A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting .. In materials processing a grinder is a machine for producing fine particle size . Ball mills normally operate with an approximate ball charge of 30%. . SAG mills are primarily used at gold, copper and platinum mines with.
A ball mill is a type of grinder used to grind, blend and sometimes for mixing of materials for use . The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used .. Lixiviant · Heap leaching · Dump leaching · Tank leaching · In situ leaching · Gold chlorination · Gold cyanidation · Bayer process.