# INUNDATION
> MSHA accident `220100070009` · 01/02/2010 · Tilden Mining Company L C
## Details
- **Degree of injury:** ACCIDENT ONLY
- **Classification:** INUNDATION
- **Accident type:** Accident type, without injuries
- **Occupation:** —
- **Activity:** —
- **Injury source:** —
- **Nature of injury:** —
- **Body part:** —
- **Days lost:** 0
- **Mine experience:** — years
## Operator
- **Controller:** U.S. Steel Canada; Cliffs Natural Resources Inc
- **Operator:** Tilden Mining Company L C
- **Mine:** [2000422](https://api.ai-analytics.org/mine/2000422)
## Narrative

The sight glass area in the 1 1/2 vent line has 4 bolts that hold a glass tube in place. The bolts all snapped and the glass tube broke.  Operators smelled gas, closed main gas valve and vented building.  Followed up with air monitoring equipment to verify acceptable range.

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