# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220113410031` · 12/01/2011 · 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 8:35 pm the kiln operator received an alarm that the #1 coal mill system vents opened.  The kiln and coal mill system were shutdown.  During the investigation it was discovered that the coal mill inlet duct was hot (surface steel).  An accumulation of coal dust had accumulated at the inlet duct and began to smolder causing an ignition source in the system.

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