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To increase purity of a desired mineral

A deposit or formation, usually of loose materials, concentrated by channeled erosional forces

A machine using 2 parallel rotating cylinders covered by a belt that move each other in tandem, for the purpose of transporting objects on the moving belt

Cavities formed along strata caused by natural or manmade forces

Solid rock attached to the earth

Generally describing layers of sedimentary rock

A mill utilizing a hammer and swing arm apparatus to pulverize ore

Dropping prices or value in a financial market

Production of economic minerals from beach deposits including beach placers

A circular centrifugal device which accelerates electrons with a rotating magnetic field