Coast Aggregates Big Rock Creek has $193K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
6
Years on record
2018–2024
Latest incident
May 2024
Compliance record
MSHA citations since 2016
150
citations
58
significant & substantial
$193,340
proposed penalties
$187,407
paid to date
97% of proposed penalties paid to date, a $5,933 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: 670 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
4
Section 107(a) orders
Most recent order: 2023-10-24.
On record since 2016.
Source: MSHA imminent-danger order records, updated weekly.
Coast Aggregates Big Rock Creek has $193K in proposed MSHA penalties and $0 outstanding across 1 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.
$193K
proposed penalties
$187K
current assessed
$187K
paid to date
$0
outstanding
146 assessments are final orders; 1 contested dockets.
Of $7K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2026-04-22.
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.
3citations taken to the federal commission · 2% of citations on record
Settled
3 · 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 1 decided S&S contests · industry: 79%
80%
Penalty reduction in decided contests
$7K proposed, $2K 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 2024-11-10.
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: 2023-03-22, 3 years ago
2
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg2
Show the individual readings (2)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-03-22
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-05-25
Respirable dust, <.1mg
0
Utility 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.
Coast Aggregates Big Rock Creek recorded 0.00 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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below 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 California, metal and nonmetal mining averaged 1.43 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 *
0.00
0.00
0.000
2024 *
3.00
3.00
0.000
2023 *
3.40
0.00
0.000
2022 *
3.21
0.00
0.000
2021 *
2.98
2.98
0.000
2020 *
0.00
0.00
0.000
2019 *
2.93
2.93
0.000
2018 *
3.86
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
34
2025
35
2024
31
2023
29
2022
30
2021
30
2020
29
2019
25
2018
23
2017
22
2016
10
Source: MSHA quarterly employment and production, updated weekly.
Coast Aggregates Big Rock Creek 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
21,664
4
2
184.6
2026 Q1
18,065
4
2
221.4
2025 Q4
21,435
0
0
0.0
2025 Q3
18,188
1
0
55.0
2025 Q2
21,310
3
0
140.8
2025 Q1
20,064
0
0
0.0
2024 Q4
20,099
9
1
447.8
2024 Q3
13,315
0
0
0.0
Show 33 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
17,460
5
0
286.4
2024 Q1
15,722
0
0
0.0
2023 Q4
16,231
12
4
739.3
2023 Q3
11,485
15
6
1306.1
2023 Q2
16,131
0
0
0.0
2023 Q1
14,914
4
1
268.2
2022 Q4
16,071
0
0
0.0
2022 Q3
17,283
3
1
173.6
2022 Q2
15,087
0
0
0.0
2022 Q1
13,932
11
3
789.5
2021 Q4
16,393
0
0
0.0
2021 Q3
17,383
16
8
920.4
2021 Q2
15,935
7
2
439.3
2021 Q1
17,495
16
9
914.5
2020 Q4
18,550
0
0
0.0
2020 Q3
19,009
0
0
0.0
2020 Q2
16,132
5
2
309.9
2020 Q1
16,311
9
6
551.8
2019 Q4
19,079
0
0
0.0
2019 Q3
16,738
0
0
0.0
2019 Q2
18,154
5
2
275.4
2019 Q1
14,356
7
2
487.6
2018 Q4
13,200
0
0
0.0
2018 Q3
13,217
0
0
0.0
2018 Q2
10,268
4
1
389.6
2018 Q1
15,173
0
0
0.0
2017 Q4
13,544
5
4
369.2
2017 Q3
12,478
0
0
0.0
2017 Q2
11,569
0
0
0.0
2017 Q1
8,948
0
0
0.0
2016 Q4
6,774
2
0
295.2
2016 Q3
6,106
0
0
0.0
2016 Q2
5,216
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
6 on file
2024 · 1 incident
May 10, 2024CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
While employee was moving a piece of steel and putting on the ground the metal ladder rolled back striking employee's shin. Employee sought no medical attention due to employee saying employee would be OK.
2023 · 1 incident
April 5, 2023CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
While pulling on a 30 mil. liner for new ponds being built, the strap broke free and individual fell to the ground. Miner in a lot of pain stating lower back hurt .
2022 · 1 incident
July 21, 2022CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanDISORDERS (PHYSICAL AGENTS)
While removing back plate covering screen, after taking nuts and washers off we did not know that the bolts were not welded on inside of screen. The weight of the plate caused the bolts to angle downward and the plate to slide off bolts smashing employee's left hand.