# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220120230042` · 01/11/2012 · 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

On Wednesday, January 11th the #2 kiln and coal mill system were being shutdown to replace the tangential primary airline.  The kiln operator began to lower coal feed rate tonnage as is normal procedure in order to empty the coal mill.  When the coal mill feed rate was finally showing zero tons per hour the kiln operator received an alarm that the west explosion vent opened.

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