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

Grimes Rock a CalPortland Company has $69K in proposed MSHA penalties and $0 outstanding across 14 contested dockets, plus health sampling and the full incident record.

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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
81% of proposed penalties paid to date, a $13,089 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
88
inspections on record
1,491
inspection hours
14.7
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.
219 citations across 1,491 inspection hours.
Source: MSHA inspections data, updated weekly.

Grimes Rock a CalPortland Company has $69K in proposed MSHA penalties and $0 outstanding across 14 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.
$69K
proposed penalties
$55K
current assessed
$55K
paid to date
$0
outstanding
214 assessments are final orders; 14 contested dockets.
As of the most recent assessment on 2025-11-20.
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 18,370 7 3 381.1
2025 Q3 16,333 0 0 0.0
2025 Q2 17,553 2 1 113.9
2025 Q1 15,523 6 2 386.5
2024 Q4 22,411 0 0 0.0
2024 Q3 25,681 1 0 38.9
2024 Q2 22,411 0 0 0.0
2024 Q1 24,273 10 1 412.0
Show 94 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 20,418 4 0 195.9
2023 Q3 24,715 0 0 0.0
2023 Q2 21,322 0 0 0.0
2023 Q1 22,902 1 0 43.7
2022 Q4 22,068 0 0 0.0
2022 Q3 23,843 3 0 125.8
2022 Q2 24,408 1 0 41.0
2022 Q1 23,278 5 4 214.8
2021 Q4 19,376 0 0 0.0
2021 Q3 20,843 8 1 383.8
2021 Q2 14,201 0 0 0.0
2021 Q1 13,988 2 2 143.0
2020 Q4 21,617 0 0 0.0
2020 Q3 20,190 3 1 148.6
2020 Q2 21,003 0 0 0.0
2020 Q1 21,786 2 0 91.8
2019 Q4 22,602 0 0 0.0
2019 Q3 22,363 9 1 402.5
2019 Q2 19,777 0 0 0.0
2019 Q1 15,733 4 0 254.2
2018 Q4 16,830 0 0 0.0
2018 Q3 16,821 0 0 0.0
2018 Q2 16,421 0 0 0.0
2018 Q1 16,183 2 0 123.6
2017 Q4 16,456 0 0 0.0
2017 Q3 16,219 0 0 0.0
2017 Q2 18,368 2 0 108.9
2017 Q1 14,218 0 0 0.0
2016 Q4 13,291 6 1 451.4
2016 Q3 13,534 0 0 0.0
2016 Q2 13,009 0 0 0.0
2016 Q1 13,216 0 0 0.0
2015 Q4 11,802 0 0 0.0
2015 Q3 12,014 0 0 0.0
2015 Q2 13,190 1 0 75.8
2015 Q1 12,832 0 0 0.0
2014 Q4 12,588 1 0 79.4
2014 Q3 11,796 0 0 0.0
2014 Q2 10,863 3 0 276.2
2014 Q1 9,840 7 3 711.4
2013 Q4 10,529 0 0 0.0
2013 Q3 9,648 0 0 0.0
2013 Q2 8,081 4 1 495.0
2013 Q1 8,964 0 0 0.0
2012 Q4 8,138 6 4 737.3
2012 Q3 8,384 0 0 0.0
2012 Q2 7,208 3 1 416.2
2012 Q1 7,436 0 0 0.0
2011 Q4 7,408 3 2 405.0
2011 Q3 8,550 0 0 0.0
2011 Q2 10,214 4 2 391.6
2011 Q1 9,360 0 0 0.0
2010 Q4 11,123 3 2 269.7
2010 Q3 9,957 4 2 401.7
2010 Q2 11,646 0 0 0.0
2010 Q1 9,193 0 0 0.0
2009 Q4 11,637 3 1 257.8
2009 Q3 8,400 0 0 0.0
2009 Q2 10,208 4 1 391.8
2009 Q1 8,773 0 0 0.0
2008 Q4 11,182 4 0 357.7
2008 Q3 11,073 0 0 0.0
2008 Q2 13,752 5 1 363.6
2008 Q1 10,817 2 0 184.9
2007 Q4 12,817 0 0 0.0
2007 Q3 11,010 6 2 545.0
2007 Q2 14,158 0 0 0.0
2007 Q1 11,917 5 0 419.6
2006 Q4 13,482 0 0 0.0
2006 Q3 16,166 0 0 0.0
2006 Q2 5,995 1 0 166.8
2006 Q1 12,055 0 0 0.0
2005 Q4 14,148 2 1 141.4
2005 Q3 14,786 7 0 473.4
2005 Q2 10,206 1 0 98.0
2005 Q1 10,008 0 0 0.0
2004 Q4 12,846 10 4 778.5
2004 Q3 9,399 0 0 0.0
2004 Q2 7,361 3 0 407.6
2004 Q1 2,400 0 0 0.0
2003 Q4 2,448 0 0 0.0
2003 Q3 2,004 0 0 0.0
2003 Q2 7,106 0 0 0.0
2003 Q1 7,305 1 1 136.9
2002 Q4 8,119 0 0 0.0
2002 Q3 8,944 0 0 0.0
2002 Q2 7,443 0 0 0.0
2002 Q1 8,174 1 0 122.3
2001 Q4 6,971 14 4 2008.3
2001 Q3 7,088 2 0 282.2
2001 Q2 6,050 0 0 0.0
2001 Q1 6,068 0 0 0.0
2000 Q3 7,887 0 0 0.0
2000 Q2 4,977 28 14 5625.9
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.

For insurers, brokers, and safety consultants

The full compliance file on Grimes Rock a CalPortland Company

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.