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  3. 3 Stages Of Refining Metallic Minerals

3 Stages Of Refining Metallic Minerals

Mining and processing of non-metallic minerals v2.1 september 2014 2 2 process description most of the non-metallic minerals are extracted by open-pit mining.Open-pit mining methods are used where an ore body lies at or near the surface.To uncover the ore body, the overburden waste rock and soil lying over it must be removed.

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