Two Methods Used in the Coal Exploitation

Generally speaking, there are two methods used in the coal exploitation: over ground and underground exploitation. The choice of different mining methods id determined by the geography conditions, coal hierarchy and the sea filling project. Opening mining is often restricted by the protection of original geography so that the underground mining enjoys significant popularity among machinery manufacturing companies. If the coal layer is very close from the ground and the permutation is very close, then it is thought that this mining method is open mining.

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