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In february 2016, miners were killed by an unsuppressed methane gas explosion at the severnaya coal mine in vorkuta, russia. In november 2016, miners were killed due to an unsuppressed explosion in jinshangou coal mine in chongqing. the risk of a methane gas andor a coal dust explosion is clearly still present in coal mining operations.oct 13, 2017 explosions in coal mines as a result of coal dust accumulation is not as common as that which is associated with methane combustion, as a very high concentration of coal dust must be suspended within the air. methane-coal dust hybrid mixture explosions, can also occur with more severe characteristics as compared to either explosion alone characterization of methane explosion and spontaneous combustion hazards in longwall gobs, funded by cdc niosh, 014, $1.36 million, lead principal investigator; historic analysis of methane and coal dust explosions in u.s. coal mines, wheeling jesuit there are two main types of coalmine explosions: methane and coal dust. methane explosions occur when a buildup of methane gas contacts a heat source and there is not enough air to dilute the gas level below its explosion point. likewise, fine particles of coal dust in the right concentration that contact a source of heat can also be explosive.mitsubishi hojyo coal mine disaster, the deadliest mining accident in japan, caused 687 deaths. It was caused by a gas explosion at the mitsubishi hojyo coal mine located in the kyushu island of japan. the disaster took place on december 1914.