Bump is a dangerous hazard in coal mine production all over the world.

冲击地压是世界范围内煤矿生产中最严重的自然灾害之一。

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In coal mine production, along with the exploitation of coal seam, usually gush methane.

在煤矿生产中，随着煤层的开采，往往会从矿井中涌出瓦斯。

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The drawing out of coal bed methane was began in 1958 for fail to safety in coal mine production.

基于矿井安全生产，从1958年开始抽放矿井瓦斯，抽放量不断提高，瓦斯利用规模迅速扩大。

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In 1993, the government allowed private companies to mine for coal but only for captive use, as production from state-run companies was unable to meet domestic demand.

WSJ: India Panel: Cancel All Coal Permits From 1993 to 2010