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Miners drilled by hand or used compressed air drills. They drilled in sunken shafts to extract gold from the quartz rock, which was known as quartz or hard rock mining. Pans. Panning for gold was also known as "placer mining." Early miners sat by riverbeds, scooping wet soil into shallow metal pans.
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Placer Mining Equipment Gallery. The sulfides were processed through the ball mill and then chemically treated for the extraction of gold. The photo below shows a crane lifting the massive core trommel that was 8 feet in diameter and 40 feet long.
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Most bauxite, iron, and copper ore is mined by open pit techniques, lead and zinc ore are principally extracted by underground mining methods, and precious metals, particularly gold and most notably in the USA and Australia, tend to be recovered in recent years .
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