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Gold Mining Techniques Today

Mining History and Geology of the California Gold Rush. The Nature of Gold. Chemical Symbol Au Atomic Number 79 Atomic weight 196.967 Specific Gravity 19.3 (19.3 times as heavy as an equivalent volume of water twice as heavy as pure lead 1 cubic foot weighs over 1 2 ton) Hardness 2.5 3 on the Moh's hardness scale (teeth are harder, miners are sometimes pictured biting nuggets to test the.

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