A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. In industry, crushers are machines which use a metal surface to break or compress materials into small fractional chunks or denser masses.
The first step in producing aluminium is mining its ore bauxite. Preparation of the mining area; bauxite mining; crushing; ore transport; and rehabilitation. or management plans are developed to minimise the impact of mining on them.