# MACHINERY
> MSHA accident `220233000010` · 10/20/2023 · Allegheny Metallurgical, LLC
## Details
- **Degree of injury:** DAYS AWAY FROM WORK ONLY
- **Classification:** MACHINERY
- **Accident type:** Struck by falling object
- **Occupation:** Section foreman, Bullgang foreman, Labor foreman, Leadman, Shift boss
- **Activity:** Set, Remove, Relocate props
- **Injury source:** UNDERGRD MINING MACHINES
- **Nature of injury:** FRACTURE,CHIP
- **Body part:** KNEE/PATELLA
- **Days lost:** 27
- **Mine experience:** 0.5 years
## Operator
- **Controller:** American Metals & Coal International Inc.; POSCO-NCR Coal Ltd; JAZ Ventu
- **Operator:** Allegheny Metallurgical, LLC
- **Mine:** [4609447](https://api.ai-analytics.org/mine/4609447)
## Narrative

Employee was installing roof screen when a piece of rock slid off the screen and struck the back of their left leg causing their knee to strike the roof bolting machine resulting in a fractured patella.  

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