Mining Incidents

Guernsey Quarry Metal/Non-Metal

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

Guernsey Quarry has $136K in proposed MSHA penalties and $0 outstanding across 6 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
19
Years on record
1985–2025
Latest incident
Mar 2025
Compliance record
MSHA citations since 2000
167
citations
26
significant & substantial
$135,644
proposed penalties
$86,209
paid to date
64% of proposed penalties paid to date, a $49,435 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
78
inspections on record
1,639
inspection hours
10.2
citations per 100 inspection hours
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.
167 citations across 1,639 inspection hours.
Source: MSHA inspections data, updated weekly.

Guernsey Quarry has $136K in proposed MSHA penalties and $0 outstanding across 6 contested dockets.

Penalty disposition
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$136K
proposed penalties
$86K
current assessed
$86K
paid to date
$0
outstanding
165 assessments are final orders; 6 contested dockets.
As of the most recent assessment on 2025-06-02.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Quarterly safety rates
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
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 6,281 0 0 0.0
2025 Q2 7,310 2 0 273.6
2025 Q1 6,594 1 0 151.7
2024 Q4 7,380 0 0 0.0
2024 Q3 6,840 0 0 0.0
2024 Q2 5,906 4 0 677.3
2024 Q1 5,741 0 0 0.0
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 7,195 2 0 278.0
2023 Q3 7,037 1 0 142.1
2023 Q2 7,684 0 0 0.0
2023 Q1 7,709 3 0 389.2
2022 Q4 6,746 0 0 0.0
2022 Q3 8,594 0 0 0.0
2022 Q2 8,469 2 0 236.2
2022 Q1 5,812 4 0 688.2
2021 Q4 7,560 0 0 0.0
2021 Q3 7,903 0 0 0.0
2021 Q2 8,270 6 0 725.5
2021 Q1 6,327 11 2 1738.6
2020 Q4 7,141 0 0 0.0
2020 Q3 7,106 0 0 0.0
2020 Q2 8,191 1 1 122.1
2020 Q1 7,370 0 0 0.0
2019 Q4 8,227 2 1 243.1
2019 Q3 8,589 5 1 582.1
2019 Q2 7,447 0 0 0.0
2019 Q1 5,773 5 0 866.1
2018 Q4 6,782 0 0 0.0
2018 Q3 5,949 0 0 0.0
2018 Q2 6,357 2 2 314.6
2018 Q1 4,984 0 0 0.0
2017 Q4 6,115 0 0 0.0
2017 Q3 7,985 3 0 375.7
2017 Q2 6,496 0 0 0.0
2017 Q1 4,975 5 1 1005.0
2016 Q4 6,675 0 0 0.0
2016 Q3 8,770 5 0 570.1
2016 Q2 7,434 0 0 0.0
2016 Q1 6,237 1 0 160.3
2015 Q4 8,230 0 0 0.0
2015 Q3 9,654 7 2 725.1
2015 Q2 9,354 0 0 0.0
2015 Q1 6,152 3 0 487.6
2014 Q4 7,022 0 0 0.0
2014 Q3 8,826 0 0 0.0
2014 Q2 9,103 2 1 219.7
2014 Q1 6,124 1 0 163.3
2013 Q4 8,063 0 0 0.0
2013 Q3 8,508 0 0 0.0
2013 Q2 7,431 0 0 0.0
2013 Q1 5,882 4 1 680.0
2012 Q4 7,432 0 0 0.0
2012 Q3 9,099 0 0 0.0
2012 Q2 10,391 0 0 0.0
2012 Q1 7,670 0 0 0.0
2011 Q4 10,133 18 6 1776.4
2011 Q3 11,779 7 2 594.3
2011 Q2 9,830 0 0 0.0
2011 Q1 5,214 1 0 191.8
2010 Q4 7,784 3 0 385.4
2010 Q3 13,077 6 0 458.8
2010 Q2 7,954 0 0 0.0
2010 Q1 4,791 6 1 1252.3
2009 Q4 9,697 0 0 0.0
2009 Q3 14,052 0 0 0.0
2009 Q2 14,645 1 0 68.3
2009 Q1 10,472 0 0 0.0
2008 Q4 11,911 1 0 84.0
2008 Q3 13,266 4 0 301.5
2008 Q2 14,643 0 0 0.0
2008 Q1 12,213 1 0 81.9
2007 Q4 15,004 0 0 0.0
2007 Q3 16,865 6 0 355.8
2007 Q2 16,731 0 0 0.0
2007 Q1 14,342 5 0 348.6
2006 Q4 14,631 0 0 0.0
2006 Q3 15,580 0 0 0.0
2006 Q2 14,390 0 0 0.0
2006 Q1 14,025 0 0 0.0
2005 Q4 12,920 2 1 154.8
2005 Q3 12,068 0 0 0.0
2005 Q2 11,601 2 0 172.4
2005 Q1 10,649 0 0 0.0
2004 Q4 12,443 0 0 0.0
2004 Q3 18,332 1 0 54.5
2004 Q2 15,100 1 0 66.2
2004 Q1 9,971 1 0 100.3
2003 Q4 10,122 0 0 0.0
2003 Q3 12,286 5 2 407.0
2003 Q2 13,296 1 0 75.2
2003 Q1 10,430 3 0 287.6
2002 Q4 12,128 0 0 0.0
2002 Q3 13,084 0 0 0.0
2002 Q2 12,412 6 0 483.4
2002 Q1 9,395 0 0 0.0
2001 Q4 8,410 0 0 0.0
2001 Q3 10,448 0 0 0.0
2001 Q2 10,200 0 0 0.0
2001 Q1 8,923 0 0 0.0
2000 Q4 8,871 0 0 0.0
2000 Q3 16,182 0 0 0.0
2000 Q2 14,039 0 0 0.0
2000 Q1 14,691 4 2 272.3
No fatalities recorded at this mine.

Reportable incidents

19 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.

1998 · 1 incident

June 3, 1998 WY · Metal/Non-Metal drill operator MACHINERY
Guernsey Stone Company · Caught in, under or between (Not Elsewhere Classified)

WHEN MOVING DRILL OFF SHOT DOWN DRILL ROAD, DRILL TRAVELED OVER A HUMP & A ROCK HIT BOTTOM OF TRAMPAD PINCHING FOOT BETWEEN PAD & DRILL.

1995 · 2 incidents

May 1, 1995 WY · Metal/Non-Metal drill operator EXPLOSIVES AND BREAKING AGENTS
Guernsey Stone Company · Struck by flying object

EMPLOYEES WERE SHOOTING ELECTRIC BLASTING CAPS BY SUBMERGING CAPS IN 6 FT WATER HOLE. EMPLOYEE'S CAP DID NOT GO IN WATER. FLYING METAL OFF CAP CUT INJURED'S LEFT CHEEK. REQUIRED STITCHES.

February 24, 1995 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Guernsey Stone Company · Caught in, under or between a moving and a stationary object

EMPLOYEE WAS INSTALLING ROLLER ON NW80D BALL MACHINE. WHILE INSTALLING ROLLER, IT SLIPPED OUT OF HIS HAND SMASHING HIS RIGHT MIDDLE FINGER TIP BETWEEN ROLLER AND THE OUTER TRAVEL SHAFT.

1991 · 2 incidents

June 3, 1991 WY · Metal/Non-Metal mechanic helper HANDLING OF MATERIALS
Guernsey Stone Company · Fall to lower level, (Not Elsewhere Classified)

TAKING OFF CATWALK HANDRAILS AND GUARDS CLIMBNG UP SIDE OF CONE TO HOOK TABLE GRABBED LOCKING RAILS IT TURNED AND LOST BALANCE FELL BACK STRIKING GUARD RAIL ON WAY INJ R HIP

1990 · 1 incident

April 10, 1990 WY · Metal/Non-Metal drill operator MACHINERY
Guernsey Stone Company · Caught in, under or between (Not Elsewhere Classified)

EMPLOYEE WAS DRILLING. AFTER CLEANING A PLUGGED BIT I.NAME RECOUPLED THE STEEL. IN DOING SO, HE GRABBED THE STEEL WITH HIS RIGHT HAND. THE MITTEN ON HIS RIGHT HAND BECAME ENTANGLED IN THE STEE L. BRUISED WRIST AND FOREARM.

1988 · 1 incident

August 11, 1988 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Guernsey Stone Company · Struck by... (Not Elsewhere Classified)

A NEW CONVEYOR BELT HAD BEEN INSTALLED, BUT TENSION WAS NEEDED ON THE BELT TO INSTALL FLEXCO FASTENERS. A PAIR OF PLIERS WAS CLAMPED ON TO THE BELT TO HOLD THE BELT. A CABLE COME ALONG WAS T IED TO THE PLIERS. THE PLIERS CAME LOOSE, TRAVELED UP THE BELT AND HIT EMPLOYEE ON THE NOSE.

1987 · 1 incident

March 14, 1987 WY · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler HANDLING OF MATERIALS
Guernsey Stone Company · Caught in, under or between (Not Elsewhere Classified)

THE EMPLOYEE WA8 ASSISTING WITH THE ASSEMBLY OF THE HEAD ON THE 4 FOOT CONE.HE CAUGHT HIS RIHGT THUMB BETWEEN THE HEAD AND THE ADJUSTING BRACKETALONG SIDE OF WHERE THE HEAD FITS.HIS RIGHT THUM B WAS CUT REQUI9ING STITCHES.

1985 · 1 incident

July 9, 1985 WY · Metal/Non-Metal drill operator HANDLING OF MATERIALS
Guernsey Stone Company · Struck by... (Not Elsewhere Classified)

DRILL STEEL WAS BEING LOADED ONTO A TRUCK BY ONE EMPLOYEE STEEL SLIPPED FROM HIS HANDS CAUSING INJURY TO LEFT MIDDLE FINGER

For insurers, brokers, and safety consultants

The full compliance file on Guernsey Quarry

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.