Metal and Nonmetal National Mine Rescue Contest Rules

GLOSSARY OF TERMSACCESSIBLE - Able to be traveled into; not impassable.ADIT - A nearly horizontal passage from the surface bywhich a mine is entered.AIR LOCK - An area in the mine closed at both ends bytwo doors or two bulkheads. An air lock is used toprevent mixing of different atmospheres while stillpermitting miners to enter and exit.AIR SHAFT - Shaft used exclusively for conducting air.AIR SPLIT - The division of an air current into two ormore parts.AIR TRACK DRILL - A heavy drill mounted on crawlertracks.AIRWAY - Any passage through which air is flowing.ALTERNATE - Person qualifying to participate as a minerescue team member. Can replace any team member whocannot continue or who is removed from the problem.ASSISTANT – Optional seventh person who may assistthe fresh air base attendant but is not eligible tosubstitute for another team member including the freshair base attendant.ATMOSPHERIC PRESSURE - Force exerted by air.Atmospheric pressure is measured on a barometer.AUXILIARY FAN - A small, por ta ble fan used to sup ple -ment the ven ti la tion of an in di vid ual work ing place.AUXILIARY VENTILATION - Portion of mainventilating current directed to face of dead-end entry bymeans of an auxiliary fan and tubing.BACK FILL - The rough material used to refill a placefrom which the earth has been removed.BACK/ROOF - That part of an opening which is nearestthe surface in relation to any portion of the workings ofthe mine, the roof. Overhead surface of an undergroundopening.94