Greenstone Materials Quarry has $43K in proposed MSHA penalties and $265 outstanding across 2 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
24
Years on record
1983–1996
Latest incident
Apr 1996
Compliance record
MSHA citations since 2000
81
citations
19
significant & substantial
$42,560
proposed penalties
$24,284
paid to date
57% of proposed penalties paid to date, a $18,276 gap.
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.
Rate withheld: 542 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Greenstone Materials Quarry has $43K in proposed MSHA penalties and $265 outstanding across 2 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.
$43K
proposed penalties
$25K
current assessed
$24K
paid to date
$265
outstanding
81 assessments are final orders; 2 contested dockets.
Of $23K in penalties contested before the Commission, $5K was upheld in final decisions.
As of the most recent assessment on 2026-03-10.
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.
4citations taken to the federal commission · 5% of citations on record
Settled
4 · 100%
0%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 3 decided S&S contests · industry: 79%
79%
Penalty reduction in decided contests
$23K proposed, $5K 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 2023-03-15.
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: 2024-11-07
0%
of limit-tested samples over the exposure limit
4
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg3
Quartz, respirable, >1% Qtz1
Show the individual readings (4)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2024-11-07
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2023-12-07
Respirable dust, <.1mg
0
Front-end Loader Operator
2015-02-12
Quartz, respirable, >1% Qtz
0.36
0.72
0.50
Front-end Loader Operator
2015-02-12
Respirable dust, <.1mg
0
Scale Man
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
4
2025
4
2024
3
2023
3
2022
3
2021
3
2020
4
2019
3
2018
4
2017
4
2016
3
2015
3
2014
5
2011
1
2000
8
Source: MSHA quarterly employment and production, updated weekly.
Greenstone Materials Quarry sits in Orange County, California, where the Census mining category is 0.1% 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.
Orange County, California · Population 3,164,063
0.1%
Mining share of county employment
$113,702
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
2,006
0
0
0.0
2026 Q1
2,007
3
0
1494.8
2025 Q4
1,854
0
0
0.0
2025 Q3
1,854
0
0
0.0
2025 Q2
1,976
2
0
1012.1
2025 Q1
1,660
0
0
0.0
2024 Q4
1,488
2
0
1344.1
2024 Q3
1,588
0
0
0.0
Show 47 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
1,512
1
0
661.4
2024 Q1
1,512
0
0
0.0
2023 Q4
1,512
3
1
1984.1
2023 Q3
1,512
0
0
0.0
2023 Q2
1,511
4
0
2647.3
2023 Q1
1,342
4
0
2980.6
2022 Q4
1,565
0
0
0.0
2022 Q3
1,565
0
0
0.0
2022 Q2
2,080
4
0
1923.1
2022 Q1
1,538
7
1
4551.4
2021 Q4
1,333
0
0
0.0
2021 Q3
1,538
0
0
0.0
2021 Q2
1,333
2
0
1500.4
2021 Q1
1,333
1
0
750.2
2020 Q4
1,535
0
0
0.0
2020 Q3
1,333
2
0
1500.4
2020 Q2
1,333
0
0
0.0
2020 Q1
1,337
0
0
0.0
2019 Q4
1,333
0
0
0.0
2019 Q3
1,535
0
0
0.0
2019 Q2
1,135
1
1
881.1
2019 Q1
1,200
3
0
2500.0
2018 Q4
2,112
0
0
0.0
2018 Q3
2,112
0
0
0.0
2018 Q2
1,620
3
0
1851.9
2018 Q1
1,920
4
0
2083.3
2017 Q4
1,920
0
0
0.0
2017 Q3
1,620
8
6
4938.3
2017 Q2
1,620
0
0
0.0
2017 Q1
1,920
4
0
2083.3
2016 Q4
1,880
0
0
0.0
2016 Q3
1,920
2
0
1041.7
2016 Q2
850
0
0
0.0
2016 Q1
720
1
0
1388.9
2015 Q4
1,632
4
2
2451.0
2015 Q3
840
0
0
0.0
2015 Q2
880
0
0
0.0
2015 Q1
1,250
5
3
4000.0
2014 Q4
2,112
0
0
0.0
2014 Q3
2,117
0
0
0.0
2014 Q2
2,027
6
4
2960.0
2014 Q1
2,029
0
0
0.0
2011 Q4
976
0
0
0.0
2011 Q3
640
1
1
1562.5
2011 Q1
0
0
0
2000 Q2
3,346
3
0
896.6
2000 Q1
3,928
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
24 on file
1996 · 1 incident
April 5, 1996CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
EMPLOYEE WAS CUTTING WIPER WITH RAZOR KNIFE AND WAS HOLDING IT WITH HIS RIGHT HAND (EMPLOYEE IS LEFT-HANDED); THE KNIFE SLIPPED AND CUT HIM ACROSS HIS RIGHT HAND.
1988 · 1 incident
November 17, 1988CA · Metal/Non-Metaloutside foreman, leadmanPOWERED HAULAGE
Ortega Rock Quarry · Caught in, under or between a moving and a stationary object
EMPLOYEE WAS UNLOADING A SCREEN FROM A TRUCK LOADER BUCKET WAS RESTING ON A RAIL ABOVE THE SCREEN EMPLOYEE RESACHED UP TO THE TOP OF THE SCREEN & RAIL BROKE & LOADER BUCKET DROPPED ON TO THE SCREEN CATCHING HIS FINGER BETWEEN
1987 · 2 incidents
April 21, 1987CA · Metal/Non-Metaloutside foreman, leadmanMACHINERY
EMPLOYEE WAS PU5LING A SCREEN OFF THE #2 SHAKER WHEN HE BECAME ANGRY WITH ANOTHER EMPLOYEE AND THREW THE SCREEN OFF THE SHAKER ONTO THE GROUND THEREBY APPARENTLY STRAINING HIS BACK
1986 · 2 incidents
July 15, 1986CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
WHILE BREAKING ROCK OUT OF JAW CRUSHER ANOTHER ROCK ROLLED AND HIT FOOT.
September 25, 1984CA · Metal/Non-Metalhaul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driverSLIP OR FALL OF PERSON
Ortega Rock Quarry · Caught in, under or between (Not Elsewhere Classified)
WHILE GETTING OUTOF TRUCK HAND SLIPPED IN BETWEEN CAB AND HANDRAIL.
August 27, 1984CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
EMPLOYEE WAS WATERING HAUL ROAK WHEN STEERING BNBOUND UP. TARUCK WAS ON INCLINE AND HEADED FOR A CANYON. EMPLOYEE COULD NOT GET TRUCK STOPPED IN T IME AND JUMPED OUT TO AVOID RIDING OFF INTO C ANYON BELOW. TRUCK CAME TO S TOP ON BRIM.
August 17, 1984CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanPOWERED HAULAGE
Ortega Rock Quarry · Caught in, under or between (Not Elsewhere Classified)
EMPL LAYING ON CONVEYOR BELT UNDER CONE CRUSHER TIGHTENING HOSE CLAMP.PLANT OPERATOR TOLD TO TURN OFF ALL OTHER EQUIP.IN DOING SO HE PUSHED WRONG BUTTON AND STARTED CONVEOYR.
June 1, 1984CA · Metal/Non-Metalhaul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driverHANDLING OF MATERIALS
September 13, 1983CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorMACHINERY
Ortega Rock Company · Caught in, under or between running or meshing objects
ROCK STUCK IN CONVEYOR PULLEY.EMPL TURNED CONVEOYOR BACKWARDS WITH VEE BELTS.ROCK CAME OUT OF COVEYOR BELT,EMPL PULLING ON BELTS-FINGER WENT IN DRIVE BELT PULLEY,CUT OFF END OF FINGER OF LEFT HAND.
August 23, 1983CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSTEPPING OR KNEELING ON OBJECT