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analysis aromatic hydrocarbons asbestos bbl/day BLACKSVILLE brush plug bulk density Bureau of Mines burning carbon chalcopyrite chemical coal dust coalbed coker oil concentrations conveyor belts copper extraction crude oil density detector dispersing agent distribution dump Effect expanding cement feet Feet/meters formation fracture traces hazard hvAb ignition incombustibles injection iron iron(II kerosine leach solution longwall magnetic fluids magnetite mass spectra material Metallurgy meter method minerals MINES TECHNICAL PROGRESS moisture neat cement neoprene nickel nickel extraction obtained oil production oleic acid operations oxide oxygen panel particle peptizing percent Pittsburgh Placed plugs plastic Program Technical Progress pyrite ratio recovery Research Center respirable mine dusts roasting roof falls room and pillar sacks saturation magnetization serpentine shown in figure solvent sulfation sulfuric acid surface TECHNICAL PROGRESS REPORT technique temperature tests tion toxic product tubing U.S. DEPARTMENT viscosity