Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste . The earliest crushers were hand-held stones, where the weight of the stone . Other metallurgical developments such as silver and gold mining mirrored the.feeding size of stone for gold mining,Mill (grinding) - WikipediaA mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting . After the grinding the state of the solid is changed: the grain size, the grain .. product size in micrometers; F80 is the mill circuit feed size in micrometers. . SAG mills are primarily used at gold, copper and platinum mines with.
feeding size of stone for gold mining