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Mine WorkingsRock MassMine WorkingCoal SeamsMiningUnderground MiningPhysical and Mechanical PropertiesMathematical ModelUnderground Coal GasificationTechnological ParametersGas HydratesMathematical ModelingCoal MiningRational ParametersCoal SeamMineral DepositsMining IndustryGeomechanical ModelRock Mass StressIron Ore