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.

1. Simple structure, installation, operation and maintenance are also very convenient; equipment costs are relatively low, with less investment for greater benefits. 2. System sand machine production efficiency is high. With the VSI sand making machine, which has a high output of 100-500 t / h, the increase in output is evident compared to conventional…