Open-pit mining - WikipediaOpen-pit, open-cast or open cut mining is a surface mining technique of extracting rock or . Open-pit mines are used when deposits of commercially useful minerals or rocks are found near the surface; . These benches are usually on four to sixty meter intervals, depending on the size of the machinery that is being used.machine use in open cast mining,Surface (Open Cast) Mining Equipment - Virtual Mine ExpoVirtual Mine Expo, Surface Mining Equipment page. . With over $50 million in inventory, we have the used heavy equipment you need available for shipping.
machine use in open cast mining