← MSHA accidents

MACHINERY

220262160002 · 07/30/2026 · Knife River Corporation Mountain West

Details

Degree of injury
NO DYS AWY FRM WRK,NO RSTR ACT
Classification
MACHINERY
Accident type
Struck by flying object
Occupation
Maintenance man, Mechanic, Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech
Activity
Hand tools (not powered)
Injury source
WRENCH
Nature of injury
FRACTURE,CHIP
Body part
MOUTH/LIP/TEETH/TONGUE/THROAT/TASTE
Days lost
0
Mine experience
0.27 years

Operator

Controller (parent)
Knife River Corporation
Operator
Knife River Corporation Mountain West
Mine
1002089

Narrative

An employee was tightening countersink allen bolts on a rock shelf for an impactor. TM was holding an allen wrench on the bolt head while another TM put an impact gun on the backside nut. Force of impact gun on the nut threw the allen wrench from TM's hand toward EE's mouth and fractured a tooth.

Source

Authoritative
MSHA Open Government Data
Machine
JSON-LD · Markdown