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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 ...