# EXPLOSIVES AND BREAKING AGENTS
> MSHA accident `220121320024` · 05/01/2012 · Cordero Mining LLC
## Details
- **Degree of injury:** ACCIDENT ONLY
- **Classification:** EXPLOSIVES AND BREAKING AGENTS
- **Accident type:** Accident type, without injuries
- **Occupation:** —
- **Activity:** —
- **Injury source:** —
- **Nature of injury:** —
- **Body part:** —
- **Days lost:** 0
- **Mine experience:** — years
## Operator
- **Controller:** Cloud Peak Energy Resources LLC
- **Operator:** Cordero Mining LLC
- **Mine:** [4800992](https://api.ai-analytics.org/mine/4800992)
## Narrative

A partially loaded cast blast pattern detonated unexpectedly when an adjacent cast blast pattern was fired. The two patterns were separated by a shot break consisting of two rows of empty drill holes. The unplanned detonation caused damage to a small equipment trailer and broke several windows on an unmanned overburden drill.

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