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If your operation is a surface mine, new employees must receive 24 hours of training -- Part 46 New Miner Training. For those who work in shell dredging, sand, gravel, surface stone, surface clay, colloidal phosphate, or surface limestone mines, or Part 48B Surface New Miner Training. If your operation is underground, new employees must receive 40 hours of training under Part 48A New Miner Training. For more information see the Mine Safety and Health Administration Web site at www.msha.gov.