A coal mine flood that took place at 11:40 pm Saturday in Changzhi in Shanxi has trapped 13 people, the local work safety authority confirmed Sunday.

山西负责安全生产的官员13日说，12日深夜发生在长治市的煤矿透水事故已经造成井下13人被困。

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Afghan miners work in a coal mine 100 km east of the western city of Herat on June 26, 2010 in Afghanistan.

6月26日，阿富汗矿工在西赫拉特市以东100公里的煤矿。

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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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Mr Thomas said water in any mine would be a risk but when the mine operator applies for a licence to work a particular reserve of coal, there is a national database with records showing where that seam had been worked before.

BBC: Gleision Colliery near Cilybebyll: Brief history