The placer gold mining methods is usually divided into three operations:
(1) Washing operations
The cemented ore sand is separated by water immersion, washing, and mechanical agitation, gravel, sand, and clay are separated, and the clay and gold particles adhered to the gravel are cleaned. The ore-washing operation includes three processes: crushing, screening, and desliming.
(2) Rough separation
The characteristics of the mine can be divided into these modes:
fixed sluice box, shaking table process;
fixed or vibrating sluice-jig machine-shaking table process;
multi-stage jig machine-shaking table process;
centrifugal concentrator-shaking table process.
(3) Cleaning separation
Heavy sand and mercury are mixed in a mercury mixing cylinder, heavy sand is not adsorbed by mercury and is removed, but the gold will be adsorbed into the mercury.
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