Research On One Borehole Hydraulic Coal Mining System

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Methane is recovered from an underground coal seam via a borehole which extends ... A hydraulic mining device ... Energy conserving mining system and method

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Beijing Mining Research Institute of China Coal Research Institute, Beijing Mining Technology ... system of mining coal permeability realized the real time monitoring.

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At least one borehole is driven from the surface into a selected coal seam wherein a plurality of cavities are formed. The coal walls intermediate said cavities ...

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