Mining for gold silver
The principal sources of silver are copper, copper-nickel, gold, lead, and lead- zinc ores obtained from Canada, Mexico, Poland, Peru, Bolivia, Australia and the Gold mining is the resource extraction of gold by mining. Contents. 1 History; 2 Statistics It is particularly appropriate for low grade gold and silver ore processing (e.g. less than 5 ppm gold) but its use is not restricted to such ores. There are