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mei guo mei kuang de an quan guan li
Author(s): 
Pages: 36-40
Year: Issue:  1
Journal: Safety in Coal Mines

Keyword:  煤矿商品煤露天矿地质构造主要产煤国安全管理开采深度自然条件顶板煤层赋存;
Abstract: <正> 美国是世界上主要产煤国家之一,全国约有6000个煤矿,全国共有煤矿职工18万人左右。年生产原煤约9亿吨(其中商品煤8亿吨),居世界第一位.其中露天矿占产量的60%。美国煤矿自然条件较好,开采深度浅,煤层赋存条件好,地质构造简单,顶板良好,瓦
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