Mica is all mica mineral known collectively, is rich in potassium, magnesium, aluminum, iron, lithium and other metal elements, are widely used in industry, medicine industry, because of mica has a good insulation, high temperature resistant, heat insulation, toughness and other characteristics, in the construction, electrical insulating materials, rubber and other industries all have a…

The open coal mine has characteristic of mineral deposits from shallow surface and abundant reserves. So the rocks and earth covered on the surface of ore are peeled so as to excavate directly from up to down in the structure of footsteps.