Mine geology work is a basic work in coal production. It could effect the mine recovery. So, it must strengthen mine geology work and reduce unreasonable coal loss.

矿井地质工作是煤矿生产的基础工作，地质工作的好与坏直接影响矿井的回收率。因此，必须加强矿井地质工作，减少煤炭的不合理损失。

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According to the coal mine safety regulations and the practical requirement of mine surveillance, a control system of the mine intelligent substation based on AT91SAM7X256 is designed.

依据《煤矿安全规程》并结合井下监测监控的实际需求，本文设计实现了一种基于AT91SAM 7x256微控制器的煤矿智能分站控制系统。

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Based on the construction of first grade intrinsic safety mine in Baode coal mine, the paper discussed mine intrinsic safety management system.

以神华神东煤炭集团公司保德煤矿建设本质安全管理体系一级矿井的经验，探讨煤矿本质安全管理体系。

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After several months, President Roosevelt invited coal mine owners and union leaders to a meeting in Washington.

VOA: special.2010.08.12

Want to explore a working coal mine and a World War Two submarine?

VOA: special.2009.01.12

In some cases,there was open war between labor activists and coal mine operators.

VOA: special.2009.09.07

Several generations before, the family had sold its private coal mine in exchange for shares of the coal company.

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But Arnulfo Velasquez, the owner of the coal mine, says he has all necessary insurance and the mine is not illegal.

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Stover, who was head of security at the Upper Big Branch Mine (operated by Performance Coal and owned by Massey Energy), was convicted of impeding the investigation of the mine explosion that killed 29 people on April 5, 2010.

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