# FALLING/SLIDING/ROLLING MATERIALS
> MSHA accident `220030840021` · 03/05/2003 · Knife River Mountain Region
## Details
- **Degree of injury:** DAYS RESTRICTED ACTIVITY ONLY
- **Classification:** FALLING/SLIDING/ROLLING MATERIALS
- **Accident type:** Struck by rolling or sliding object
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Machine maintenance
- **Injury source:** LOOSE DIRT AND MUD
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** BACK (MUSCLES/SPINE/S-CORD/TAILBONE)
- **Days lost:** —
- **Mine experience:** 0.61 years
## Operator
- **Controller:** MDU Resources Group Inc
- **Operator:** Knife River Mountain Region
- **Mine:** [2401360](https://api.ai-analytics.org/mine/2401360)
## Narrative

EE WAS ADJUSTING TRAP BELT WHEN A FROZEN CHUNK FROM THE GRIZZLEY ROLLED DOWN THE BANK AND BUMPED THE BACK OF THE EE'S LEGS, CAUSING PAIN IN HIS BACK.

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