Mining Incidents

PLANT #5 Metal/Non-Metal

ONYX MATERIALS · Surface
corona, Riverside County, CA  ·  Active
MSHA Mine ID: 0405451

PLANT #5 has $13K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

Watch this mine

Email me when a new MSHA incident is filed at PLANT #5.

Fatalities
0
Total incidents
2
Years on record
2006–2007
Latest incident
Dec 2007
Compliance record
MSHA citations since 2000
76
citations
13
significant & substantial
$13,282
proposed penalties
$13,282
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
49
inspections on record
538
inspection hours
n/a
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: 538 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

PLANT #5 has $13K 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.
$13K
proposed penalties
$13K
current assessed
$13K
paid to date
$0
outstanding
75 assessments are final orders; 1 contested dockets.
As of the most recent assessment on 2025-11-19.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
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
2025 Q4 700 2 0 2857.1
2025 Q3 700 1 0 1428.6
2025 Q2 700 0 0 0.0
2025 Q1 700 4 1 5714.3
2024 Q4 700 0 0 0.0
2024 Q3 1,202 1 0 831.9
2024 Q2 929 0 0 0.0
2024 Q1 1,079 4 1 3707.1
Show 83 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 1,583 0 0 0.0
2023 Q3 1,611 6 1 3724.4
2023 Q2 1,498 0 0 0.0
2023 Q1 1,397 0 0 0.0
2022 Q4 1,511 5 2 3309.1
2022 Q3 1,910 0 0 0.0
2022 Q2 2,054 4 1 1947.4
2022 Q1 1,815 0 0 0.0
2021 Q4 1,755 0 0 0.0
2021 Q3 1,950 4 0 2051.3
2021 Q2 1,755 0 0 0.0
2020 Q3 1,650 0 0 0.0
2020 Q2 1,950 0 0 0.0
2020 Q1 1,430 1 0 699.3
2019 Q4 1,200 0 0 0.0
2019 Q2 1,680 0 0 0.0
2019 Q1 1,040 0 0 0.0
2018 Q4 1,950 0 0 0.0
2018 Q3 2,210 0 0 0.0
2018 Q2 2,038 0 0 0.0
2018 Q1 2,022 2 0 989.1
2017 Q4 1,698 0 0 0.0
2017 Q3 450 0 0 0.0
2017 Q2 930 0 0 0.0
2016 Q1 220 0 0 0.0
2015 Q4 524 0 0 0.0
2015 Q2 315 0 0 0.0
2015 Q1 840 0 0 0.0
2014 Q4 110 1 0 9090.9
2014 Q3 480 0 0 0.0
2014 Q2 1,020 0 0 0.0
2014 Q1 1,478 0 0 0.0
2013 Q4 2,574 0 0 0.0
2013 Q3 2,730 0 0 0.0
2013 Q2 2,047 0 0 0.0
2013 Q1 1,461 0 0 0.0
2012 Q4 1,469 0 0 0.0
2012 Q3 1,534 0 0 0.0
2012 Q2 216 0 0 0.0
2011 Q4 130 0 0 0.0
2011 Q1 550 0 0 0.0
2010 Q4 1,170 0 0 0.0
2010 Q3 585 0 0 0.0
2010 Q2 585 0 0 0.0
2010 Q1 1,170 0 0 0.0
2009 Q4 1,690 3 0 1775.1
2009 Q3 1,170 0 0 0.0
2009 Q2 1,755 0 0 0.0
2009 Q1 880 1 0 1136.4
2008 Q4 2,184 1 0 457.9
2008 Q3 3,120 0 0 0.0
2008 Q2 3,575 0 0 0.0
2008 Q1 3,932 0 0 0.0
2007 Q4 3,250 4 1 1230.8
2007 Q3 2,640 0 0 0.0
2007 Q2 3,120 0 0 0.0
2007 Q1 3,432 0 0 0.0
2006 Q4 3,575 7 0 1958.0
2006 Q3 1,610 3 1 1863.4
2006 Q2 0 0 0
2006 Q1 1,350 0 0 0.0
2005 Q4 1,525 0 0 0.0
2005 Q3 240 0 0 0.0
2005 Q2 480 0 0 0.0
2005 Q1 0 0 0
2004 Q4 1,170 0 0 0.0
2004 Q3 0 0 0
2004 Q2 390 0 0 0.0
2004 Q1 720 0 0 0.0
2003 Q4 600 0 0 0.0
2003 Q3 500 0 0 0.0
2003 Q2 520 0 0 0.0
2003 Q1 480 0 0 0.0
2002 Q4 780 9 2 11538.5
2002 Q3 500 0 0 0.0
2002 Q2 720 3 1 4166.7
2002 Q1 780 0 0 0.0
2001 Q4 203 4 1 19704.4
2001 Q3 150 0 0 0.0
2001 Q2 203 0 0 0.0
2001 Q1 90 0 0 0.0
2000 Q4 70 2 0 28571.4
2000 Q3 860 3 1 3488.4
No fatalities recorded at this mine.

Reportable incidents

2 on file

2007 · 1 incident

December 4, 2007 CA · Metal/Non-Metal ledgeman/hand, quarry man POWERED HAULAGE
Soil Binder · Struck by... (Not Elsewhere Classified)

Got hit in the head with knuckle boom on boom truck. Worker was too close to boom during operation. 4 stitches required for small cut on forehead.

2006 · 1 incident

October 12, 2006 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
Soil Binder · Unclassified, insufficient data

The miner was hit on the head and received a scrape on the arm approximately 1"x 2". His head required 4 stitches. It is unknown what contributed to the accident the miner does not remember and there was no witnesses. I assumed he either fell or was hit by a bar while prying on something.

For insurers, brokers, and safety consultants

The full compliance file on PLANT #5

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.