Open Pit Mining

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Open-pit mining, also known as open-cast mining, open-cut mining, and strip mining, refers to a method of extracting rock or minerals from the earth by their removal from an open pit or borrow. The term is used to differentiate this form of mining from extractive methods that require tunneling into the earth. Open-pit mines are used when deposits of commercially useful minerals or rock are found near the surface; that is, where the overburden (surface material covering the valuable deposit) is relatively thin or the material of interest is structurally unsuitable for tunneling (as would be the case for sand, cinder, and gravel). For minerals that occur deep below the surface-where the overburden is thick or the mineral occurs as veins in hard rock- underground mining methods extract the valued material.

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Pagina's: 136, Paperback, Betascript Publishers