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Discussion on ventilation leakage law in gateway of room and pillar mining

WANG Shan-hai (Huangling Mining Company Ltd., Huangling 727307, China)  
With measurements of ventilation leakage in gateway of a room and pillar mining in Huangling No. 1 mine and the site practical experiences, the paper summarized the ventilation leakage law in the gateway of the room and pillar mining, which can be references to the mine site management.
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