# MACHINERY
> MSHA accident `220130070029` · 12/28/2012 · BHP Navajo Coal Company
## Details
- **Degree of injury:** NO DYS AWY FRM WRK,NO RSTR ACT
- **Classification:** MACHINERY
- **Accident type:** Over-exertion NEC
- **Occupation:** Welder (shop)
- **Activity:** Hand tools (powered)
- **Injury source:** HAND TOOLS,POWERED,NEC
- **Nature of injury:** FRACTURE,CHIP
- **Body part:** HAND (NOT WRIST OR FINGERS)
- **Days lost:** 0
- **Mine experience:** 0.02 years
## Operator
- **Controller:** BHP Billiton
- **Operator:** BHP Navajo Coal Company
- **Mine:** [2900097](https://api.ai-analytics.org/mine/2900097)
## Narrative

Employee forgot his key to his tool box lock. He did not have access to his tools to work for the day.  He decided to use a 1/2"" chuck electric drill and 3/8"" drill bit to drill out the lock. While drilling, the bit bound up and twisted his hands. The twisting fractured the 4th metacarpal on his right hand.

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