Mining Incidents

Barnhart Quarry Metal/Non-Metal

Barnhart, Jefferson County, MO  ·  Active
MSHA Mine ID: 2302469

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Fatalities
0
Total incidents
9
Years on record
2015–2026
Latest incident
Mar 2026
Compliance record
MSHA citations since 2015
111
citations
23
significant & substantial
$23,116
proposed penalties
$22,298
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2025 Q4 18,886 0 0 0.0
2025 Q3 17,108 3 1 175.4
2025 Q2 15,332 0 0 0.0
2025 Q1 7,294 2 0 274.2
2024 Q4 16,707 0 0 0.0
2024 Q3 8,114 0 0 0.0
2024 Q2 10,251 6 1 585.3
2024 Q1 9,540 6 0 628.9
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

9 on file

2026 · 1 incident

March 16, 2026 MO · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
New Frontier Materials Operations Alpha, LLC · Over-exertion (Not Elsewhere Classified)

The cone crusher stopped working, the employee traveled out of the plant shack to turn off the belts in the plant. Upon returning back to the plant shack they experienced pain in their right knee. On 3.23.26 the employee received an injection in their knee making the injury reportable.

2024 · 2 incidents

September 24, 2024 MO · Metal/Non-Metal barge/boat/dredge/towbarge/towboat/leach operator, riverman, deck hand SLIP OR FALL OF PERSON
New Frontier Materials Operations Alpha, LLC · Fall to the walkway or working surface

The employee completed spraying/cleaning underneath the tail end of the sand conveyor, when they lost their footing, causing them to fall down the embankment.

February 27, 2024 MO · Metal/Non-Metal barge/boat/dredge/towbarge/towboat/leach operator, riverman, deck hand HANDLING OF MATERIALS
New Frontier Materials Operations Alpha, LLC · Struck by... (Not Elsewhere Classified)

Employee was standing on stationary barge helping to take slack out of a line, to tie off a barge. The tension built causing the line to come off the timber head striking the employee in the left leg near the knee.

2022 · 1 incident

April 22, 2022 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Simpson Materials Company, LLC · Struck by flying object

Hydraulic ram used to break back tire bead slipped off rear rim flange and hit technician in head. Knocked off hard hat, broke safety glasses.

2021 · 2 incidents

November 3, 2021 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Simpson Materials Company, LLC · Struck by powered moving object

Service truck rolled forward and pinned employee's leg against a hopper feeder.

June 2, 2021 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Simpson Materials Company, LLC · Caught in, under or between a moving and a stationary object

2 employees working, one running skid steer, pulling axle from beneath crusher. Injured person reached beneath axle, and other employee accidentally moved skid steer forward and pinned injured person's hand. Bone between wrist and knuckle on little finder was broken.

2019 · 1 incident

2018 · 1 incident

November 20, 2018 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Simpson Materials Company, LLC · Struck by... (Not Elsewhere Classified)

Individual sustained fractured left fibula and injured right shoulder after being knocked off a barge into the river. Coworkers state the individual was hit by a cable on the left leg, which knocked EE down into the water between two barges.

2015 · 1 incident

April 30, 2015 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Simpson Materials Company, LLC · Caught in, under or between a moving and a stationary object

Employee was setting a conveyor in place with a crane when his hand was pinched.