# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220120590037` · 11/12/2011 · Armstrong Cement & Supply Corp
## 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:** Snyder Associated Companies Inc
- **Operator:** Armstrong Cement & Supply Corp
- **Mine:** [3600215](https://api.ai-analytics.org/mine/3600215)
## Narrative

The relief vent on the #1 coal system was not rated properly for temperature.  We believe that the teflon film in the vent failed.  This caused the cyclone to lose its vacuum.  Somehow the erratic operation allowed the coal to ignite.

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