Results 251 to 260 of about 1,590 (296)
SHRIMP U–Pb zircon ages, mineral compositions and geochemistry of placer nephrite in the Yurungkash and Karakash River deposits, West Kunlun, Xinjiang, northwest China: Implication for a Magnesium Skarn [PDF]
Ore Geology Reviews, 2016 The most highly valued placer nephrite deposits in the world occur in the Yurungkash and Karakash Rivers (also known as the White and Black Jade Rivers) in Hetian, Xinjiang, Northwest China.
Rong-Qing Zhang
exaly +2 more sources
Comparison of the chemistry and mineralogy of ilmenite concentrates sourced from fluvial (Brahmaputra River) and beach placer (Cox’s Bazar) deposits, Bangladesh [PDF]
Ore Geology Reviews, 2020 Bangladesh has known concentrations of heavy mineral (HM) sand resources in shoreline placer deposits along the southern and eastern coastlines and also within river sand bar placer deposits associated with the extensive river systems throughout the ...
Suresh Kumar Bhargava +2 more
exaly +1 more source
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Biological and Geochemical Development of Placer Gold Deposits at Rich Hill, Arizona, USA [PDF]
Minerals (Basel, Switzerland), 2018 Placer gold from the Devils Nest deposits at Rich Hill, Arizona, USA, was studied using a range of micro-analytical and microbiological techniques to assess if differences in (paleo)-environmental conditions of three stratigraphically-adjacent placer ...
Erik Melchiorre +2 more
exaly +3 more sources
2020
Placer gold deposits are abundant in Mongolia and form through endogenic and exogenic processes. Deposits are classified into four major genetic types: (1) eluvial-weathering zone, (2) deluvial, (3) proluvial, and (4) alluvial. The most economic deposits are often sourced from upper Cretaceous rocks and formed in late Cenozoic alluvial fans (Liskun and
Tankhain Semeihan, Uyanga Bold
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Placer gold deposits are abundant in Mongolia and form through endogenic and exogenic processes. Deposits are classified into four major genetic types: (1) eluvial-weathering zone, (2) deluvial, (3) proluvial, and (4) alluvial. The most economic deposits are often sourced from upper Cretaceous rocks and formed in late Cenozoic alluvial fans (Liskun and
Tankhain Semeihan, Uyanga Bold
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Journal of the Geological Society, 1985
Editorial note: A meeting on ‘Placer deposits’, convened by Dr D. G. Sutherland (Placer Analysis Ltd, Edinburgh) and Dr I. Reid (Birkbeck College, London) on behalf of the British Geomorphological Research Group and the Institution of Mining and Metallurgy was held at the Geological Society. Burlington House on 15 November 1984.
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Editorial note: A meeting on ‘Placer deposits’, convened by Dr D. G. Sutherland (Placer Analysis Ltd, Edinburgh) and Dr I. Reid (Birkbeck College, London) on behalf of the British Geomorphological Research Group and the Institution of Mining and Metallurgy was held at the Geological Society. Burlington House on 15 November 1984.
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SEG Discovery, 1996
Editor’s note: Smimov uses the weathering definition of eluvial, meaning “an accumulation of rock debris produced*in-place by decomposition or disintegration of rock; a residue.” Two other terms in Smimov’s classification are not in common usage in North America nor in North American placer classification schemes By Russian definition, diluvium is an ...
G. JAMSRANDORJ, SERGUEI A. DIATCHKOV
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Editor’s note: Smimov uses the weathering definition of eluvial, meaning “an accumulation of rock debris produced*in-place by decomposition or disintegration of rock; a residue.” Two other terms in Smimov’s classification are not in common usage in North America nor in North American placer classification schemes By Russian definition, diluvium is an ...
G. JAMSRANDORJ, SERGUEI A. DIATCHKOV
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1987
Placer deposits provided early man with the first samples of gold and thereafter have accounted for a large production of the metal. If we include the Witwatersrand and other quartz-pebble conglomerates as fossil placers or modified placers, the placer type of auriferous deposit has provided more than two thirds of the world’s store of gold, about 80 ×
J. B. Tyrrell +12 more
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Placer deposits provided early man with the first samples of gold and thereafter have accounted for a large production of the metal. If we include the Witwatersrand and other quartz-pebble conglomerates as fossil placers or modified placers, the placer type of auriferous deposit has provided more than two thirds of the world’s store of gold, about 80 ×
J. B. Tyrrell +12 more
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Journal of the Geological Society, 1985
Report of a whole-day joint meeting of the Institution of Mining and Metallurgy and the British Geomorphological Research Group held at Burlington House, 15 November 1984. The meeting was organized by Professor F. K. G. Hosking, Dr Ian Reid, Dr D. G. Sutherland and Professor M. F. Thomas, and convened by Drs Reid and Sutherland.
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Report of a whole-day joint meeting of the Institution of Mining and Metallurgy and the British Geomorphological Research Group held at Burlington House, 15 November 1984. The meeting was organized by Professor F. K. G. Hosking, Dr Ian Reid, Dr D. G. Sutherland and Professor M. F. Thomas, and convened by Drs Reid and Sutherland.
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1991
Alluvial, or placer, gold has been washed away by flowing water or carried by blowing wind. It has then been deposited along with earth, sand, gravel, and other transported matter, especially on river beds. Although there is no way of knowing exactly how long ago humans felt enamored of the shiny yellow metal, there is reason to presume that gold ...
openaire +1 more source
Alluvial, or placer, gold has been washed away by flowing water or carried by blowing wind. It has then been deposited along with earth, sand, gravel, and other transported matter, especially on river beds. Although there is no way of knowing exactly how long ago humans felt enamored of the shiny yellow metal, there is reason to presume that gold ...
openaire +1 more source