Mining Incidents

Grimes Rock a CalPortland Company Metal/Non-Metal

CalPortland · Surface
Controlled by Taiheiyo Cement Corp
Fillmore, Ventura County, CA  ·  Active
MSHA Mine ID: 0405432

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Fatalities
0
Total incidents
15
Years on record
2003–2026
Latest incident
Feb 2026
Compliance record
MSHA citations since 2000
219
citations
63
significant & substantial
$68,581
proposed penalties
$55,492
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 18,370 7 3 381.1
2025 Q3 16,333 0 0 0.0
2025 Q2 1,050 2 1 1904.8
2025 Q1 15,523 6 2 386.5
2024 Q4 1,558 0 0 0.0
2024 Q3 23,809 1 0 42.0
2024 Q2 22,411 0 0 0.0
2024 Q1 24,273 10 1 412.0
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

15 on file

2026 · 2 incidents

February 25, 2026 CA · Metal/Non-Metal welder (non-shop) POWERED HAULAGE
CalPortland · Caught in, under or between running or meshing objects

Mechanic was adjusting a wiper blade when their shirt or tool caught on conveyor belt pulling their arm into head pulley causing a dislocated elbow and fracture on ulna and missing finger nail.

January 7, 2026 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
CalPortland · Fall to the walkway or working surface

Employee was removing screens from shaker for cleaning when one of the screens caught the harness they were wearing causing them to fall and hurt a knee.

2025 · 1 incident

August 25, 2025 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
CalPortland · Bodily reaction, (Not Elsewhere Classified)

Employee was bending over to pick up a piece of pipe when they felt a strain in their back. Employee did not pick up the pipe only hurt their back bending over.

2018 · 1 incident

November 29, 2018 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Grimes Rock Inc · Over-exertion in lifting objects

Employee reported the injury on 12/5/2018. Employee stated that shoveling and digging with a shovel made EE's left hand become swollen.

2010 · 1 incident

March 22, 2010 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Grimes Rock Inc · Struck by falling object

employee was carrying a piece of 6" pipe on the mud press. he slipped and let go of the pipe to grab the handrail, the pipe fell onto employee's hand cutting his left ring finger. His finger required stiches from the E.R.

2008 · 3 incidents

July 8, 2008 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER
Grimes Rock Inc · Bodily reaction, (Not Elsewhere Classified)

EE had a injury on 7/19/07 and came back on 7/26/07. He worked from 7/26/07-4/17/08. EE has not been to work since 4/17/08 from the original injury that occured.The EE notified staff on 7/8/08 about a new injury the EE stated occured within 7/19/07-4/17/08.EE stated he has pain in both hands, forearms but more pain in the right hand.

May 25, 2008 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Grimes Rock Inc · Struck by... (Not Elsewhere Classified)

The employee was working on the wet screen, when a peice of metal hit him on his head. He had some head pain. He was taken to Santa Paula Hospital ER for further evaluation. He was released a couple of hours later. He was fine and doctor gave him 3 days off from work.

January 19, 2008 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
Grimes Rock Inc · Struck by flying object

Grinding a piece of metal on a windy day.

2007 · 3 incidents

July 25, 2007 CA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor SLIP OR FALL OF PERSON
Grimes Rock Inc · Fall to the walkway or working surface

Employee was filling up the water truck, he walked around to the front of the truck and fell. He tried to catch himself but fell to the ground on his left side. He had a laceration above his left eyebrow and a contusion to his left chest area. Employee was taken to urgent care. He had a few stitches to his left eyebrow. Employee returned to work after seeing the doctor that day.

July 19, 2007 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER
Grimes Rock Inc · Unclassified, insufficient data

Employee stated that he started to feel sensation in his thumb and fingers. A few weeks later this tingling started turning into pain in his neck and shoulder. The pain was moderate but constant.

June 16, 2007 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
Grimes Rock Inc · Struck by flying object

The employee was cutting a piece of metal on a windy day and he thought that he got a piece of metal in his right eye, but it ended up being a rock in his right eye. Employee went to an urgent care facility and they flushed his eye and removed the rock. Doctors noted no damage was done and no other conditions that would delay patient's recovery.

2006 · 2 incidents

August 16, 2006 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Grimes Rock Inc · Fall down stairs

On 8-15-06 the stairway was broken by an employee that afternoon, who was told to fix it. Employee came on early next morning and was going over the stairway. Stairway gave way and then he fell. Stairway landed on conveyor belt and employee held onto the hand rail. Employee complained of lower back pain. Employee was taken to the hospital, and was released the same day.

April 26, 2006 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Grimes Rock Inc · Fall onto or against objects

EE was working on conveyor. He slipped & struck his ribs on the conveyor cross brace.

2005 · 1 incident

April 18, 2005 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
Grimes Rock Inc · Caught in, under or between running or meshing objects

EE proceeded to the tunnel to evaluate the reason the discharge feeder was not discharging material. As he was walking over to check it out, feeder started discharging material. Apparently not realizing feeder had started, he removed the guard to pull start the belt which cut his thumb & 2 fingers requiring stitches. Miners have been warned of the safety hazard of this procedure.

2003 · 1 incident

March 10, 2003 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Grimes Rock Inc · Struck by falling object

WHILE REMOVING AND REPLACING A ROLLER ON A DOZER, THE ROLLER SLIPPED, FALLING AND CAUSING THE ROLLER TO CUT HIS FINGER.