# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220063530014` · 12/13/2006 · 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

A short occurred causing the two 24 volt power supplies to trip out.  When the power supplies tripped this faulted the power to the analog control loops to several field devices.  The coal mill weigh belt stopped and the two tempering air dampers stopped.  An explosion occured in the #3 coal mill or ductwork causing the explosion vent to rupture as designed.

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