Eight Days After Accident, MSHA Cites Inadequate Rock Dust At Upper Big Branch

MSHA last Tuesday issued a citation to the Performance Coal Co. Upper Big Branch Mine – South, alleging insufficient measures to control explosive coal dust before the fatal April 5 explosion.

The April 13 citation was based on a sample taken March 15 – three weeks before the fatal accident. The time required for lab analysis of such samples creates a lag in obtaining results.

An MSHA inspector took eight dust samples from mine surfaces on March 15, the citation stated. “One out of eight samples taken were less than 80 per centum of combustible [sic] content,” read the text of the citation, in a printout from MSHA’s computer system obtained by Mine Safety and Health News.

MSHA alleged that the mine violated standard 75.403. The standard specifies that incombustible content of underground coal mine surfaces required to be rock dusted must be at least 65% in general, 80% in return air courses, and still higher – according to a formula – for each 0.1% methane present.

The samples were taken on Mechanized Mining Unit 029-0, according to the citation. A detailed mine map provided by MSHA indicated that that 029-0 was the number of the unit engaged in developing a new area for future longwall mining.

In issuing the citation – 8 days after the blast – MSHA characterized the alleged violation as “reasonably” likely to cause up to 30 deaths. Negligence by the mine operator was characterized as “low,” however.

The April 5 accident remains under investigation, and whether the alleged violation could have actually contributed remains undetermined.

MSHA also on April 13 issued a withdrawal order to the Upper Big Branch Mine under section 104(b) for alleged failure to correct a previously cited violation within the time allowed, the agency database showed.

MSHA did not respond today to a request for specifics on the alleged uncorrected violation.

Update: Initial post said “10 days.” Corrected shortly after posting.

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