Opencast mines are burrowed on benches, which depict vertical levels of the pit. These benches are usually excavated at between four and sixtymeter intervals. The size of the benches depends on the size of bulldozers used to make them.
Jun 17, 2013· Open Cast Small Scale Copper Mining Plant,Copper Crusher Sale. Open Cast Small Scale Copper Mining Plant. Get Price. Get Tech Support. Get More Info of Our Products. For product information and pricing, ... mined by smallscale open cast mines or underground mansized galleries.