Why is underground mining of coal so dangerous?

1 Answer
Feb 20, 2016

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Basically, underground mining of coal has four risks: 1) collapse or cave-ins, 2) methane gas that accumulates in the coal can ignite and cause a major explosion, and 3) air from the surface needs to be pumped into the mine where people are working and this can malfunction, and 4) people can get killed in mining machinery, including hosts, drills or during blasting.