# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220043650004` · 12/28/2004 · 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.ai-analytics.org/mine/1200063)
## Narrative

At 8:59 am there was an ingnition of coal dust within the #2 coal mill ductwork system.  There were no personal injuries or equipment damage.  The safety rupture disc worked as designed and relieved pressure from the system created by the explosion.  Foreign metal found in the coal mill is the suspected ignition source.

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