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Martin Marietta Southern California Aggregates,LLC: 1,474 MSHA citations operator

Controlled by Martin Marietta Materials Inc
MSHA operator ID: L17823

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Fatalities
0
Total incidents
307
Mines on record
32
Years on record
1988–2025
Compliance record
MSHA citations since 2000
1,474
citations
251
significant & substantial
$408,353
proposed penalties
$387,202
paid to date
95% of proposed penalties paid to date, a $21,151 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
829
inspections on record
15,535
inspection hours
9.5
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.
1,474 citations across 15,535 inspection hours.
Source: MSHA inspections data, updated weekly.
Penalty disposition
ⓘ Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$408K
proposed penalties
$387K
current assessed
$387K
paid to date
$155
outstanding
1,465 assessments are final orders; 51 contested dockets.
Of $64K in penalties contested before the Commission, $38K was upheld in final decisions.
As of the most recent assessment on 2026-06-24.
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.
17.1%
significant & substantial
6.0%
high negligence or reckless
17.2%
reasonably likely or greater
41.9%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 17.3% low, 76.7% moderate, 6.0% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
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.
1.08
total case rate
1.08
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.
Year total case rate days-away fatal
2026 * 0.00 0.00 0.000
2025 1.08 1.08 0.000
2024 2.35 0.00 0.000
2023 0.00 0.00 0.000
2022 0.85 0.00 0.000
2021 0.00 0.00 0.000
2020 1.03 0.15 0.000
2019 1.45 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.
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: 2025-08-12
7%
of limit-tested samples over the exposure limit
312
samples
116
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz938 over
  • Respirable dust, <.1mg175
  • Nuisance dust, respirable, <1% Qtz17
  • Unlisted Particulate, respirable, <1% Qtz11
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.
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.
123 citations taken to the federal commission · 8% of citations on record
  • Settled 103 · 84%
  • Stood as issued 20 · 16%
77%
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 65 decided S&S contests · industry: 79%
35%
Penalty reduction in decided contests
$59K proposed, $38K 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 2023-06-04. Vacated and withdrawn citations are removed from the file this view attributes through, so that outcome is slightly undercounted here.
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 operator contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Docket Decision Judge Year Proposed / upheld
CENT 2019-0343 Settlement Lewis 2020 $9K → $3K
CENT 2017-0018 Settlement Lesnick 2017 $6K → $6K
CENT 2017-0331 Default Lesnick 2017 $4K → $4K
CENT 2014-0625 Settlement Lesnick 2015 $3K → $3K
CENT 2012-170M Settlement Lesnick 2012 $3K → $745
CENT 2016-0465 Settlement Manning 2016 $2K → $746
Source: FMSHRC civil penalty dockets and decisions (public record), updated weekly.

Top causes

Incident timeline

2025
1
2024
2
2022
2
2020
8
2019
13
2018
10
2017
15
2016
10
2015
13
2014
15
2013
17
2012
12
2011
17
2010
11
2009
14
2008
19
2007
18
2006
19
2005
23
2004
33
2003
1
2000
1
1998
3
1997
1
1996
4
1995
2
1994
3
1993
7
1992
5
1991
2
1990
2
1989
3
1988
1

Mines on record

For insurers, brokers, and safety consultants

Where Martin Marietta Southern California Aggregates,LLC stands on silica, penalties, and injury rate

MSHA's standard limits respirable silica to 50 micrograms per cubic metre, but MSHA publishes dust and quartz as separate files and never the silica figure itself. We derive it per sample, score it against the limit, and set the operator's injury rate against a benchmark built from the full MSHA operator record. With the 26-year penalty trail, contest posture, and fatality history. Delivered as a PDF with the underlying data as CSV.

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