artisnal miners ball mill,Reducing mercury use in artisanal and small-scale gold miningPieces of 'sponge gold' in this photograph are the result of mercury amalgamation. Each piece of sponge gold represents a day of work for a group of miners. The large ball in the foreground, is 8 grams - worth. 385 USD, at a price of 1500 USD/ounce. Reducing mercury use in artisanal and small-scale gold mining. 5.artisnal miners ball mill,Preliminary Survey of Artisanal and Small Scale Gold Mining (ASGM)Preliminary survey of artisanal and small scale gold mining (ASGM) in China. – Case study in Lingbao, . production towns in China and two major gold mining areas in Lingbao, a county-level city under Sanmenxia city,. Shanghai province. .. Workers use rollers, ball mills, and crucibles in their workshops. They use ball mills.