In which conditions is open cast mining used?
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Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface. It is applied to ore or rocks found at the surface because the overburden is relatively thin or the material of interest is structurally unsuitable for tunnelling (as would be the case for sand, cinder, and gravel).
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open cast mining is used when the minerals are not very deep down from the surface of the earth
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