Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Ore grade"”.
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The energy analysis of burner reactor power systems
… from different sources is studied in detail. For ores, an important inverse relationship between energy use and ore grade is investigated and quantified. The physical limit at which the energy input to the system is equal to its output is shown to correspond to an average grade of 15 parts per …
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Fractal relationships and spatial distribution of ore body modelling
… distributions of geological variables such as ore grades is of primary concern when modelling ore bodies and mineral resources. The aim of any mineral resource evaluation process is to determine the location, extent, volume and average grade of that resource by a trade off between maximum …
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Resource intensity trends of ferrochrome production in South Africa
South Africa owns more than 70% of the world's known chromite reserves. Chromite has historically been the most feasible source of chromium suitable for ferrochrome production, which in turn is an essential raw material for stainless steel production. Stainless steel has a myriad of applications in …
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Simulation based micro-founded structural market analysis : a case study of the copper industry
… tracking, which allows the modeler to extract ore grade information as a function of consumption and reserve size. Thirdly, it models the supply side on an agent-based basis, allowing for aggregation of granular information, capturing potential emergent phenomena. We believe these three …
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Investigating strategies to improve superior sustainable performance in the Namibian mining industry
… underground water, geotechnical risks, depleted ore reserves, declined ore grade, and mineralogical changes. The strategies to improve superior sustainable performance were established by applying a SWOT/TOWS analysis model and by creating an integrated strategy map that consider several mining …
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Life Cycle Analysis of Greenhouse Gas Emissions from the Mining and Milling of Uranium in Saskatchewan
… These differences contribute to a more accurate result. The production-weighted average life cycle GHG emissions intensity is estimated as 45 kg CO2e/kg U3O8 at an average ore grade of 9.12% U3O8 based on relative U3O8 production volumes at Mine-Mill A, B, and C from 2006 to 2010. …
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Geology of the Piney River-Roseland titanium area, Nelson and Amherst counties, Virginia
… (?) rocks that constitute part of the core of the Blue Ridge-Catoctin Mountain anticlinorium. Approximately 72 square miles were mapped in this study. The central part of the mapped area is underlain by a mass of pegmatitic anorthosite, about which other mappable rock units are …
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Geology, mineralogy and geochemistry of the Cerro Matoso nickeliferous laterite, Córdoba, Colombia
… parent peridotite ranges from 0.28 to 0.36%, and ore grade cutoff for materials comprising the laterite profile is 1.5%. Ore occurs as massive and fracture filling types, the massive ore constituting the most important part of the deposit economically. Smectite and serpentine are the dominant …
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Modeling energy consumption in the mining and milling of uranium
… of the models is to estimate the energy-to-grade dependence for uranium extraction, while defining a minimum grade that can be feasibly mined and produced. The results serve as a basis for understanding the factors governing energy consumption in the production of U3O8. The models are …
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White mica: spectrometer design, district-scale mapping, and integration of imaging spectrometer and lidar data
… of 1 and 2 nm. It was determined that RMSE was more sensitive to bandpass than sampling interval variation, while channel center position had little effect. Adding Gaussian noise to the test data degraded the RMSE in all spectrometers, but it was determined that fine spectrometers were more …
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A Comparative Study of Machine Learning and Traditional Techniques for Grade Prediction and Grade-Tonnage Evaluation in a Small VMS Deposit
Small-scale, high-grade volcanogenic massive sulfide (VMS) deposits present unique challenges for resource estimation due to their strong grade variability and complex geological structures. This thesis evaluates whether machine learning methods can improve grade prediction and tonnage estimation …
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Lithium at the Thacker Pass deposit, Humboldt County, Nevada, U.S.A.
… Li clay reserve with ~1.56 Mt of Li supply. Ore-grade lithium occurs in a ~100-m-thick sequence of interbedded lacustrine dark greenish brown to dark greenish gray carbonaceous shale and volcaniclastic siltstone, and thin, light gray rhyolitic ash beds. The strata were deposited inside the …
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Developing quantitative approaches to determine microbial colonisation and activity in mineral bioleaching and characterisation of acid rock drainage
… of valuable metals from mineral sulfide ores of varying grades through biohydrometallurgy. It also influences acid formation and mineral deportment from sulfidic waste rock generated in mining processes and is key to its comprehensive waste rock characterisation for acid forming …