Acton Clay Quarries has $18K in proposed MSHA penalties and $0 outstanding across 16 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
8
Years on record
1999–2026
Latest incident
Feb 2026
Compliance record
MSHA citations since 2000
99
citations
19
significant & substantial
$18,373
proposed penalties
$11,765
paid to date
64% of proposed penalties paid to date, a $6,608 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.
99 citations across 1,027 inspection hours.
Source: MSHA inspections data, updated weekly.
Acton Clay Quarries has $18K in proposed MSHA penalties and $0 outstanding across 16 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.
$18K
proposed penalties
$12K
current assessed
$12K
paid to date
$0
outstanding
99 assessments are final orders; 16 contested dockets.
Of $11K in penalties contested before the Commission, $5K was upheld in final decisions.
As of the most recent assessment on 2026-04-01.
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.
13citations taken to the federal commission · 13% of citations on record
Settled
11 · 85%
Stood as issued
1 · 8%
Vacated or withdrawn
1 · 8%
50%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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%
18%
Penalty reduction in decided contests
$2K proposed, $1K 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 2017-02-27.
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: 2023-08-24, 3 years ago
0%
of limit-tested samples over the exposure limit
12
samples
2
limit-tested
Most sampled contaminants
Respirable dust, <.1mg4
Unlisted Particulate, respirable, <1% Qtz4
Unlisted Particulate, total, <1% Qtz2
Nuisance dust, total, <1% Qtz1
Show the individual readings (12)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-08-24
Respirable dust, <.1mg
0
Crusher Oper/Worker
2022-05-03
Respirable dust, <.1mg
0
Front-end Loader Operator
2019-06-05
Respirable dust, <.1mg
0
Front-end Loader Operator
2013-09-12
Unlisted Particulate, respirable, <1% Qtz
0.54
Front-end Loader Operator
2013-09-12
Unlisted Particulate, respirable, <1% Qtz
0.42
Bulldozer Operator
2013-09-12
Respirable dust, <.1mg
0
Crusher Oper/Worker
2005-07-20
Nuisance dust, total, <1% Qtz
0.82
10
0.08
Front-end Loader Operator
2005-07-20
Unlisted Particulate, total, <1% Qtz
4.96
Front-end Loader Operator
2005-07-20
Unlisted Particulate, total, <1% Qtz
4.5
Laborer, Bullgang
2002-08-14
Unlisted Particulate, respirable, <1% Qtz
0.97
Truck Driver
2002-08-14
Quartz, respirable, >1% Qtz
0.74
2.87
0.26
Front-end Loader Operator
2002-08-14
Unlisted Particulate, respirable, <1% Qtz
0.13
Front-end Loader Operator
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.
Acton Clay Quarries recorded 0.00 reportable injury cases per 100 full-time workers in 2015.
Injury rate, 2015
ⓘ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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 2.26 and the all-US-mining average was 2.72 cases per 100 workers.
In California, metal and nonmetal mining averaged 2.21 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
2015 *
0.00
0.00
0.000
2007 *
0.00
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
10
2025
10
2024
9
2023
9
2022
10
2021
9
2020
10
2019
10
2018
10
2017
10
2016
10
2015
10
2014
10
2013
10
2012
9
2011
7
2010
6
2009
7
2008
9
2007
11
2006
10
2005
11
2004
8
2003
8
2002
9
2001
7
2000
8
Source: MSHA quarterly employment and production, updated weekly.
Acton Clay Quarries sits in Los Angeles County, California, where the Census mining category is 0.0% 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.
Los Angeles County, California · Population 9,848,406
0.0%
Mining share of county employment
$87,760
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
4,034
1
0
247.9
2026 Q1
3,835
0
0
0.0
2025 Q4
4,212
3
1
712.3
2025 Q3
3,832
0
0
0.0
2025 Q2
3,887
0
0
0.0
2025 Q1
3,726
0
0
0.0
2024 Q4
4,404
1
0
227.1
2024 Q3
4,231
1
1
236.4
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
4,530
0
0
0.0
2024 Q1
3,912
0
0
0.0
2023 Q4
3,964
0
0
0.0
2023 Q3
4,537
1
0
220.4
2023 Q2
4,257
0
0
0.0
2023 Q1
4,119
0
0
0.0
2022 Q4
4,864
0
0
0.0
2022 Q3
4,174
0
0
0.0
2022 Q2
4,307
1
0
232.2
2022 Q1
3,892
1
0
256.9
2021 Q4
4,019
0
0
0.0
2021 Q3
4,556
2
1
439.0
2021 Q2
4,461
0
0
0.0
2021 Q1
4,073
0
0
0.0
2020 Q4
4,330
2
1
461.9
2020 Q3
4,374
1
1
228.6
2020 Q2
3,978
0
0
0.0
2020 Q1
3,900
3
0
769.2
2019 Q4
3,900
0
0
0.0
2019 Q3
4,655
0
0
0.0
2019 Q2
4,376
3
0
685.6
2019 Q1
4,294
2
0
465.8
2018 Q4
3,915
0
0
0.0
2018 Q3
3,782
0
0
0.0
2018 Q2
4,542
1
0
220.2
2018 Q1
4,246
1
1
235.5
2017 Q4
4,252
0
0
0.0
2017 Q3
4,337
1
0
230.6
2017 Q2
4,274
0
0
0.0
2017 Q1
4,061
0
0
0.0
2016 Q4
4,393
5
1
1138.2
2016 Q3
5,679
0
0
0.0
2016 Q2
4,507
2
0
443.8
2016 Q1
4,868
0
0
0.0
2015 Q4
4,882
1
0
204.8
2015 Q3
5,674
1
0
176.2
2015 Q2
5,433
0
0
0.0
2015 Q1
4,034
0
0
0.0
2014 Q4
5,579
1
0
179.2
2014 Q3
4,925
0
0
0.0
2014 Q2
4,563
0
0
0.0
2014 Q1
4,341
1
0
230.4
2013 Q4
4,580
0
0
0.0
2013 Q3
5,274
0
0
0.0
2013 Q2
4,466
0
0
0.0
2013 Q1
4,479
0
0
0.0
2012 Q4
4,839
1
0
206.7
2012 Q3
4,507
0
0
0.0
2012 Q2
3,748
0
0
0.0
2012 Q1
3,397
1
1
294.4
2011 Q4
4,015
0
0
0.0
2011 Q3
3,287
1
0
304.2
2011 Q2
2,877
1
1
347.6
2011 Q1
2,519
0
0
0.0
2010 Q4
2,398
0
0
0.0
2010 Q3
2,710
0
0
0.0
2010 Q2
2,491
0
0
0.0
2010 Q1
2,739
4
2
1460.4
2009 Q4
2,837
0
0
0.0
2009 Q3
3,236
0
0
0.0
2009 Q2
3,054
0
0
0.0
2009 Q1
3,227
0
0
0.0
2008 Q4
4,313
0
0
0.0
2008 Q3
4,378
0
0
0.0
2008 Q2
4,202
0
0
0.0
2008 Q1
4,360
0
0
0.0
2007 Q4
5,226
0
0
0.0
2007 Q3
5,653
0
0
0.0
2007 Q2
5,092
0
0
0.0
2007 Q1
4,949
0
0
0.0
2006 Q4
4,642
0
0
0.0
2006 Q3
5,439
0
0
0.0
2006 Q2
4,741
0
0
0.0
2006 Q1
4,049
0
0
0.0
2005 Q4
4,565
0
0
0.0
2005 Q3
5,539
0
0
0.0
2005 Q2
4,863
0
0
0.0
2005 Q1
4,599
0
0
0.0
2004 Q4
4,113
0
0
0.0
2004 Q3
4,374
0
0
0.0
2004 Q2
3,301
0
0
0.0
2004 Q1
3,442
0
0
0.0
2003 Q4
3,703
0
0
0.0
2003 Q3
4,161
2
0
480.7
2003 Q2
3,155
0
0
0.0
2003 Q1
3,048
0
0
0.0
2002 Q4
3,575
0
0
0.0
2002 Q3
4,592
2
0
435.5
2002 Q2
3,956
0
0
0.0
2002 Q1
3,705
0
0
0.0
2001 Q4
3,685
0
0
0.0
2001 Q3
3,447
2
0
580.2
2001 Q2
3,125
0
0
0.0
2001 Q1
3,125
0
0
0.0
2000 Q4
3,396
0
0
0.0
2000 Q3
3,279
0
0
0.0
2000 Q2
3,711
39
8
10509.3
2000 Q1
3,169
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
8 on file
2026 · 1 incident
February 10, 2026CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerSLIP OR FALL OF PERSON
Was standing on a step ladder refueling a Dozer. With both feet on the last rung of the ladder, EE went to stepping off with left leg. EE's boot got stuck on the ladder and EE lost balance causing EE to fall. EE fell backwards and struck an oil container then landed on left side on the floor.
EE REPORTED THE NEXT DAY SHOULDER WAS HURTING AND WILL NOT BE COMING TO WORK. EE STATES RIGHT SHOULDER BEGAN HURTING PROGRESSIVELY MORE TO THEEND OF SHIFT. HE DOES NOT KNOW WHAT CAUSED IT.
2001 · 1 incident
January 30, 2001CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerPOWERED HAULAGE
ON MONDAY, WE RECEIVE NOTIFICATION FROM EE'S HOUSEHOLD THAT EE WOULD NOT BE IN TO WORK BECAUSE HE HAD INJURED HIS BACK. LATER IN A T/C HE SAID HE HAD HURT HIS BACK THE PRIOR TUESDAY MOVING CUT TING EDGES WITH A LOADER. HOSPITAL T/C TODAY SAID DIAGNOSIS IS BACK SPRAIN, AND THEY ANTICIPATE HIS RETURN TO DUTY IN A WEEK.
2000 · 1 incident
August 9, 2000CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDTOOLS (NONPOWERED)
EMPLOYEE SUFFERED BRUISES, AND CUT HIS HEAD REQUIRING STITCHES. THISHAPPENED WHEN HIS HAMMER SLIPPED WHILE HE WAS GETTING SOME METALLIC OBSTRUCITON OUT OF A CRUSHER WHILE THE PLANT WAS SHUT D OWN, HE LOST HIS BALANCE AND FELL OFF THE CRUSHER PLATFORM.
1999 · 2 incidents
August 17, 1999CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
EE SLIPPED OFF BADGER NO 88 AND KEEP WORKING MENTIONED HE FELL OFF LOADER NEXT WEEK. WENT TO DR IN MARCH BUT DID NOT TAKE ANY TIME FROM WORK. FINALLY ON JULY 1999 HE CEASED WORK BECAUSE OF COM PLAINTS HE RELATED TO THE NOV 1988 FALL. HIS LAST DAY OF WORK WAS JULY 12, 1999.