Mining Incidents

Guernsey Quarry Metal/Non-Metal

Guernsey, Platte County, WY  ·  Active
MSHA Mine ID: 4800004

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Fatalities
0
Total incidents
10
Years on record
2000–2025
Latest incident
Mar 2025
Compliance record
MSHA citations since 2000
167
citations
26
significant & substantial
$135,644
proposed penalties
$86,209
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 6,657 0 0 0.0
2025 Q3 2,701 0 0 0.0
2025 Q2 4,898 2 0 408.3
2025 Q1 659 1 0 1517.5
2024 Q4 2,435 0 0 0.0
2024 Q3 2,257 0 0 0.0
2024 Q1 1,895 0 0 0.0
2023 Q4 7,195 2 0 278.0
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

10 on file

2025 · 1 incident

March 18, 2025 WY · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman OTHER
Martin Marietta Materials Inc · Struck by flying object

03/18/2025 Employee was standing near the Deister screen when the wind blew dirt into the employee's right eye. First Aid measures were provided on site. The employee was seen by a Banner Health clinic on 03/18/2025. Prescription eye drops were prescribed by the physician. The employee did not have any lost time or restrictions.

2021 · 1 incident

September 13, 2021 WY · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Martin Marietta Materials Inc · Caught in, under or between (Not Elsewhere Classified)

The injured employee was performing maintenance on a bearing for the P-1 conveyor when right foot slipped into a gap between the conveyor frame and the concrete retaining wall. The injured employee's body turned to one side causing a twisting injury to the right knee.

2018 · 1 incident

October 19, 2018 WY · Metal/Non-Metal welder (shop) SLIP OR FALL OF PERSON
Martin Marietta Materials Inc · Fall onto or against objects

On Friday, October 19, 2018, a welder/mechanic was walking through a shop when they tripped on a welding cart outside of the welding bay, resulting in a fall. The EE fell onto a piece of angle iron that was on the weld cart, causing a laceration to their hand. The EE was taken to the emergency room where they received 6-8 stitches.

2016 · 1 incident

December 6, 2016 WY · Metal/Non-Metal driller, highwall operator, highwall drill operator HANDTOOLS (NONPOWERED)
Martin Marietta Materials Inc · Struck by... (Not Elsewhere Classified)

An employee was attempting to connect a light plant trailer to the hitch on a pickup when EE used a bar vise to strike the tongue of the trailer hitch, missing and pinching EE's finger.

2008 · 1 incident

July 15, 2008 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Rinker Materials Western Inc · Over-exertion (Not Elsewhere Classified)

Employee was removing rock from stopped jaw crusher when he had a little discomfort in his lower abdomen. He thought it was just a strained muscle.

2007 · 1 incident

October 24, 2007 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Rinker Materials Western Inc · Flash burns (welding)

This employee and another were welding in the welding shop. Employee went home and started experiencing pain in both eyes. He went to the doctor at 12:00 am and was told he had flash burns to both eyes.

2006 · 2 incidents

November 21, 2006 WY · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer DISORDERS (REPEATED TRAUMA)
Rinker Materials Western Inc · Over-exertion (Not Elsewhere Classified)

Employee stated she was having pain in her right shoulder and left wrist. She states the pain is from years of repeated motion due to operating a wheel loader.

January 5, 2006 WY · Metal/Non-Metal belt foreman, maintenance foreman, maintenance supervisor HANDLING OF MATERIALS
Rinker Materials Western Inc · Caught in, under or between (Not Elsewhere Classified)

Folding D-10 dozer track for shipment. While folding tracks master link folded under to far. Employee straightend master link with right hand. At this point his left hand was between track pads. The tracks flatened cutting and breaking three fingers on his left hand.

2004 · 1 incident

November 9, 2004 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Rinker Materials Western Inc · Struck by falling object

Employee was changing sheer bolt in feeder through access door when door came unlatched and fell striking employee on his right hand.

2000 · 1 incident

April 11, 2000 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Guernsey Stone Company · Over-exertion (Not Elsewhere Classified)

STEPPED OFF CHIPS SCREEN ONTO CATWALK AND ROLLED ANKLE.