Mining Incidents

PLANT #5 Metal/Non-Metal

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

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Fatalities
0
Total incidents
2
Years on record
2006–2007
Latest incident
Dec 2007
Compliance record
MSHA citations since 2000
75
citations
13
significant & substantial
$13,282
proposed penalties
$13,282
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
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
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
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.