mineral processing small scale gold mining equipment Jun 21, 20170183;32;Gold mining. Gold mining is the resource extraction of gold by mining. As of 2016, the world's largest gold . It is particularly appropriate for low grade gold and silver ore processing e.g. less than 5 ppm gold but its use However, mercury is still used in artisanal and small scale gold mining ASGM, often clandestine, gold prospecting.