking (BPR) framework. Two algorithms, namely, LTD and LPITF, which apply Tucker Decomposition and Pairwise Interaction Tensor Factorization, respectively for modeling the ranking score tensor are proposed. Through experiments on real datasets, we show that LTD and LPITF outperform other tag-based resource retrieval methods. A heterogeneous information network (HIN) is used to model objects of different types and their relationships. Meta-paths are sequences of object types. They are used to represent complex relationships between objects beyond what links in a homogeneous network capture. We study the problem of classifying objects in an HIN. We propose class-level meta-paths and study how they can be used to (1) build more accurate classifiers and (2) improve active learning in identifying objects for which training labels should be obtained. We show that class-level meta-paths and object classification exhibit interesting synergy. Our experimental results show that the use of class-level meta-paths results in very effective active learning and good classification performance in HINs.

published_or_final_version

Computer Science

Master

Master of Philosophy

Advisors/Committee Members: Cheung, DWL, Kao, CM.

Subjects/Keywords: Data mining

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APA (6^th Edition):

Wan, C. (2013). Mining multi-faceted data. (Masters Thesis). University of Hong Kong. Retrieved from Wan, C. [萬暢]. (2013). Mining multi-faceted data. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5194751 ; http://dx.doi.org/10.5353/th_b5194751 ; http://hdl.handle.net/10722/197527

Chicago Manual of Style (16^th Edition):

Wan, Chang. “Mining multi-faceted data.” 2013. Masters Thesis, University of Hong Kong. Accessed February 18, 2020. Wan, C. [萬暢]. (2013). Mining multi-faceted data. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5194751 ; http://dx.doi.org/10.5353/th_b5194751 ; http://hdl.handle.net/10722/197527.

MLA Handbook (7^th Edition):

Wan, Chang. “Mining multi-faceted data.” 2013. Web. 18 Feb 2020.

Vancouver:

Wan C. Mining multi-faceted data. [Internet] [Masters thesis]. University of Hong Kong; 2013. [cited 2020 Feb 18]. Available from: Wan, C. [萬暢]. (2013). Mining multi-faceted data. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5194751 ; http://dx.doi.org/10.5353/th_b5194751 ; http://hdl.handle.net/10722/197527.

Council of Science Editors:

Wan C. Mining multi-faceted data. [Masters Thesis]. University of Hong Kong; 2013. Available from: Wan, C. [萬暢]. (2013). Mining multi-faceted data. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5194751 ; http://dx.doi.org/10.5353/th_b5194751 ; http://hdl.handle.net/10722/197527

University of Edinburgh

11. Mezquita, Jose. The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama.

Degree: 2010, University of Edinburgh

URL: http://hdl.handle.net/1842/5226

► This dissertation explores the situations which have been taking place within Panama with regards to the emergence of a mining sector. A very controversial topic,… (more)

Subjects/Keywords: Mining; Panama

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APA (6^th Edition):

Mezquita, J. (2010). The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama. (Thesis). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/5226

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):

Mezquita, Jose. “The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama.” 2010. Thesis, University of Edinburgh. Accessed February 18, 2020. http://hdl.handle.net/1842/5226.

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

MLA Handbook (7^th Edition):

Mezquita, Jose. “The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama.” 2010. Web. 18 Feb 2020.

Vancouver:

Mezquita J. The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama. [Internet] [Thesis]. University of Edinburgh; 2010. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/1842/5226.

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

Council of Science Editors:

Mezquita J. The Social Impact of the Development of a Copper Mine on the Ngöbe Bugle Indigenous Community of Cerro Colorado in the Republic of Panama. [Thesis]. University of Edinburgh; 2010. Available from: http://hdl.handle.net/1842/5226

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

University of Zambia

12. Chipili, Evance E.M. Developing Small-Scale Mining in Malawi .

Degree: 2011, University of Zambia

URL: http://hdl.handle.net/123456789/605

► Malawi is endowed with a variety of mineral resources. Predominant among these are gemstones, industrial minerals, construction mineral materials and fuel minerals such as coal.… (more)

Subjects/Keywords: Mining (Malawi)

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APA (6^th Edition):

Chipili, E. E. M. (2011). Developing Small-Scale Mining in Malawi . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/605

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):

Chipili, Evance E M. “Developing Small-Scale Mining in Malawi .” 2011. Thesis, University of Zambia. Accessed February 18, 2020. http://hdl.handle.net/123456789/605.

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

MLA Handbook (7^th Edition):

Chipili, Evance E M. “Developing Small-Scale Mining in Malawi .” 2011. Web. 18 Feb 2020.

Vancouver:

Chipili EEM. Developing Small-Scale Mining in Malawi . [Internet] [Thesis]. University of Zambia; 2011. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/123456789/605.

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

Council of Science Editors:

Chipili EEM. Developing Small-Scale Mining in Malawi . [Thesis]. University of Zambia; 2011. Available from: http://hdl.handle.net/123456789/605

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

University of Saskatchewan

13. Khare, Nikisha Shally 1993-. COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/9523

► The practices of Canadian mining companies operating in Latin America, and the Canadian government’s role in supporting these practices, have been duly criticized for the… (more)

▼ The practices of Canadian mining companies operating in Latin America, and the Canadian government’s role in supporting these practices, have been duly criticized for the blatant social, environmental, and economic injustices created and perpetuated by transnational mining. The violation of human and Indigenous rights has elicited widespread resistance to mining from surrounding communities. A considerable amount of literature has explored the dynamics of this anti-mining activism, with most articles exploring a particular case study or feature of a few cases. However, a region-wide systematic synthesis of qualitative themes on the topic has not been found. Given the extent and nature of Canadian mining companies operating Latin America, the purpose of this project was to scope the published literature to characterize the nature of community resistance to Canadian transnational mining in Latin America. A scoping review method was employed to systematically search the literature, select studies for inclusion, chart qualitative data, and synthesize the literature reviewed. After screening, 61 articles discussing a total of 26 conflicts were included in this review. Conflicts in several Latin American countries with various Canadian mining companies were represented in this literature. In 69 percent of conflicts, the literature explicitly states the involvement of Indigenous groups in anti-mining resistance. Seventy-three percent of communities in the 26 conflicts were involved in agricultural livelihood activities. Sixty-five percent of conflicts occurred during the exploration stages of mining with all but one of these communities expressing complete rejections of mining, while 27 percent of conflicts occurred during the exploitation stages of mining with all of these communities seeking to change the conditions under which mining occurred. Communities had several interrelated concerns about mining that motivated their resistance, and used a variety of tactics to enact their activism. Furthermore, only five of 61 articles discussed at length the gendered dimensions of resistance, providing insights into gendered adversities, narratives, and tactics of resistance, and revealing a need for a gendered lens in the study of anti-mining movements. The literature reveals promising and important insights as well as clear gaps in research on the complexity and nuances of anti-mining movements in Latin America. Advisors/Committee Members: Hanson, Lori, Bharadwaj, Lalita, McKenzie, Marcia, Fowler-Kerry, Susan, Jones, Steven.

Subjects/Keywords: activism; mining

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APA (6^th Edition):

Khare, N. S. 1. (2018). COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/9523

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):

Khare, Nikisha Shally 1993-. “COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA.” 2018. Thesis, University of Saskatchewan. Accessed February 18, 2020. http://hdl.handle.net/10388/9523.

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

MLA Handbook (7^th Edition):

Khare, Nikisha Shally 1993-. “COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA.” 2018. Web. 18 Feb 2020.

Vancouver:

Khare NS1. COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2020 Feb 18]. Available from: http://hdl.handle.net/10388/9523.

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

Council of Science Editors:

Khare NS1. COMMUNITY RESISTANCE TO CANADIAN TRANSNATIONAL MINING OPERATIONS IN LATIN AMERICA. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/9523

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

McGill University

14. 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

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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 February 18, 2020. 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. 18 Feb 2020.

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 2020 Feb 18]. 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

15. Brissenden, William Guy. A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – .

Degree: Master of Engineering., Department of Mining., 1938, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile131554.pdf

► The problem of fine grinding is that problem connected with the reduction of a rock material to a size such that the valuable mineral it… (more)

Subjects/Keywords: Mining.

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APA (6^th Edition):

Brissenden, W. G. (1938). A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – . (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile131554.pdf

Chicago Manual of Style (16^th Edition):

Brissenden, William Guy. “A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – .” 1938. Masters Thesis, McGill University. Accessed February 18, 2020. http://digitool.library.mcgill.ca/thesisfile131554.pdf.

MLA Handbook (7^th Edition):

Brissenden, William Guy. “A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – .” 1938. Web. 18 Feb 2020.

Vancouver:

Brissenden WG. A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – . [Internet] [Masters thesis]. McGill University; 1938. [cited 2020 Feb 18]. Available from: http://digitool.library.mcgill.ca/thesisfile131554.pdf.

Council of Science Editors:

Brissenden WG. A study of certain phases of fine grinding. : (Part of an extended investigation being carried out at McGill University). – . [Masters Thesis]. McGill University; 1938. Available from: http://digitool.library.mcgill.ca/thesisfile131554.pdf

McGill University

16. O’Shaughnessy, Martin Daniel. Phases of fine grinding.

Degree: Master of Engineering., Department of Mining., 1938, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile132210.pdf

► In this investigation an attempt was made to discover the effect on grinding efficiency of increasing circulating loads. The experiments werecarried out in a 3… (more)

Subjects/Keywords: Mining

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APA (6^th Edition):

O’Shaughnessy, M. D. (1938). Phases of fine grinding. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile132210.pdf

Chicago Manual of Style (16^th Edition):

O’Shaughnessy, Martin Daniel. “Phases of fine grinding.” 1938. Masters Thesis, McGill University. Accessed February 18, 2020. http://digitool.library.mcgill.ca/thesisfile132210.pdf.

MLA Handbook (7^th Edition):

O’Shaughnessy, Martin Daniel. “Phases of fine grinding.” 1938. Web. 18 Feb 2020.

Vancouver:

O’Shaughnessy MD. Phases of fine grinding. [Internet] [Masters thesis]. McGill University; 1938. [cited 2020 Feb 18]. Available from: http://digitool.library.mcgill.ca/thesisfile132210.pdf.

Council of Science Editors:

O’Shaughnessy MD. Phases of fine grinding. [Masters Thesis]. McGill University; 1938. Available from: http://digitool.library.mcgill.ca/thesisfile132210.pdf

University of Manchester

17. Childs, John. Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?.

Degree: 2012, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:145211

► Alongside exponential rises in global prices for gold, there has been a concurrent rise in the geographical scope of the artisanal and small-scale mining (ASM)… (more)

▼ Alongside exponential rises in global prices for gold, there has been a concurrent rise in the geographical scope of the artisanal and small-scale mining (ASM) sector. This poverty-driven activity has been associated with elevated levels of environmental degradation, a high degree of informality, poor health and safety practices and below market prices for their gold. Despite these putatively conceived problems, there has been a historical and widespread failure by policy makers to significantly improve thesocio-economic and environmental conditions facing ASM’s operators. Recently, however, there has been a noticeable shift in the ways in which the governance of the sector is enacted. This thesis critically analyses the emergence of one such example, namely the Fairtrade Labelling Organistion and the Alliance for Responsible Mining’s dual launch of ‘Fairtrade’ and ‘Fairmined’ (FT/FM) certified gold. Inspired by the past successes for the movement in a range of agrifood products and grounded in the discourse of ‘fairness’, its application to ASM promises better prices in exchange for the fulfilment of standards relating to environmental stewardship,a commitment to democratic structures and responsible mining practices. Following the experiences of Fairtrade gold in nine pilot projects in Latin America, its expansion into gold producing countries in sub-Saharan African countries seems inevitable. However, there has been a lack of academic research into its efficacy, a gap that this thesis fills by examining the potential of both the discursive and material ways that Fairtrade and Fairmined gold may operate in Tanzania. It is revealed that ASM operators are negatively represented by conventional thinking as variously criminal, irresponsible and irrational. Against this background, it is argued that the intervention of FT/FM gold can be read through an environmental and social justice framework, one that presents a counter-narrative of ASM as a valued livelihood strategy marked by environmental responsibility. The struggles for greater recognition and more equitable distribution for ASM operators are premised, most critically on a movetowards a new, ‘fair’ way of mining. Building upon a critical examination of the politics of these discursiveconstructs, the thesis presents a critical examination of ‘fairness’ in practice through a case study. Indeed, a private company, African Precious Metals (APM), has constructed four ‘Fair Trade Gold Centres’ that offer ASM operators in the Mwanza and Shinyanga regions of Tanzania a new means of selling gold. Ideologically separate to the FT/FM model outlined above, their presence in local marketing arrangements for ASM gold has served to obscure the way that ‘fairness’ is conceptualised by ASM operators in the area. Moreover, their substantive failure in policy terms, allied to their close rhetorical association with FT/FM, has served to damage the moral ballast of ‘fairness’ found in the ‘Fairtrade’ gold discourse.Through the critical analysis of life histories narrated by ASM… Advisors/Committee Members: Chimhowu, Admos.

Subjects/Keywords: Fairtrade; Mining

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APA (6^th Edition):

Childs, J. (2012). Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:145211

Chicago Manual of Style (16^th Edition):

Childs, John. “Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?.” 2012. Doctoral Dissertation, University of Manchester. Accessed February 18, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:145211.

MLA Handbook (7^th Edition):

Childs, John. “Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?.” 2012. Web. 18 Feb 2020.

Vancouver:

Childs J. Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2020 Feb 18]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:145211.

Council of Science Editors:

Childs J. Fair Trade Gold: A New Way of Governing Artisanal and Small-Scale Mining in Tanzania?. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:145211

McGill University

18. 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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Sell M. Generating a 3D training image with low-rank tensor completion: a multi-stage application. [Internet] [Masters thesis]. McGill University; 2015. [cited 2020 Feb 18]. 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

19. Hicks, H. Brodie. A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing.

Degree: Master of Engineering., Department of Mining., 1935, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile134162.pdf

► A review of modern progress in mining and metallurgical operations reveals no factor more significant than the steady reduction in the cost of concentrating and… (more)

Subjects/Keywords: Mining.

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APA (6^th Edition):

Hicks, H. B. (1935). A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile134162.pdf

Chicago Manual of Style (16^th Edition):

Hicks, H Brodie. “A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing.” 1935. Masters Thesis, McGill University. Accessed February 18, 2020. http://digitool.library.mcgill.ca/thesisfile134162.pdf.

MLA Handbook (7^th Edition):

Hicks, H Brodie. “A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing.” 1935. Web. 18 Feb 2020.

Vancouver:

Hicks HB. A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing. [Internet] [Masters thesis]. McGill University; 1935. [cited 2020 Feb 18]. Available from: http://digitool.library.mcgill.ca/thesisfile134162.pdf.

Council of Science Editors:

Hicks HB. A photoelectric methods of measuring the surface of small particles with particular regard to its application to the problems of ore-dressing. [Masters Thesis]. McGill University; 1935. Available from: http://digitool.library.mcgill.ca/thesisfile134162.pdf

McGill University

20. 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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Hughes R. Factors influencing overbreak in narrow vein longitudinal retreat mining. [Internet] [Masters thesis]. McGill University; 2011. [cited 2020 Feb 18]. 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

21. 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

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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 February 18, 2020. 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. 18 Feb 2020.

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 2020 Feb 18]. 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

22. Jin, Ning. Heat pipe cooled injection lances : experimenal investigation and mathematical modeling.

Degree: PhD, Dept. of Mining and Metallurgical Engineering, 1997, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile147431.pdf

►

Note:

Heat pipes have been investigated, developed and applied in many industrial fields since their inception in 1964. However, the area of heat pipe technology… (more)

Subjects/Keywords: Mining

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APA (6^th Edition):

Jin, N. (1997). Heat pipe cooled injection lances : experimenal investigation and mathematical modeling. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile147431.pdf

Chicago Manual of Style (16^th Edition):

Jin, Ning. “Heat pipe cooled injection lances : experimenal investigation and mathematical modeling.” 1997. Doctoral Dissertation, McGill University. Accessed February 18, 2020. http://digitool.library.mcgill.ca/thesisfile147431.pdf.

MLA Handbook (7^th Edition):

Jin, Ning. “Heat pipe cooled injection lances : experimenal investigation and mathematical modeling.” 1997. Web. 18 Feb 2020.

Vancouver:

Jin N. Heat pipe cooled injection lances : experimenal investigation and mathematical modeling. [Internet] [Doctoral dissertation]. McGill University; 1997. [cited 2020 Feb 18]. Available from: http://digitool.library.mcgill.ca/thesisfile147431.pdf.

Council of Science Editors:

Jin N. Heat pipe cooled injection lances : experimenal investigation and mathematical modeling. [Doctoral Dissertation]. McGill University; 1997. Available from: http://digitool.library.mcgill.ca/thesisfile147431.pdf

McGill University

23. 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

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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)

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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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Wei W. Numerical modelling study of rock support system for deep mine haulage drift. [Internet] [Masters thesis]. McGill University; 2010. [cited 2020 Feb 18]. 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

24. 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)

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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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Emad MZ. Dynamic performance of cemented rockfill under blast-induced vibrations. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2020 Feb 18]. 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

25. 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

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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 February 18, 2020. 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. 18 Feb 2020.

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 2020 Feb 18]. 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

26. 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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Goodfellow R. Unifed modelling and simultaneous optimization of open pit mining complexes with supply uncertainty. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2020 Feb 18]. 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

27. 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

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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)

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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…

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Tan Y. Structure effect of alcohols and polyglycols on bubble rise velocity. [Internet] [Doctoral dissertation]. McGill University; 2014. [cited 2020 Feb 18]. 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

28. 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)

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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

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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 February 18, 2020. 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. 18 Feb 2020.

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 2020 Feb 18]. 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

Queensland University of Technology

29. Shen, Yan. Personalized ontology learning for enhancing text mining effectiveness.

Degree: 2013, Queensland University of Technology

URL: https://eprints.qut.edu.au/63699/

► Over the last decade, the majority of existing search techniques is either keyword- based or category-based, resulting in unsatisfactory effectiveness. Meanwhile, studies have illustrated that… (more)

▼ Over the last decade, the majority of existing search techniques is either keyword- based or category-based, resulting in unsatisfactory effectiveness. Meanwhile, studies have illustrated that more than 80% of users preferred personalized search results. As a result, many studies paid a great deal of efforts (referred to as col- laborative filtering) investigating on personalized notions for enhancing retrieval performance. One of the fundamental yet most challenging steps is to capture precise user information needs. Most Web users are inexperienced or lack the capability to express their needs properly, whereas the existent retrieval systems are highly sensitive to vocabulary. Researchers have increasingly proposed the utilization of ontology-based tech- niques to improve current mining approaches. The related techniques are not only able to refine search intentions among specific generic domains, but also to access new knowledge by tracking semantic relations. In recent years, some researchers have attempted to build ontological user profiles according to discovered user background knowledge. The knowledge is considered to be both global and lo- cal analyses, which aim to produce tailored ontologies by a group of concepts. However, a key problem here that has not been addressed is: how to accurately match diverse local information to universal global knowledge. This research conducts a theoretical study on the use of personalized ontolo- gies to enhance text mining performance. The objective is to understand user information needs by a \bag-of-concepts" rather than \words". The concepts are gathered from a general world knowledge base named the Library of Congress Subject Headings. To return desirable search results, a novel ontology-based mining approach is introduced to discover accurate search intentions and learn personalized ontologies as user profiles. The approach can not only pinpoint users' individual intentions in a rough hierarchical structure, but can also in- terpret their needs by a set of acknowledged concepts. Along with global and local analyses, another solid concept matching approach is carried out to address about the mismatch between local information and world knowledge. Relevance features produced by the Relevance Feature Discovery model, are determined as representatives of local information. These features have been proven as the best alternative for user queries to avoid ambiguity and consistently outperform the features extracted by other filtering models. The two attempt-to-proposed ap- proaches are both evaluated by a scientific evaluation with the standard Reuters Corpus Volume 1 testing set. A comprehensive comparison is made with a num- ber of the state-of-the art baseline models, including TF-IDF, Rocchio, Okapi BM25, the deploying Pattern Taxonomy Model, and an ontology-based model. The gathered results indicate that the top precision can be improved remarkably with the proposed ontology mining approach, where the matching approach is successful and achieves…

Subjects/Keywords: text mining

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

APA (6^th Edition):

Shen, Y. (2013). Personalized ontology learning for enhancing text mining effectiveness. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/63699/

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):

Shen, Yan. “Personalized ontology learning for enhancing text mining effectiveness.” 2013. Thesis, Queensland University of Technology. Accessed February 18, 2020. https://eprints.qut.edu.au/63699/.

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

MLA Handbook (7^th Edition):

Shen, Yan. “Personalized ontology learning for enhancing text mining effectiveness.” 2013. Web. 18 Feb 2020.

Vancouver:

Shen Y. Personalized ontology learning for enhancing text mining effectiveness. [Internet] [Thesis]. Queensland University of Technology; 2013. [cited 2020 Feb 18]. Available from: https://eprints.qut.edu.au/63699/.

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

Council of Science Editors:

Shen Y. Personalized ontology learning for enhancing text mining effectiveness. [Thesis]. Queensland University of Technology; 2013. Available from: https://eprints.qut.edu.au/63699/

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

University of Zambia

30. 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

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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 February 18, 2020. 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. 18 Feb 2020.

Vancouver:

Dembetembe GG. Nchanga open pit fleet optimization for productivity improvement . [Internet] [Thesis]. University of Zambia; 2017. [cited 2020 Feb 18]. 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

Open Access Theses and Dissertations