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179 Mercury Contamination from Hydraulic PlacerGold Mining in the Dutch Flat Mining District, California By Michael P. Hunerlach, James J. .
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Jan 18, 2015· Larger Scale Placer Mining Operations and Equipment . Ophir Placer Gold Mine ... I did everything possible to access and chip away the frozen cover. ...
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Dec 24, 2013· Video embedded· This classic film, produced in the 1980''s, uses archival footage to paint a picture of gold mining practices outside of Fairbanks in 1949. While today we ...
By FRED H. MOFFIT ABSTRACT Mining in the northern Copper River region''in 1941 included both goldlode and .goldplacer operations but .
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