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 18 of 18 for “"gold ore"”.
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Biooxidation and Thiocyanate Leaching of Refractory Gold Ore in One-Step
Gold is among the precious metals and for more than a century, it has been extracted by the cyanidation process. Cyanide is highly toxic for humans and living organisms. Moreover, with increasing gold extraction over time, the average gold grade in minerals has decreased and simultaneously cyanide …
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Geologic and flotation study of an oxidized Cripple Creek gold ore
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1934.
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Major and trace element characteristics of biotite and chlorite as proxies for gold ore mineralization
… in eastern Finland is host to several orogenic gold occurrences. One of these deposits is the Pampalo gold deposit located in Hattu, Ilomantsi. Major and trace element characteristics of biotite and chlorite were analyzed from a representative collection of rock types of different degrees of …
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Laboratory testing and design of a mill for the treatment of a gold ore from Porcupine, Ontario
Thesis: M.S., Massachusetts Institute of Technology, Department of Mining Engineering and Metallurgy, 1917
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The experimental working by wet and dry methods, of a low grade silver and gold ore from Newburyport, Mass.
Thesis: B.S., Massachusetts Institute of Technology, Department of Mining Engineering and Metallurgy, 1877
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Application of HPGR and X-Ray CT to investigate the potential of Witwatersrand gold ore for heap leaching : a process mineralogy approach
… in South Africa host one of the largest known gold resources and rate as the world’s most outstanding example of a fossil megaplacer deposit. For the past 40 years, Witwatersrand gold production in South Africa has been progressively declining due to problems related to high energy costs, …
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The Marcona - Mina Justa District, South-Central Perú: Implications for the Genesis and Definition of the Iron Oxide-Copper (-Gold) Ore Deposit Clan
… the largest concentration of iron oxide-copper-gold deposits in the Central Andes. Hydrothermal activity occurred episodically from 177 to 95 Ma and was controlled by NE-striking faults. At Marcona, emplacement of massive magnetite orebodies with subordinate, overprinted magnetite-sulphide …
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Measurement of impact breakage properties of ore particles using a series of devices
… drop weight tester, split Hopkinson bars and more recently the rotary breakage tester, have been successfully used to characterize ore breakage properties in relation to measured fracture energies. Current theoretical understanding of impact breakage is that there are three important energy …
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A machine vision approach to rock fragmentation analysis
… vision. This instrument has application in the gold mining industry where it could be used to measure the fragmentation of gold ore on a conveyor belt feed to an autogenous mill, for the purpose of controlling the mill. The gold ore can range in size from fine material (< 20mm) to very large …
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Investigating the products from different modes of particle breakage testing
… models is dependent on the accuracy with which ore breakage can be predicted. This hinges on our understanding of the basic concepts of breakage and the different modes in which it manifests in the comminution environment. Three distinctly different modes of breakage were identified and …
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Gold mineralisation and mineral exploration within the Clogau mine, Dolgellau gold belt, N Wales
Gold lodes within the Dolgellau gold belt are interpreted as emplaced by hydrothermal fluids derived from a metamorphic source creating the basement to the Cambrian succession. Previous mining in Clogau/St David’s has focused on extracting gold from the quartz veins, with gold assay results from …
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Application of mineralogy in the interpretation of laboratory scale acid rock drainage (ARD) prediction tests : a gold case study
The mining and beneficiation of gold generates large tonnages of waste, with up to 99% of mined gold ore discharged as waste. The waste generated contains unoxidized sulfides that when exposed to air and water react to form acid, which results in acid rock drainage (ARD). ARD is usually associated …
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Ore Types And Fluid Regimes: Macassa Gold Mine, Kirkland Lake
The Macassa Mine is the only remaining gold producer of seven inter-connected mines which comprise the Kirkland Lake mining district. The district has produced more than 710,000 kg Au since 1913 from quartz veins and lodes within the Archean Timiskaming Group.;There are 3 types of gold ore at the …
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Geochemistry and origin of the Asimotrypes carbonate hosted mesothermal gold deposit, Pangeon mountain, N. Greece
The Asimotrypes mesothermal gold deposit located in the Pangeon Mt (E. Macedonia, N. Greece), is part of the Western Rhodope Massif (WRM), which represents the metamorphic core complex of an alpine collision orogen. Alpine metamorphism, of U. Cretaceous - M. Eocene age, reached upper greenschist to …
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… of exposed sulfide minerals. In the case of gold ores, the mining and beneficiation may also produce As-bearing wastes and this can accelerate the natural mechanisms of As mobilization. The Bakyrchik is the largest gold deposit in Kazakhstan and one of the largest in the world. Gold (Au) is …
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Patterns of Lithology, Structure, Alteration, Trace Elements, Carbonate Mineralogy, and Stable Isotopes around High-Grade Carlin-type Gold Deposits: Turquoise Ridge Deposit, Getchell District, Nevada
… of hydrothermal features surrounding high-grade ore bodies in Carlin-type gold deposits (CTGDs) in Nevada, making exploration, development, and production difficult, especially where visually unaltered, unmineralized rocks occur in close proximity to ore. This thesis, which is divided into 3 …
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The Porgera gold deposit, Papua New Guinea : geology, geochemistry and geochronology
The Porgera gold deposit, located in the highlands of Papua New Guinea (PNG), contains ~410 tonnes Au and ~890 tonnes Ag, distributed between a large lower-grade ore zone (78.6 million tonnes, 3.5 g/tonne Au, 9.9 g/tonne Ag), and a smaller highgrade zone (5.0 million tonnes, 26.5 g/tonne Au, 22.1 …
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The Porgera gold deposit, Papua New Guinea : geology, geochemistry and geochronology
The Porgera gold deposit, located in the highlands of Papua New Guinea (PNG), contains ~410 tonnes Au and ~890 tonnes Ag, distributed between a large lower-grade ore zone (78.6 million tonnes, 3.5 g/tonne Au, 9.9 g/tonne Ag), and a smaller highgrade zone (5.0 million tonnes, 26.5 g/tonne Au, 22.1 …