abandoned mineabandoned workingabrasiveabsolute humidityabsolute roughnessabsorptionabsorption methodabutmentabutment loadabutment pillarsabyssal zoneaccess roadaccessory mineralsaccretion veinaccumulationaccuracyacetylene lampacicularacid base indicatoracid batteryacid complexesacid leachingacid mine drainageactinide elementsactivated carbonactivationactivation energyactivatoractive spanactive supportactive workingsactivityadditiveadditive indexadhesionadhesive weightadiabatic processaditadit leveladjuvantadsorbateadsorbentadsorptionadsorption factoradsorption methodadvanceadvance rateadvance strippingadvanced gateadvancing longwall method
