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Home > Gold, iron, copper ore > small scale gold minnung
small scale gold minnung
Placer mining - Wikipedia, the free encyclopedia
Placers supplied most of the gold for a large part of the ancient world. Hydraulic mining methods such as hushing were used widely by the Romans across their empire ...
Salt mining - Wikipedia, the free encyclopedia
A salt mine is a mine that extracts rock salt or halite from deposits of evaporite. Avery Island, Louisiana; Detroit, Michigan, 1,100 feet (340 m) beneath which the ...
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