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    Underground coal mining accounts for 33% of the coal production in the United States. Of this, 51% of the production is produced by longwall mines (EIA, 2006). Approximately 45 longwalls are in operation at a given time

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    equipment Equipment NOTE: although the following sections deal with individual items of equipment in isolation it is noted a longwall face comprises a number of components that have to be fully integrated and work as a complete unit - they cannot be designed and installed in isolation from each other and be expected to operate successfully.

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    Longwall Top-Coal Caving: A productive and efficient alternative In the right conditions, longwall mining is one of the safest, most productive and most efficient ways to produce coal. This is owed in part to the high degree of automation employed by modern longwall operations, which keeps shearers and roof supports advancing smoothly and people …

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    Area lighting is also frequently included on the shearer, on maingate equipment and at remote pump stations and transformer installations. For a longwall to work at its best it should operate as near to continuously as possible, so high maintenance standards are desirable to minimize unplanned stoppages.

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    Methods of underground soft rock mining Longwall mining – A set of longwall mining equipment consists of a coal shearer mounted on conveyor operating underneath a series of selfadvancing hydraulic roof supports Almost the

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    Longwall mining, a form of underground mining designed to completely remove underground coal seams, results in land subsidence over large areas. As documented by reports describing subsidence impacts in Pennsylvania and elsewhere, longwall mining produces serious impacts to buildings, surface water supplies, aquifers. [11]

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