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 Men are lucky to be able to appropriate a great part of world gold reserve, by help elementary ways. For millions years, nature let itself go the precious metal from its bulky matrix by separating it from viles materials and by putting it down on the ground. Fortuitous discovery of such deposits excited certainly first envy and start great gold rushes in California, Australia, and Alaska. However, it exists others extraction process they depend on the nature of deposits.
Mechanical Extraction:
Washing, this primitive process is still used. First, if
needed, material that contains metal is weathered with "brocard"
or "American pestle". Then, this material is poured on
"washers" made of wooden canals with rough bottoms. Water
that runs in those "washers" carries away material and
gold,which is,heavier, remains in the rough bottom.
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