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Geological Survey. ii ... Bar chart showing leading silver mining countries ... The precious metal ores (gold and silver) came from 30 lode mines and 10 placer ...
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Geological Survey. ii ... Bar chart showing leading silver mining countries ... The precious metal ores (gold and silver) came from 30 lode mines and 10 placer ...
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Silver mining in the United States began on a major scale with the discovery of the ... and 39 mines reported silver as a byproduct of gold and base metals ...
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Assessment of equipment operators'' noise exposure in western underground gold and silver mines.
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