Results 271 to 280 of about 2,041,224 (354)
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2016
Brief description of the several orogenic gold deposits is provided together with the basic principles of the gold projects evaluation. Emphasis is made on methodology of the gold deposits sampling, geological interpretation and estimation resources.
Ulrich Kretschmar, Derek McBride
semanticscholar +3 more sources
Brief description of the several orogenic gold deposits is provided together with the basic principles of the gold projects evaluation. Emphasis is made on methodology of the gold deposits sampling, geological interpretation and estimation resources.
Ulrich Kretschmar, Derek McBride
semanticscholar +3 more sources
A metasedimentary source of gold in Archean orogenic gold deposits
Geology, 2021The sources of metals enriched in Archean orogenic gold deposits have long been debated. Metasedimentary rocks, which are generally accepted as the main metal source in Phanerozoic deposits, are less abundant in Archean greenstone belts and commonly ...
I. Pitcairn, E. al.
semanticscholar +1 more source
, 2020
Recognizing if and how Au is remobilized, in solid, melt, or fluid state, is critical for understanding the origin of high-grade ore zones in Au deposits.
E. Hastie, D. Kontak, B. Lafrance
semanticscholar +1 more source
Recognizing if and how Au is remobilized, in solid, melt, or fluid state, is critical for understanding the origin of high-grade ore zones in Au deposits.
E. Hastie, D. Kontak, B. Lafrance
semanticscholar +1 more source
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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, 2020
The North China Craton contains voluminous gold deposits, which occur within the Northern Margin Gold Belt, the Southern Margin Gold Belt, and the Jiaodong Gold Province.
Qingdong Zeng +6 more
semanticscholar +1 more source
The North China Craton contains voluminous gold deposits, which occur within the Northern Margin Gold Belt, the Southern Margin Gold Belt, and the Jiaodong Gold Province.
Qingdong Zeng +6 more
semanticscholar +1 more source
Chapter 35: Gold Deposits of the Jiaodong Peninsula, Eastern China
Geology of the World’s Major Gold Deposits and Provinces, 2020The Jiaodong gold province, within the eastern margin of the North China block and the translated northeastern edge of the South China block, has a stated premining gold resource exceeding 4,500 metric tons (t).
K. Qiu +7 more
semanticscholar +1 more source
Chapter 32: Gold Deposits of the Archean Abitibi Greenstone Belt, Canada
Geology of the World’s Major Gold Deposits and Provinces, 2020The Neoarchean Abitibi greenstone belt in the southern Superior Province has been one of the world’s major gold-producing regions for almost a century with >6,100 metric tons (t) Au produced and a total endowment, including production, reserves, and ...
B. Dubé, P. Mercier-Langevin
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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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1999
Abstract Epithermal ore deposits form in the shallow portions of hydrothermal systems, from the surface to less than about 1-km depth. The hydrothermal activity is associated with contemporaneous volcanism and related magma intrusions, and the ore is hosted typically by volcanic rocks.
Jeffrey W. Hedenquist, Antonio Arribas
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Abstract Epithermal ore deposits form in the shallow portions of hydrothermal systems, from the surface to less than about 1-km depth. The hydrothermal activity is associated with contemporaneous volcanism and related magma intrusions, and the ore is hosted typically by volcanic rocks.
Jeffrey W. Hedenquist, Antonio Arribas
openaire +1 more source