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1. Mineralurgy
The different occurrences of gold in the ore correspond to different mineralurgical methods, leading to concentrates of varying grades and variable recoveries. The first observation to be made is the size of free gold grains or carrier minerals, notably sulfides.
1.1 Mineralogical phase separation
Common mineralurgical methods are generally simple in their principles.
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Gravity beneficiation is mainly applied to free placer gold, but can also be combined with flotation of gold-bearing sulfides. In the first case, settling is often followed by screening prior to gravimetric separation. In the second case, crushing and grinding are required. As a general rule, the presence of reasonable quantities of coarse gold requires...
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