# HANDLING OF MATERIALS
> MSHA accident `220192000004` · 07/12/2019 · Mammoth Coal Co.
## Details
- **Degree of injury:** DAYS RESTRICTED ACTIVITY ONLY
- **Classification:** HANDLING OF MATERIALS
- **Accident type:** Struck by... NEC
- **Occupation:** Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
- **Activity:** Machine maintenance
- **Injury source:** METAL COVERS & GUARDS
- **Nature of injury:** CONTUSN,BRUISE,INTAC SKIN
- **Body part:** HAND (NOT WRIST OR FINGERS)
- **Days lost:** 0
- **Mine experience:** 24.35 years
## Operator
- **Controller:** Alpha Metallurgical Resources Inc
- **Operator:** Mammoth Coal Co.
- **Mine:** [4608110](https://api.ai-analytics.org/mine/4608110)
## Narrative

Piston from brake accumulator contacted employees hand unexpectedly as another mechanic was driving the piston out of the accumulator.

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