All of your employees who work in underground mines must receive Part 48A Training and Retraining for Miners. All of your employees who work at surface areas of underground mines must receive Part 48B Training and Retraining for Miners. Your employees who work in shell dredging, sand, gravel, surface stone, surface clay, colloidal phosphate, or surface limestone mines must attend Part 46 Training and Retraining of Miners.
