# SLIP OR FALL OF PERSON
> MSHA accident `220120550012` · 02/21/2012 · Northshore Mining Company
## Details
- **Degree of injury:** DAYS RESTRICTED ACTIVITY ONLY
- **Classification:** SLIP OR FALL OF PERSON
- **Accident type:** Fall onto or against objects
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Hand tools (not powered)
- **Injury source:** METAL COVERS & GUARDS
- **Nature of injury:** UNCLASSIFIED,NOT DETERMED
- **Body part:** SHOULDERS (COLLARBONE/CLAVICLE/SCAPULA)
- **Days lost:** 0
- **Mine experience:** 8 years
## Operator
- **Controller:** Cleveland-Cliffs Inc
- **Operator:** Northshore Mining Company
- **Mine:** [2100831](https://api.ai-analytics.org/mine/2100831)
## Narrative

Employee was loosening nuts on the trunion of a ball mill.  He was using a 16 lb. sledgehammer and 2.5 in. slug wrench.  The hardware was very tight and he had hit one of the nuts several times with the sledgehammer.  The last time he hit that nut, it loosened and he lost his footing.  His body flew into the mill and he felt shoulder pain.  That evening the pain worsened.

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