open pit copper mines
 

Open Pit Copper Mines

Open-pit mining - Wikipedia, the free encyclopedia

OverviewContentsExtractionRehabilitationTypical open cut gradesOpen-pit or open-cast mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow. 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 minerals or rocks are found near the sur…See more on en.wikipedia.org · Text under CC-BY-SA license
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