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The century-long history of hard rock gold mining in California?s Sierra Nevada is a tale of hardships, triumphs, and occasional tragedy for the many men involved.

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Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals such as those containing metals like gold, copper, zinc ...

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Successful gold mining is ... “Bedrock” is the solid hard rock of the earth’s crust–like a cliff or ... The overall process of successful mining is ...

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The rest of the reef that remained in the ground was the ore for the hard rock miners to exploit ... Reef Gold and Hard Rock Mining; Alluvial Gold and Its Recovery;

Hard Rock Mining – Rather than searching through sediment for loose gold pieces, hard rock mining is the process of removing the gold and gold ore which is...

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