30 C.F.R. § 71.101 Respirable dust standard when quartz is present.
Title 30 - Mineral Resources
When the respirable dust in the mine atmosphere of the active workings contains more than 5 percent quartz, the operator shall continuously maintain the average concentration of respirable dust in the mine atmosphere during each shift to which each miner is exposed at or below a concentration of respirable dust computed by dividing the percent of quartz into the number 10. Concentrations shall be expressed in milligrams per cubic meter of air as measured with an approved sampling device and in terms of an equivalent concentration determined in accordance with §71.206 (Approved sampling devices; equivalent concentrations). Example: The respirable dust associated with a designated work position contains quartz in the amount of 20%, Therefore, the average concentration of respirable dust in the mine atmosphere associated with that designated work position shall be continuously maintained at or below 0.5 milligrams of respirable dust per cubic meter of air (10/20=0.5 mg/m3 ).
Title 30: Mineral Resources
PART 71—MANDATORY HEALTH STANDARDS—SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart B—Dust Standards
§ 71.101 Respirable dust standard when quartz is present.
