Mining Incidents

Mayhew Plant Metal/Non-Metal

Corona, Riverside County, CA  ·  Active
MSHA Mine ID: 0403871

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Fatalities
0
Total incidents
13
Years on record
2000–2020
Latest incident
Apr 2020
Compliance record
MSHA citations since 2000
166
citations
52
significant & substantial
$51,780
proposed penalties
$51,518
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 8,618 3 1 348.1
2025 Q2 8,124 0 0 0.0
2025 Q1 7,801 0 0 0.0
2024 Q2 0 0 0
2024 Q1 0 0 0
2023 Q4 0 1 0
2023 Q3 0 0 0
2023 Q2 0 0 0
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

13 on file

2020 · 1 incident

April 20, 2020 CA · Metal/Non-Metal rotary bucket excavator operator OTHER
MAMR LLC DBA Maitri Road Recycling · (Not Elsewhere Classified)

Miner was operating an excavator (Cat 385) when they experienced a seizure. Coworker in a truck (Cat 745C) arrived to load and notice the excavator boom extended instead of in loading position and saw the operator in the cab leaning against the window. Coworker found the excavator operator to be unconscious and turned off the excavator. Coworker called supervisor and 911.

2014 · 1 incident

June 24, 2014 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator OTHER
MAMR LLC DBA Maitri Road Recycling · (Not Elsewhere Classified)

Employee complained of nausea and asked to go home. Other employees recognized symptoms consistent with a heart attack, and called 911. It was later determined that the employee did suffer a heart attack.

2010 · 1 incident

October 6, 2010 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Cemex Construction Materials Pacific LLC · Struck by rolling or sliding object

EE was cutting a piece of 6" channel steel at the steel rack behind the shop. He lifted the channel up and shored it with another smaller piece of steel so he could cut with the welding torch, he turned around to grab the torch, at that time some steel pipe slid off the rack and struck his right foot.

2008 · 1 incident

July 16, 2008 CA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor MACHINERY
Cemex Construction Materials LP · Contact with hot objects or substances

EE was heating a part to remove a broken steering ball stud in a cat 775D haul truck. Some hot grease spat back at him and struck his right forearm and caused him to srop the hot torch. The torch flame flashed by his side and burned his abdomen.

2005 · 3 incidents

December 9, 2005 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Cemex Construction Materials LP · Struck against a moving object

Employee was operating loader controls for another mechanic who was changing bucket pins. The cab was getting warm, so EE turned on the A/C. He then stuck his hand into the vent cavity (the vent louver was off & sitting on the dash in front of EE) to feel the air temperature. His left index & middle fingers came in contact with the A/C fan blower wheel.

November 1, 2005 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Cemex Construction Materials LP · Over-exertion (Not Elsewhere Classified)

EMPLOYEE WALKING ON DECK REBAR APPROXIMATELY 12" HIGH LOST HIS FOOTING CAUSING HIM TO SPRAIN/STRAIN HIS RIGHT ANKLE. EMPLOYEE DID NOT INFORM EMPLOYER UNTIL 11/4/05.

May 4, 2005 CA · Metal/Non-Metal welder (shop) MACHINERY
Cemex Construction Materials LP · Struck by flying object

WHILE EE WAS USING A CHOP SAW TO CUT A PIECE OF METAL, THE CHOP SAW DISC BROKE. A PIECE OF THE DISC FLEW AND HIT HIS FINGER, MAKING A SMALL CUT ON HIS RIGHT INDEX FINGER.

2004 · 2 incidents

May 14, 2004 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Cemex Construction Materials LP · Fall from machine

While stepping from machine to a ladder, pant leg got caught on the battery box. This caused him to fall, landing on his left side.

February 25, 2004 CA · Metal/Non-Metal mine manager, mine foreman, mine owner HANDLING OF MATERIALS
Cemex Construction Materials LP · Struck by falling object

WHILE SHOP MECHANIC WAS WORKING ON MOTOR GRADER ALTERNATOR, HIS ELBOW BUMPED THE HOOD SAFETY LATCH BRINGING THE HOOD DOWN ON TOP OF HIS HEAD. THIS RESULTED IN ABOUT A ONE INCH SUPERFICIAL LACE RATION ON TOP OF HIS HEAD.

2003 · 1 incident

December 9, 2003 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDTOOLS (NONPOWERED)
Cemex Construction Materials LP · Struck by... (Not Elsewhere Classified)

WHILE CHANGING A SCREEN ON OUR PORTABLE PLANT, EE WAS SWINGING A HAMMER TO BREAK FREE THE OLD SCREEN. HE MISSED THE TARGET AREA AND HIT HIS LEFT THUMB. THE CONTRIBUTING CAUSE OF THIS INJURY WA S HIS HAND IN THE PATH OF THE IMPACT AREA.

2001 · 2 incidents

December 5, 2001 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Cemex USA Construction Materials Inc · Caught in, under or between a moving and a stationary object

AS EE REMOVED CHOCK ON WHEELS OF CONVEYOR TO HOOK CHAIN TO LOADER BUCKET O MOVE STACKER, CONVEYOR ROLLED INTO LOADER BUCKET EDGE, PINCHING HIS CALF (LEFT LEG).

September 24, 2001 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Cemex USA Construction Materials Inc · Struck by... (Not Elsewhere Classified)

EE WAS TAKING SCREENS OFF OF FORKLIFT WHEN A SCREEN SLIPPED FROM HIS HAND & STRUCK HIS LEG RESULTING IN A LACERATION TO HIS LOWER LEFT LEG REQUIRING 6 STAPLES TO CLOSE. BACK TO WORK SAME DAY.

2000 · 1 incident

November 22, 2000 CA · Metal/Non-Metal mine manager, mine foreman, mine owner MACHINERY
Cemex USA Construction Materials Inc · Struck by falling object

LIFTING A STEEL PLATE WITH A SLING ATTACHED TO ELECTRIC HOIST. SLING SLIPPED OUT OF HOIST HOOK AND THE STEEL PLATE FELL OUT OF SLING HITTING LEFT FOOT EMPLOYEE.