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Open-pit mining - Wikipedia

2018-6-15 · This form of mining differs from extractive methods that require tunneling into the earth, such as long wall mining.Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface; that is, where the overburden (surface material covering the valuable deposit) is relatively thin or the …

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German mining industry overview - Wiley Online Library. This report provides a brief overview of the German mining indus- try with some specific examples of planning and equipment used in underground and open- cast coal mining, in potash mining as well as in sand and gravel quarries.

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