Open pit mining
OverviewExtractionWastePollutantsHydrology in miningUntoppingRehabilitationTypical open cut grades
Open pit mining, also known as open cast or open cut mining and in larger contexts mega mining, , is a surface mining technique of extracting rock or minerals from the earth from an open air pit, sometimes known as a borrow.
This form of mining differs from extractive methods that require tunnelling into the earth, such as long wall mining. Open pit mines are used when depositsmercially usefu