Mining Incidents

Corona Plant Metal/Non-Metal

CalMat Co · Surface
Controlled by Vulcan Materials Company
Corona, Riverside County, CA  ·  Active
MSHA Mine ID: 0405095

Corona Plant has $15K in proposed MSHA penalties and $165 outstanding across 2 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
31
Years on record
1991–2020
Latest incident
Oct 2020
Compliance record
MSHA citations since 2000
108
citations
16
significant & substantial
$15,014
proposed penalties
$13,204
paid to date
88% of proposed penalties paid to date, a $1,810 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
69
inspections on record
1,529
inspection hours
7.1
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.
108 citations across 1,529 inspection hours.
Source: MSHA inspections data, updated weekly.

Corona Plant has $15K in proposed MSHA penalties and $165 outstanding across 2 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.
$15K
proposed penalties
$13K
current assessed
$13K
paid to date
$165
outstanding
106 assessments are final orders; 2 contested dockets.
As of the most recent assessment on 2026-02-04.
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 17,833 0 0 0.0
2025 Q3 20,830 0 0 0.0
2025 Q2 21,236 0 0 0.0
2025 Q1 18,828 1 0 53.1
2024 Q4 22,939 0 0 0.0
2024 Q3 23,220 1 0 43.1
2024 Q2 23,983 0 0 0.0
2024 Q1 20,436 2 0 97.9
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 19,782 0 0 0.0
2023 Q3 19,456 1 1 51.4
2023 Q2 18,424 0 0 0.0
2023 Q1 11,848 0 0 0.0
2022 Q4 19,841 3 1 151.2
2022 Q3 19,434 0 0 0.0
2022 Q2 18,981 0 0 0.0
2022 Q1 22,056 0 0 0.0
2021 Q4 19,218 1 0 52.0
2021 Q3 20,400 1 0 49.0
2021 Q2 22,557 0 0 0.0
2021 Q1 19,462 0 0 0.0
2020 Q4 18,877 1 0 53.0
2020 Q3 21,159 0 0 0.0
2020 Q2 19,991 0 0 0.0
2020 Q1 22,237 0 0 0.0
2019 Q4 22,991 1 1 43.5
2019 Q3 25,911 0 0 0.0
2019 Q2 26,002 0 0 0.0
2019 Q1 21,142 0 0 0.0
2018 Q4 23,665 0 0 0.0
2018 Q3 24,084 0 0 0.0
2018 Q2 23,048 0 0 0.0
2018 Q1 22,953 0 0 0.0
2017 Q4 21,456 0 0 0.0
2017 Q3 21,186 1 0 47.2
2017 Q2 17,990 0 0 0.0
2017 Q1 18,982 2 0 105.4
2016 Q4 18,818 0 0 0.0
2016 Q3 21,770 0 0 0.0
2016 Q2 20,765 0 0 0.0
2016 Q1 22,083 1 0 45.3
2015 Q4 21,592 0 0 0.0
2015 Q3 22,680 0 0 0.0
2015 Q2 21,229 1 0 47.1
2015 Q1 21,645 0 0 0.0
2014 Q4 18,032 0 0 0.0
2014 Q3 19,541 0 0 0.0
2014 Q2 19,787 0 0 0.0
2014 Q1 18,526 0 0 0.0
2013 Q4 15,772 2 2 126.8
2013 Q3 16,776 0 0 0.0
2013 Q2 17,987 0 0 0.0
2013 Q1 15,546 0 0 0.0
2012 Q4 14,922 0 0 0.0
2012 Q3 15,971 0 0 0.0
2012 Q2 17,267 1 0 57.9
2012 Q1 16,021 0 0 0.0
2011 Q4 14,915 0 0 0.0
2011 Q3 16,598 1 0 60.2
2011 Q2 15,229 0 0 0.0
2011 Q1 14,976 0 0 0.0
2010 Q4 14,206 1 0 70.4
2010 Q3 16,827 0 0 0.0
2010 Q2 16,449 0 0 0.0
2010 Q1 17,319 2 2 115.5
2009 Q4 17,891 0 0 0.0
2009 Q3 18,500 0 0 0.0
2009 Q2 21,742 1 0 46.0
2009 Q1 21,796 0 0 0.0
2008 Q4 21,608 0 0 0.0
2008 Q3 23,053 0 0 0.0
2008 Q2 22,627 1 0 44.2
2008 Q1 22,526 3 0 133.2
2007 Q4 22,787 0 0 0.0
2007 Q3 25,818 4 0 154.9
2007 Q2 21,492 0 0 0.0
2007 Q1 17,562 0 0 0.0
2006 Q4 16,812 2 0 119.0
2006 Q3 18,726 20 1 1068.0
2006 Q2 18,515 0 0 0.0
2006 Q1 18,111 2 0 110.4
2005 Q4 17,575 0 0 0.0
2005 Q3 20,054 0 0 0.0
2005 Q2 19,156 1 0 52.2
2005 Q1 15,856 0 0 0.0
2004 Q4 16,699 2 0 119.8
2004 Q3 16,742 0 0 0.0
2004 Q2 17,424 4 0 229.6
2004 Q1 15,086 1 0 66.3
2003 Q4 16,684 0 0 0.0
2003 Q3 17,548 0 0 0.0
2003 Q2 15,617 0 0 0.0
2003 Q1 14,852 1 0 67.3
2002 Q4 14,566 0 0 0.0
2002 Q3 14,568 1 0 68.6
2002 Q2 14,849 2 0 134.7
2002 Q1 14,904 0 0 0.0
2001 Q4 17,411 0 0 0.0
2001 Q3 19,295 0 0 0.0
2001 Q2 19,124 3 0 156.9
2001 Q1 15,057 0 0 0.0
2000 Q4 14,447 0 0 0.0
2000 Q3 6,922 0 0 0.0
2000 Q2 7,840 35 8 4464.3
2000 Q1 12,923 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

31 on file

2020 · 1 incident

October 9, 2020 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver OTHER
CalMat Co · (Not Elsewhere Classified)

Independent hauler was experiencing symptoms of a heart attack and called EMS. EMS transported the hauler to the hospital. The MSHA investigator requested an MSHA 7000-1 be completed.

2014 · 1 incident

November 4, 2014 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech FIRE
CalMat Co · Contact with hot objects or substances

The employee sustained 2nd degree burns. The employee was using a cutting torch to cut a one inch thick steel plate on a fabrication table. The slag from the cutting bounced off of the table and ignited the employee's shirt resulting in 2nd degree burns to the left side of the abdomen. The employee was placed restricted duty on 11/5/14 which is being accommodated.

2009 · 1 incident

May 25, 2009 CA · Metal/Non-Metal miner, prospector, nec SLIP OR FALL OF PERSON
CalMat Co · Fall from machine

On 5/25/09 A trespasser/Non-Employee was fatally injured from an apparent fall from elevation. The trespasser/Non-Employee's death occurred in route to the hospital.

2008 · 1 incident

September 2, 2008 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
CalMat Co · Struck by... (Not Elsewhere Classified)

The employee went to the company clinic on 9/3/08 and was placed on restricted duty. A porta-power disconnect fitting came apart when pressurised and struck employee on his safety glasses, resulting in a corneal abrasion and contusion to R-eye.

2006 · 1 incident

June 2, 2006 CA · Metal/Non-Metal beltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor rider HANDLING OF MATERIALS
CalMat Co · Over-exertion in pulling or pushing objects

The employee went to see the company doctor on 6/7/2006 and was placed on restricted duty. The employee strained his lower back while lifting and carrying buckets during crusher sampling

2004 · 1 incident

August 20, 2004 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
CalMat Co · Over-exertion (Not Elsewhere Classified)

Employee went to see company doctor on 8/21/04 and was placed on restricted duty. Employee was placing various tools in a pile, wrench, screwdrivers, etc. and strained his lower back.

2003 · 2 incidents

September 19, 2003 CA · Metal/Non-Metal FIRE
CalMat Co · Accident type, without injuries

WHILE CUTTING BOLTS FROM DISCHARGE LIP WITH OXY-ACETYLEN TORCH. SLAG FELL ONTO CHUTE LINER CAUSING FIRE WHICH RESULTED IN PROPERTY DAMAGE.

May 8, 2003 CA · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey HANDLING OF MATERIALS
CalMat Co · Over-exertion (Not Elsewhere Classified)

EMULSION HOSE BECAME LODGED IN BOREHOLE. EE JERKED ON HOSE TO FREE IT AND HEARD POP IN HIS LOWER BACK.

2002 · 1 incident

March 13, 2002 CA · Metal/Non-Metal beltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor rider HANDTOOLS (NONPOWERED)
CalMat Co · Struck by... (Not Elsewhere Classified)

EE WAS USING A 20# SLEDGEHAMMER & KNOCKER WRENCH TO TIGHTEN JAW BOLTS; THE HAMMER WAS DEFLECTED CAUSING IT TO MISS THE WRENCH STRIKING FINGER CAUSING A FRACTURE & LACERATION TO L-INDEX FINGER. EE WENT TO SEE COMPANY DR ON 3/13/02 & WAS PLACED ON RESTRICTED DUTY.

2001 · 2 incidents

September 29, 2001 CA · Metal/Non-Metal welder (shop) MACHINERY
CalMat Co · Flash burns (welding)

EMPLOYEE WENT TO CLINIC ON 9/29/01 AND WAS RETURNED TO FULL DUTY AND RECEIVED PRESCRIPTION AND MEDICATION. EMPLOYEE WAS WELDING ON EXCAVATOR BUCKET WHEN HE RECEIVED FLASH BURN TO BOTH EYES.

June 21, 2001 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
CalMat Co · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS USING A KNIFE, CUTTING LEG OF SCREEN PANEL, PULLING KNIFE TOWARDS BODY AND KNIFE CONTACTED LEFT WRIST. EMPLOYEE WENT TO SEE DOCTOR ON 6-22-01, RECEIVED STITCHES AND WAS PLACED ON RESTRICTED DUTY.

1999 · 1 incident

July 19, 1999 CA · Metal/Non-Metal welder (shop) SLIP OR FALL OF PERSON
CalMat Co · Fall from machine

EXITING CRANE CAB, EE SLIPPED ON OIL GETTING OFF CRANE AND HURT HIS BACK.

1998 · 3 incidents

September 17, 1998 CA · Metal/Non-Metal welder (shop) MACHINERY
Calmat Company · Contact with hot objects or substances

EE CUTTING METAL WITH A TORCH WHEN HOSE CAME OFF CUASING BURNS TO LOWER LEFT ARM & ABDOMEN AREA

August 14, 1998 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Calmat Company · Struck by... (Not Elsewhere Classified)

EE WAS CUTTING TAPE OFF BOARD HOLDING BOARD WITH LEFT HAND AND HOLDING KNIFE WITH RIGHT HAND. KNIFE SLIPED, POINT OF KNIFE ENTERED LEFT HAND BETWEEN INDEX AND MIDDLE KNUCKLE.

April 10, 1998 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Calmat Company · Over-exertion (Not Elsewhere Classified)

EE WAS TRYING TO REMOVE LODGED ROCK FROM CONVEYOR WHEN HE SLIPPED AND SPRAINED HIS RIGHT ARM.

1997 · 2 incidents

November 19, 1997 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
Calmat Company · Flash burns (welding)

EMPLOYEE WAS STANDING NEXT TO A CO-WORKER THAT WAS WELDING AND RECEIVED FLASH BURN IN HIS EYES.

September 23, 1997 CA · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey OTHER
Calmat Company · Absorption of radiations, caustics, toxic and noxious substances

EE WAS CHOPPING WEEDS AROUND EXPLOSIVE MAGAZIE WHEN A BEE STUNG HIS RIGHT LOWER ARM/

1996 · 3 incidents

November 21, 1996 CA · Metal/Non-Metal clerk, timekeeper, office worker, director of sales HANDLING OF MATERIALS
Calmat Company · Caught in, under or between a moving and a stationary object

EMPLOYEE WAS OPENING A HEAVY WOODEN DOOR ON A STORAGE SHED AND HIS FINGER WAS CAUGHT BETWEEN THE DOOR AND A STEEL DOOR HASP (LOCK). THE WEIGHT OF THE DOOR CAUSED THE HASP TO PINCH HIS FINGER.

November 21, 1996 CA · Metal/Non-Metal drill operator HANDLING OF MATERIALS
Calmat Company · Over-exertion in lifting objects

WHILE ATTEMPTING TO EXTRACT A VALVE BODY THAT WAS IN AN AWKWARD POSITION, STRAINED RIGHT SHOULDER.

July 1, 1996 CA · Metal/Non-Metal grader operator, roadgrader operator MACHINERY
Calmat Company · Struck by flying object

EMP WAS UP ON DUST SILO SHUTTING OFF VALVE WHEN THE AIR LINE BROKE BLOWING DUST PARTICLES INTO HIS FACE AND EYES.

1995 · 4 incidents

August 29, 1995 CA · Metal/Non-Metal welder (shop) MACHINERY
Calmat Company · Over-exertion (Not Elsewhere Classified)

WHILE EE WAS CUTTING BROKEN ADAPTOR OFF CAT WITH TORCH, HE WAS HIT BY CHEST PAINS.

March 9, 1995 CA · Metal/Non-Metal welder (shop) MACHINERY
Calmat Company · Struck by flying object

EMPLOYEE WAS WELDING IN ROCK HOPPER USING AIR CHIPPER AND THE AIRBORNE DUST FROM THE CHIPPER FLEW INTO HIS RIGHT EYE.

March 2, 1995 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Calmat Company · Struck by falling object

EMPLOYEE WAS REMMOVING A ROCK A B-1 (OVERSIZE), THE CHAIN COME-A-LONG (3/4TON) CAME LOOSE LANDING ON EMPLOYEE'S FINGER CUTTING IT.

February 3, 1995 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Calmat Company · Struck by... (Not Elsewhere Classified)

WHILE ATTEMPTING TO REMOVE ROCK FROM JAMMED CHUTE, A ROCK BECAME LOOSE DROPPING FROM THE FEEDER AREA ONTO EE'S LEFT INDEX FINGER, CUTTING IT.

1994 · 3 incidents

October 25, 1994 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Calmat Company · Struck by... (Not Elsewhere Classified)

EE WAS REMOVING WEAR SEGMENTS FROM 988B BUCKET WITH A 1" IMPACT AIR GUN. THE PLOW BOLT FELL OUT OF KEYED SLOT AND STARTED SPINING WHICH CUT HIS ARM (WRIST).

October 1, 1994 CA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor MACHINERY
Calmat Company · Contact with hot objects or substances

EE WAS HOLDING A STEEL PLATE IN PLACE WHILE ANOTHER EE WAS WELDING, HIS ELBOW HIT THE WELDING TORCH CAUSING OXYGEN TO ESCAPE FROM THE WELDING SPARKS. THIS CAUSED THE TORCH TO BURN HIS LEFT ARM .

September 8, 1994 CA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor SLIP OR FALL OF PERSON
Calmat Company · Fall from machine

EMPLOYEE WAS CHECKING OUT A BROKEN SHAFT ON A FINISH SCREEN. WHEN HE CRAWLED OUT HE SLIPPED ON ROCKS ON BELT AND CAUGHT HIMSELF ON THE SCREEN WITH HIS LEFT ARM TO KEEP HIMSELF FROM FALLING AND PULLED MUSCLES IN HIS LEFT ARM.

1993 · 2 incidents

August 28, 1993 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Calmat Company · Struck by falling object

TIGHTENING CHAIN COME-ALONG ON DOZER TRACK WHEN STRUCK INBACK WITH FALLING CHAIN (END OF CHAIN-HOOK)

January 14, 1993 CA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
Calmat Company · Over-exertion in lifting objects

WHILE LIFTING ROCKS OUT OF TH EJAW CRUSEHR (WHICH WAS PLUGGED) EMPLOYEE PULLED MUSCLE IN LOWER BACK.

1992 · 1 incident

May 22, 1992 CA · Metal/Non-Metal FIRE
Calmat Company · Accident type, without injuries

NO INJURIES. BRUSH FIRE OF UNKNOWN ORIGIN STARTED ON COMPANY PROPERTY. FIRE DEPARTMENT RESPONDED. NO ACCESS TO FIRE AREA. FIRE ALLOWED TO BURN ITSELF OUT AFTER FIRE BREAKS WERE CUT WITH COMPAN Y BULLDOZER.

1991 · 1 incident

November 15, 1991 CA · Metal/Non-Metal drill operator MACHINERY
Calmat Company · Struck by rolling or sliding object

FINISHING HOLE REACHING DRILL CONTROLS STRUCK ON R CALF BY ROCK ROLLED DOWN THE SLOPE

For insurers, brokers, and safety consultants

The full compliance file on Corona Plant

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.