Mining and mineral seams depends on many factors, geological conditions that are of mineral, mining capacity, system operators selection, the ability to increase the capacity of the mine as required, the ability to mechanize exploitation.
đang được dịch, vui lòng đợi..
![](//viimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)