# IGNITION OR EXPLOSION OF GAS OR DUST
> MSHA accident `220040340008` · 01/29/2004 · Westmoreland San Juan Mining 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:** —
- **Mine experience:** — years
## Operator
- **Controller:** BHP Billiton
- **Operator:** Westmoreland San Juan Mining LLC
- **Mine:** [2902170](https://api.ai-analytics.org/mine/2902170)
## Narrative

DURING INSTALLATION OF A TORQUE TENSION ROOF BOLT, THE OPERATOR OBSERVED AN ORANGE GLOW AROUND THE BOLT HOLE. ROCKDUST WAS THROWN ON THE AREA. GAS TESTS FOLLOWING THE EVENT INDICATED A METHANE CONTENT OF .2%. THE ROOF WAS UNEVEN IN THIS LOCATION CAUSING EXTRA FRICTION BETWEEN THE BOLT AND THE STRAP.

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