# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220070390009` · 02/02/2007 · Heidelberg Materials US Cement LLC
## Details
- **Degree of injury:** ACCIDENT ONLY
- **Classification:** IGNITION OR EXPLOSION OF GAS OR DUST
- **Accident type:** Accident type, without injuries
- **Occupation:** —
- **Activity:** —
- **Injury source:** —
- **Nature of injury:** —
- **Body part:** —
- **Days lost:** 0
- **Mine experience:** — years
## Operator
- **Controller:** Heidelberg Materials AG
- **Operator:** Heidelberg Materials US Cement LLC
- **Mine:** [1200063](https://api.morvs.ai/mine/1200063)
## Narrative

The #3 coal mill system went down loaded with coal due to a secondary firing fan motor failure at 7:45AM.  The motor was replaced, and when the operator began to ""bump"" the coal mill empty several hours later an explosion occurred in the coal mill circuit causing the pressure relief explosion vent to rupture.  No employee injuries or equipment damages occured.

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · MORVS · CC0 1.0*