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.
Of $102K in penalties contested before the Commission, $52K was upheld in final decisions.
As of the most recent assessment on 2025-06-02.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘShares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘContesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
26citations taken to the federal commission · 16% of citations on record
Settled
22 · 85%
Stood as issued
2 · 8%
Vacated or withdrawn
2 · 8%
80%
S&S designation survived the contest
ⓘCounts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 10 decided S&S contests · industry: 79%
49%
Penalty reduction in decided contests
$102K proposed, $52K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2025-08-19.
Contested penalties
ⓘA reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Health sampling
ⓘA sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.
Metal and nonmetal contaminants (personal samples)
ⓘMany samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2026-03-16
23%
of limit-tested samples over the exposure limit
33
samples
22
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz225 over
Respirable dust, <.1mg4
Cristobalite, respirable2
Nuisance dust, respirable, <1% Qtz2
Show the individual readings (33)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2003-08-27
Quartz, respirable, >1% Qtz
0.51
0.34
1.50
Crusher Oper/Worker
2003-01-23
Quartz, respirable, >1% Qtz
2.08
1.03
2.02
Crusher Oper/Worker
2003-01-23
Quartz, respirable, >1% Qtz
0.78
0.41
1.90
Crusher Oper/Worker
2002-04-17
Quartz, respirable, >1% Qtz
1.19
0.33
3.61
Crusher Oper/Worker
2002-04-17
Quartz, respirable, >1% Qtz
1.18
0.33
3.58
Crusher Oper/Worker
2026-03-16
Unlisted Particulate, total, <1% Qtz
0
Utility Man
2026-03-16
Unlisted Particulate, total, <1% Qtz
0
Front-end Loader Operator
2024-05-15
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2024-05-15
Quartz, respirable, >1% Qtz
0.25
Laborer, Bullgang
2024-05-15
Respirable dust, <.1mg
0
Truck Driver
2019-07-24
Quartz, respirable, >1% Qtz
1.91
1.92
0.99
Laborer, Bullgang
2019-07-24
Quartz, respirable, >1% Qtz
0.7
1.81
0.39
Laborer, Bullgang
2017-07-19
Quartz, respirable, >1% Qtz
0.27
1.95
0.14
Laborer, Bullgang
2017-07-19
Quartz, respirable, >1% Qtz
0.52
2.57
0.20
Laborer, Bullgang
2016-08-10
Quartz, respirable, >1% Qtz
0.39
1.27
0.31
Laborer, Bullgang
2016-08-10
Quartz, respirable, >1% Qtz
0.39
1.42
0.27
Front-end Loader Operator
2014-05-07
Quartz, respirable, >1% Qtz
0.19
1.41
0.13
Truck Driver
2014-05-07
Quartz, respirable, >1% Qtz
0.21
1.83
0.11
Crusher Oper/Worker
2014-05-07
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-04-22
Cristobalite, respirable
0
Crusher Oper/Worker
2009-04-22
Nuisance dust, respirable, <1% Qtz
0.25
10
0.03
Crusher Oper/Worker
2009-04-22
Nuisance dust, respirable, <1% Qtz
0.07
10
0.01
Front-end Loader Operator
2009-04-22
Cristobalite, respirable
0
Front-end Loader Operator
2007-02-14
Quartz, respirable, >1% Qtz
0.13
0.51
0.25
Dry Screen Plant Operator
2007-02-14
Quartz, respirable, >1% Qtz
0.55
0.86
0.64
Crusher Oper/Worker
2007-02-14
Quartz, respirable, >1% Qtz
0.15
0.76
0.20
Front-end Loader Operator
2004-04-13
Unlisted Particulate, respirable, <1% Qtz
0.36
Front-end Loader Operator
2004-01-07
Quartz, respirable, >1% Qtz
0.28
Crusher Oper/Worker
2004-01-07
Quartz, respirable, >1% Qtz
0.3
0.45
0.67
Crusher Oper/Worker
2004-01-07
Respirable dust, <.1mg
0.03
Crusher Oper/Worker
2003-08-27
Quartz, respirable, >1% Qtz
0.36
0.77
0.47
Crusher Oper/Worker
2002-04-17
Quartz, respirable, >1% Qtz
0.54
1.24
0.44
Drill Operator, Rotary
2002-04-17
Quartz, respirable, >1% Qtz
0.24
0.77
0.31
Complete Load-Haul-Dump
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Guernsey Quarry recorded 7.45 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘThis rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
7.45
total case rate
0.00
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Wyoming, metal and nonmetal mining averaged 1.96 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year
total case rate
days-away
fatal
2025 *
7.45
0.00
0.000
2024 *
0.00
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
6.65
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
0.00
0.00
0.000
2018 *
8.31
0.00
0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
16
2025
13
2024
12
2023
13
2022
13
2021
15
2020
13
2019
13
2018
12
2017
12
2016
12
2015
13
2014
14
2013
15
2012
16
2011
16
2010
19
2009
22
2008
24
2007
27
2006
25
2005
22
2004
25
2003
21
2002
23
2001
20
2000
27
Source: MSHA quarterly employment and production, updated weekly.
Guernsey Quarry sits in Platte County, Wyoming, where the Census mining category is 0.4% of county employment.
Local economic context
ⓘCounty figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Platte County, Wyoming · Population 8,606
0.4%
Mining share of county employment
$66,299
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
2026 Q2
8,746
0
0
0.0
2026 Q1
7,295
0
0
0.0
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
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
5,906
3
0
508.0
2024 Q1
5,741
0
0
0.0
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
0
0
0.0
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
6
2
621.5
2015 Q2
9,354
0
0
0.0
2015 Q1
6,152
2
0
325.1
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
2
0
340.0
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, 2025WY · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanOTHER
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, 2021WY · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSLIP OR FALL OF PERSON
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.
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.
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, 2008WY · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
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, 2006WY · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerDISORDERS (REPEATED TRAUMA)
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, 2006WY · Metal/Non-Metalbelt foreman, maintenance foreman, maintenance supervisorHANDLING OF MATERIALS
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, 2004WY · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
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, 2000WY · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
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, 1995WY · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
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.
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
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, 1988WY · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDTOOLS (NONPOWERED)
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, 1987WY · Metal/Non-Metalgreaser, grease man, oiler, lube man, dragline oilerHANDLING OF MATERIALS
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.