- Open-pit mining, also known as opencast mining, open-cut mining, and strip mining,
- means a process of digging out rock or minerals from the earth by their elimination from an open pit or borrow.
- The word is used to distinguish this type of mining from extractive methods that need tunneling into the earth.
- Open-pit mines are used when deposits of commercially helpful minerals or rock are found close to the surface; that is, where the overburden (layer material covering the valuable deposit) is comparatively thin or the material of interest is structurally inappropriate for tunneling.
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