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The rare-earth elements (REE), also called the rare-earth metals or rare earths or, in context, rare-earth oxides, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals.
Depiction of the patio process at the Hacienda Nueva de Fresnillo, Zacatecas state (Mexico), Pietro Gualdi, 1846. The patio process is a process for extracting silver from ore. Smelting, or refining, is most often necessary because silver is only infrequently found as a native element like some metals nobler than the redox couple 2 H + + 2 e− ...
At the time of its closure in 1982, the Bunker Hill lead smelter was the largest in the world, and the complex included a zinc plant and silver refinery. [3]: 201–202, 205 The Coeur d'Alene people were able to regain control of a portion of Lake Coeur d'Alene, after a long history of their interests being ignored. [3]: 209
Silver mining is the extraction of silver by mining. Silver is a precious metal and holds high economic value. Because silver is often found in intimate combination with other metals, its extraction requires the use of complex technologies. In 2008, approximately 25,900 metric tons of silver were consumed worldwide, most of which came from ...
Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore. [1][2][3] The process is based on the ...
The mines of Laurion (or Lavrion) [1] are ancient mines located in southern Attica between Thoricus and Cape Sounion, approximately 50 kilometers south of the center Athens, in Greece. The mines are best known for producing silver, but they were also a source of copper and lead. A number of remnants of these mines (shafts, galleries, surface ...
Nadir also refers to the downward-facing viewing geometry of an orbiting satellite, [2] such as is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing a spacewalk. A nadir image is a satellite image or aerial photo of the Earth taken vertically. A satellite ground track represents its ...
The Rochester Mine is the only currently operating primary silver producer in Nevada and the second largest in the US, after the Greens Creek mine in Alaska. In 2015 it produced 4.6 million ounces of silver and 52,588 ounces of gold from an open pit and heap leaching operation. It is owned by Coeur Mining. [1][4][5]
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