Open-pit mining - WikipediaOpen-pit, open-cast or open cut 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 . such that the environment can handle the load of acid and associated heavy metals.opencast metal mining methods line,1.1 PHASES OF A MINING PROJECTthese metal ores are the subject of this Guidebook. The Guidebook . ores that are extracted using strip mining methods, . such as sand, gravel, and line.
opencast metal mining methods line