Staffs training activity of coal mining enterprise, it is the important component of manpower resources management, keep being organized and operated effectively entirely essential means.

煤矿员工培训活动，是人力资源管理的重要组成部分，是维持整个组织有效运转的必要手段。

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The event is ore earthquake of rock burst type related to coal mine exploitation and mining activity, the micro-earthquake swarms belong to occasional local stress releasing.

这次微震群属于冲击地压型矿震，与煤矿开采及回采工程活动有关，属于偶发的局部应力释放。

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Union Pacific has its network well spread in the PRB region, which has witnessed an uptick in coal mining activity lately.

FORBES: Union Pacific's Coal Freight Business Chugs Ahead After Slowdown

Union Pacific was no different but increased coal mining activity in Powder River Basin region situated in parts of Wyoming and Montana could reverse the slide in coal freight volumes for the company.

FORBES: Union Pacific's Coal Freight Business Chugs Ahead After Slowdown