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The top documents tagged [coal pillar]
Pillar design in coal mines
16.284 views
Bulkhead Guidelines in Underground Mines
74 views
Underground Coal Mining Presentation_Dec 2011
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Coal Mine Serious Accident 2011-3 Operator: Excel Mining, LLC Mine: Mine No. 3 Accident Date: November 29, 2011 Injured: Travis w. Pigg Classification:
225 views