Shanghai Shibang Thunder Mill

Opencast gold mining.Types of open cast gold mining - africar-hire.Open-pit mining - wikipedia.Open-pit, open-cast or open cut mining is a surface mining technique of extracting rock or this depends on how weathered the rocks are eroded rocks, and the type of rock, and also how gold is generally extracted in open-pit mines at 1 to 5 ppm parts per million but in certain cases, 0.75 ppm.