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active face adsorption airflow alloys anemometer anode aqua regia atomic absorption average borehole BuMines Bureau of Mines carbon carbonaceous material Carson Hill clay veins coalbed containing cubic yards cyanidation Darcy's law degasification deposits depth desorption detection limit detector determine developed diameter dust concentrations electrolyte equipment feet wide FIGURE flow fracture gas pressure geological gold extraction grade Heavy Metals Heavy Metals Program horizontal holes hydraulic mining inches instruments leaded red brass methanometer methods MIBK million mineralized Mother Lode Na0Cl NaOCl obtained oil shale operation ounce gold oxidation packers pellester percent permeability Pittsburgh coalbed Pocahontas pounds pressure gradients pressure measurements production Program Technical Progress properties pump recording methanometer respirable dust samples schist silver solder stoping surface Technical Progress Report temperature tensile tests tons underground ventilation vertical borehole Virgin volume yield strength zone