Results 251 to 260 of about 33,890 (308)
History of the geographic distribution of the western blacklegged tick, Ixodes pacificus, in the United States. [PDF]
Ticks Tick Borne DisEisen L +3 more
europepmc +1 more source
Clinical efficacy of etonogestrel implants on relieving dysmenorrhea in endometriosis and adenomyosis women for up to 3 years. [PDF]
Front Med (Lausanne)Li Y, Li D, Feng T, Wang C.
europepmc +1 more source
Mining, development and environment in Central Asia : toolkit companion with case studies [PDF]
Bogdetsky, V, Novikov, V
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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
openaire +1 more source
Economic Geology, 2003
Recent fluvial sediments of the Rio Neuquen, Argentina, contain variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain pristine crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally rimmed by gold with a wormlike or crystalline texture (type 2
A. J. McCready, J. Parnell, L. Castro
openaire +2 more sources
Recent fluvial sediments of the Rio Neuquen, Argentina, contain variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain pristine crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally rimmed by gold with a wormlike or crystalline texture (type 2
A. J. McCready, J. Parnell, L. Castro
openaire +2 more sources
The in vitro formation of placer gold by bacteria
Geochimica et Cosmochimica Acta, 1994A laboratory simulation was developed to provide mechanistic information about placer (nugget) gold development in the natural environment. To initiate the simulation, ionic gold was immobilized to a high capacity by Bacillus subtilis 168 (116.2 μg/mg dry weight bacteria) as fine-grained intracellular colloids (5–50 nm).
Southam, G, Beveridge, TJ
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Paradoxes of the placer gold economy
POWER AND ADMINISTRATION IN THE EAST OF RUSSIA, 2022The article is devoted to the study of influence of placer gold mining on the socio-economic processes in in the eastern areas of Russia on the example of the Trans-Baikal territory. Reconciliation of economic and environmental interests in the extraction of placer gold remains one of the most relevant in the field of natural resource management.
I. P. Glazyrina +2 more
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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
openaire +1 more source