Roak spoil removal system of mine surface is to ensure mine roak spoil removal requirement, and to realize a key link of coal production continued development of mines.

矿井地面排矸系统是保证矿井矸石排放需求，实现矿井煤炭生产持续稳定地增长的关键环节。

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Through the research on condition, form, character and factor of surface movement induced by exploiting coal. The paper discusses the surface deformation of some coal mines in Shanxi province.

本文通过对采煤后地表移动和破坏的破坏条件、形式、特性，影响因素等方面的研究，对山西省部分矿区的地表变形进行了论证。

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The entire switch without a moving contact surface has high explosion proof and waterproof function, meeting the requirement of chemical industries, coal mines, underwater, and milling working.

整个开关没有动接触面。所以具有较高的防爆防水性能。满足化工，煤矿、水下，制粉作业的要求。

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The company operates three surface coal mines in the Powder Region Basin (PRB) located in Montana and Wyoming, which is the lowest cost major coal producing region in the U.S. CLD also owns a 50% interest in Decker mine, which is also located in the PRB.

FORBES: Chinese Demand Will Drive This Wyoming Coal Stock

David Bolton, surface mines manager for UK Coal, said the disruption caused by the protest had halted work for three hours, costing the company "thousands of pounds".

BBC: Protester charged after Wrekin mine disruption

Today (July 14), Peabody announced a deal with the Xinjiang Uyghur Autonomous Region of China to develop a 50 million ton per year surface mine a giant project that would rank as one of the biggest coal mines in the world.

FORBES: Peabody Coal Is On Fire With New Deals