Results 251 to 260 of about 33,735 (308)

Anomalous Gold Concentrations in Hypersaline Wetland Sediments (Laguna Honda, South Spain) Caused by Nanoparticles Used in Agricultural Practices: Environmental Transformation. [PDF]

Toxics
Medina-Ruiz A, Jiménez-Millán J, Abad I, Jiménez-Espinosa R.   +3 more
europepmc   +1 more source

Laser‐Assisted Processing and Modification of Bioactive Glasses: A Review

Advanced Healthcare Materials, EarlyView.
Laser technologies provide powerful tools to process and transform bioactive glasses for advanced biomedical applications. This review discusses laser‐matter interaction mechanisms, laser surface engineering, and laser‐assisted fabrication of scaffolds and nanofibers.
Antonio Riveiro, Mario González‐Quintas, Mónica Fernández‐Arias, Jesús del Val, Félix Quintero, Rafael Comesaña, Fernando Lusquiños, Julian R. Jones, Juan Pou   +8 more
wiley   +1 more source

In situ gold adsorption experiment at an acidic hot spring using a blue-green algal sheet. [PDF]

Sci Rep
Nozaki T, Fukushima Y, Okada S, Takaya Y, Makabe A, Watanabe M.   +5 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

History of the geographic distribution of the western blacklegged tick, Ixodes pacificus, in the United States. [PDF]

Ticks Tick Borne Dis
Eisen L, Saunders MEM, Kramer VL, Eisen RJ.   +3 more
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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Placer Gold Deposits

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
openaire   +1 more source

Gold Deposits—Placers

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, Waldemar Lindgren, B. R. MacKay, N. A. Shilo, Yu V. Shumilov, S. G. Zhelnin, Yu A. Travin, J. B. Mertie, Eric S. Cheney, Thomas C. Patton, Christopher B. Gunn, Ralph Tuck, Leendert Krook   +12 more
openaire   +1 more source

Crystalline Placer Gold from the Rio Neuquen,Argentina: Implications for the Gold Budget in Placer Gold Formation

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

Paradoxes of the placer gold economy

POWER AND ADMINISTRATION IN THE EAST OF RUSSIA, 2022
The 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, I. S. Kalgina, V. S. Brezgin   +2 more
openaire   +1 more source