# MACHINERY
> MSHA accident `220181150004` · 04/19/2018 · Lafarge North America
## Details
- **Degree of injury:** NO DYS AWY FRM WRK,NO RSTR ACT
- **Classification:** MACHINERY
- **Accident type:** Over-exertion NEC
- **Occupation:** Laborer, Blacksmith, Bull gang, Parts runner, Roustabout, Pick-up man, Pitman
- **Activity:** Hand tools (powered)
- **Injury source:** DRIL-PRCUSV,HRD ROC,JKHMR
- **Nature of injury:** SPRAIN,STRAIN RUPT DISC
- **Body part:** BACK (MUSCLES/SPINE/S-CORD/TAILBONE)
- **Days lost:** 0
- **Mine experience:** 0.1 years
## Operator
- **Controller:** Holcim Ltd
- **Operator:** Lafarge North America
- **Mine:** [2000044](https://api.ai-analytics.org/mine/2000044)
## Narrative

Employee was jackhammering debris when the chisel point dropped through the grate and caused the jackhammer to jerk back.

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