There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out.
团溪锰矿的直接顶板粘土之上有一煤层,且不稳定,采后容易,出。
There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out.
团溪锰矿的直接顶板粘土之上有一煤层,且不稳定,采后容易,出。
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