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15 killed, 9 injured in northern China coal mine explosion

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Published : Nov 19, 2019, 7:29 PM IST

Gas explosions in mines usually occur when volatile methane, also known as coal gas, is not properly ventilated after leaking from the seam. At a high concentration, the gas can be ignited by a simple spark, open flame or electrical equipment, setting off second explosions of coal dust in the air.

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