# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220130700038` · 03/09/2013 · 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

4:30pm we received an alarm that the East&West explosion vents on the #1 coal mill had opened. No personnel injuries or property damages. It was discovered that an accumulation of smoldering coal dust was foiund at the bottom of the mill. This was determined to be the source of the ignition. All parameters of the coal mill circuit were normal leading up to the vent doors opening.

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