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The bauxite (red-brown solid) - aluminium oxide mixed with impurities-is extracted from the earth. The extracted aluminium oxide is then treated with alkali, to remove the impurities. This results in a white solid called aluminium oxide or alumina.
Mining, Crushing and Conveying Once the caprock layer has been broken by blasting or ripping, the bauxite is ready to be mined. The average thickness of the bauxite is about 4m (including the caprock and the underlying friable bauxite) but it can be as much as 10m.