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Placer mining --- Prospecting --- Ores --- Sampling and estimation
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Prospecting --- Gold mines and mining --- Placer mining --- Opals
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Mercury --- Placer mining --- Gold mines and mining --- Environmental aspects
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"A revolution in placer mining from inception in the 1880s until its demise in the 1960s and its impact on Idaho, the nation's fourth leading producer of dredged gold which provides a lens through which to observe the practice and history of gold dredging around the world"--
Placer mining --- Gold mines and mining --- History. --- History.
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Placer mining --- Hydrology --- Water quality --- Trace elements --- Environmental aspects
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Gold mines and mining --- Silver mines and mining --- Placer mining --- History. --- History. --- History.
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