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22/04/2011· One of the common associations with gold in detrital deposits is the association of gold with uranium and carbon. This holds true in the Witwatersrand and all the other gold deposits of a detrital nature. For many years the origin of the carbon was hotly debated with the most recent evidence holding that it is from primitive life forms that lived in the distant past in the Archean.
gold alloy formed in the potassic zone are in general too small to be collected by panning methods. Alloy signatures of these tiny grains are generally distinct from proximal placer gold, whose composition is more similar to gold grains hosted in propylitic alteration. Consequently, the use of gold as a PIM is dependent upon an understanding of the
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18/04/2011· Maybe you have heard of the Witwatersrand in South Africa if you haven't yet is the world's largest deposits of gold that since its discovery in 1886 has produced over 40% of the total gold supply ever mined in the world. This makes it the most glaring example of a detrital gold deposit in the world. The type of rock hosting this vast deposit is conglomerate that until about a year ago the
01/04/2017· Read "A distinctive Pd-Hg signature in detrital gold derived from alkalic Cu-Au porphyry systems, Ore Geology Reviews" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Gold and silver are obtained from a variety of ores. Most people think of nuggets and such, but the truth is that very little comes from nuggets nearly all newly mined gold comes from ores mined from the natural hard rocks that contain gold in tiny, even microscopic particles.
Rare channel iron deposits are rendered uneconomic because of a silica cement proving too durable for easy mining and crushing. The water content of channel iron deposits (quoted as Loss on Ignition) is from 7% to 12%, which is the highest of all iron ore types, generally due to the presence of goethite-limonite.
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01/05/2006· Read "Transport and concentration of detrital gold in foreland basins, Ore Geology Reviews" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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In addition, interpretation of the origin of detrital gold grains is further complicated by the potential for multiple sources of gold in metallogenically complex regions. For these reasons, information on the source style of mineralization of detrital gold grains gained from the gold itself would be highly beneficial. Download high-res image
Detrital gold as a deposit-specific indicator mineral by LA-ICP-MS analysis . D.A. Banks, R.J. Chapman, C. Spence-Jones. Ores and Mineralization Group School of
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25/08/2014· Witwatersrand quartz-pebble conglomerate (gold ore) from the Neoarchean of South Africa. (6.5 cm across at its widest) ----- Conglomerate is a moderately common siliciclastic sedimentary rock. Occasionally, conglomerates have economic significance, such as the gold-bearing quartz pebble conglomerates of the Witwatersrand Supergroup in South Africa.
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Research on detrital pyrite in Archean sedimentary rocks is a fascinating subject due to the large variation in pyrite morphology and economic implications. A growing number of different tools is available to determine the provenance of detrital pyrite in clastic sedimentary successions. Whether hydrothermal, paleoplacer, synsedimentary
Geochemistry and Geophysics of Iron Oxide-Apatite Deposits and Associated Waste Piles with Implications for Potential Rare Earth Element Resources from Ore and Historical Mine Waste in the Eastern Adirondack Highlands, New York, USA
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Gold ore is a type of ore that can be obtained by mining gold ore rocks, requiring a Mining level of 40 or higher, and granting 65 experience. Gold ore can be smelted into gold bars through the Smithing skill, requiring level 40 Smithing. Gold bars can then be crafted to make various pieces of...
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Detrital origin of hydrothermal Witwatersrand gold-a review. Terra Nova, 1997. Hartwig Frimmel. Download with Google Download with Facebook or download with email. Detrital origin of hydrothermal Witwatersrand gold-a review . Download. Detrital origin of hydrothermal Witwatersrand gold-a review. Hartwig Frimmel
formation of the gold ores. He classified the ore genetic theories into three types: (1) (Modified) Placer Model where the gold was of placer origin, being derived by erosion from pre-existing gold-bearing structures, and possibly being recrystallized after deposition in the conglomerate reefs; (2) Precipitation Model in which gold and pyrite
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23/02/2018· The Nayega deposit comprises eluvial rubble of manganese oxides ranging in size from flakes to cobbles, overlying detrital and in-situ manganese ore extending up to 10m below surface blanketed by a veneer of detrital material that averages 0.5m thick. Mineralisation extends over a strike length of 2.2km at widths of up to 500m.