MSHA - Code of Federal Regulations - 30 CFR 71.101
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MSHA - Title 30 CFR
30 CFR § 71.101
Respirable dust standard when quartz is present.


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/m(sub)3).

Subpart C--Sampling Procedures

AUTHORITY: Secs. 101 and 103(h), Federal Mine Safety and Health Act of 1977, Pub. L. 91-173, as amended by Pub. L. 95-164, 91 Stat. 1291 and 1299 (30 U.S.C. 811 and 813(h))), unless otherwise noted.

SOURCE: 45 FR 80757, Dec. 5, 1980, unless otherwise noted.


For further information: See MSHA's Program Policy Manual