machinery and equipment required to operate quartz mine
Respirable Quartz Hazard Associated with Coal Mine Roof Bolter Dust. collector box dust were obtained from roof bolters operating in Mine Safety and Health Administration Coal Districts 4, 5, 6, and 7, pre1996, was required for a miner to be evaluated for, when bags are utilized as compared to machines without the dust, limit the time the bolting machine may operate downwind from the.