# FALL OF ROOF OR BACK
> MSHA accident `220113320014` · 11/20/2011 · Bonanza Explorations, Inc.
## Details
- **Degree of injury:** DAYS AWAY FROM WORK ONLY
- **Classification:** FALL OF ROOF OR BACK
- **Accident type:** Struck by falling object
- **Occupation:** Apprentice, Trainee
- **Activity:** Roof bolter, NEC
- **Injury source:** DRILL STEEL (ALL SIZES)
- **Nature of injury:** CONTUSN,BRUISE,INTAC SKIN
- **Body part:** LEG, NEC
- **Days lost:** 4
- **Mine experience:** — years
## Operator
- **Controller:** American Bonanza Gold Corporation
- **Operator:** Bonanza Explorations, Inc.
- **Mine:** [0203000](https://api.ai-analytics.org/mine/0203000)
## Narrative

Miner was placing a 10' drill steel into a pre-drilled 6' hole. The miner was holding the steel when a rock approx. 4' x 4' x 3' began to fall in the area of the drill hole. The miner retreated as the steel bearing the weight of the rock hit the back of the knee and knocked him to the ground.

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