25 Pa. Code § 208.71 – Maintenance of incombustible content of rock dust.

(a) Where rock dust is required to be applied, it shall be distributed upon the top, floor and sides of the underground areas of a coal mine and maintained in quantities so that the incombustible content of the combined coal dust, rock dust and other dust is not less than 80%.
(b) Where methane is present in a ventilating current, the percent of incombustible content of the combined dust as required under subsection (a) shall be increased 0.4% for each 0.1% of methane.
(c) Moisture in the combined coal dust, rock dust and other dusts shall be considered as a part of the incombustible content of the mixture.

The provisions of this § 208.71 issued under sections 106 and 106.1 of the Bituminous Coal Mine Safety Act (52 P. S. § § 690-106 and 690-106.1).

The provisions of this § 208.71 adopted December 13, 2013, effective December 14, 2013, 43 Pa.B. 7275.