25.3 Crushing and milling | Mining of mineral resources ...
Inside a ball mill, the balls move round in a circle as the mill turns, crushing the ore into a powder. ... In 1964 the Phalaborwa Mine, an open pit copper mine, commenced its operations. Today the pit is 2 km wide. Loolekop, the large hill, has been completely mined away over the years. A total of 50 different minerals are extracted from the mine.
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