open pit mining step,Open-pit mining - WikipediaOpen-pit, open-cast or open cut mining is a surface mining technique of extracting rock or . The steps in the walls help prevent rock falls continuing down the entire face of the wall. In some instances additional ground support is required and.open pit mining step,Open Pit Mining Techniques|Surface Mines|Rock or Mineral ExtractionOpen-pit mining, also known as opencast mining, open-cut mining, and strip . The steps in the walls help avert rock falls continuing down the entire face of the.
open pit mining step