Grimes Rock a CalPortland Company has $70K in proposed MSHA penalties and $999 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
$69,580
proposed penalties
$55,492
paid to date
80% of proposed penalties paid to date, a $14,088 gap.
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 $70K in proposed MSHA penalties and $999 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.
$70K
proposed penalties
$56K
current assessed
$55K
paid to date
$999
outstanding
214 assessments are final orders; 14 contested dockets.
Of $41K in penalties contested before the Commission, $18K was upheld in final decisions.
As of the most recent assessment on 2026-05-27.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘShares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘContesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
55citations taken to the federal commission · 25% of citations on record
Settled
43 · 78%
Stood as issued
5 · 9%
Vacated or withdrawn
7 · 13%
39%
S&S designation survived the contest
ⓘCounts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 18 decided S&S contests · industry: 79%
56%
Penalty reduction in decided contests
$41K proposed, $18K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2024-11-10.
Contested penalties
ⓘA reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Health sampling
ⓘA sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.
Metal and nonmetal contaminants (personal samples)
ⓘMany samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2024-11-05
0%
of limit-tested samples over the exposure limit
19
samples
4
limit-tested
Most sampled contaminants
Respirable dust, <.1mg12
Quartz, respirable, >1% Qtz4
Unlisted Particulate, respirable, <1% Qtz3
Show the individual readings (19)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2024-11-05
Quartz, respirable, >1% Qtz
0.22
0.7
0.31
Hydrating Plant Operator
2019-09-11
Unlisted Particulate, respirable, <1% Qtz
0.13
Cleanup Man
2019-09-11
Respirable dust, <.1mg
0
Cleanup Man
2019-09-11
Respirable dust, <.1mg
0
Cleanup Man
2013-05-21
Unlisted Particulate, respirable, <1% Qtz
0.13
Dry Screen Plant Operator
2013-05-21
Respirable dust, <.1mg
0
Flotation/Concentrator Oper.
2013-05-21
Respirable dust, <.1mg
0
Cleanup Man
2009-04-02
Respirable dust, <.1mg
0
Laborer, Bullgang
2009-04-02
Respirable dust, <.1mg
0
Laborer, Bullgang
2005-12-07
Quartz, respirable, >1% Qtz
0.14
0.6
0.23
Front-end Loader Operator
2005-12-07
Quartz, respirable, >1% Qtz
0.33
0.9
0.37
Bulldozer Operator
2005-12-07
Unlisted Particulate, respirable, <1% Qtz
0.15
Dry Screen Plant Operator
2005-09-21
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-09-21
Respirable dust, <.1mg
0
Crusher Oper/Worker
2005-09-21
Quartz, respirable, >1% Qtz
0.38
0.51
0.75
Bulldozer Operator
2002-05-02
Respirable dust, <.1mg
0
Crusher Oper/Worker
2002-05-02
Respirable dust, <.1mg
0
Front-end Loader Operator
2002-05-02
Respirable dust, <.1mg
0
Screen/Scalper Operator
2002-05-02
Respirable dust, <.1mg
0
Cleanup Man
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Grimes Rock a CalPortland Company recorded 2.95 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘThis rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
2.95
total case rate
0.00
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In California, metal and nonmetal mining averaged 1.42 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year
total case rate
days-away
fatal
2025 *
2.95
0.00
0.000
2024 *
0.00
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
0.00
0.00
0.000
2018 *
3.02
3.02
0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
22
2025
19
2024
35
2023
33
2022
32
2021
29
2020
31
2019
28
2018
23
2017
23
2016
19
2015
19
2014
17
2013
14
2012
13
2011
16
2010
17
2009
16
2008
19
2007
20
2006
19
2005
18
2004
11
2003
10
2002
11
2001
9
2000
9
Source: MSHA quarterly employment and production, updated weekly.
Grimes Rock a CalPortland Company sits in Ventura County, California, where the Census mining category is 0.2% of county employment.
Local economic context
ⓘCounty figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Ventura County, California · Population 838,259
0.2%
Mining share of county employment
$107,327
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
2026 Q2
16,959
3
0
176.9
2026 Q1
18,567
0
0
0.0
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
Show 96 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
22,411
0
0
0.0
2024 Q1
24,273
10
1
412.0
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
6
2
609.8
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
5
3
614.4
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, 2026CA · Metal/Non-Metalwelder (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, 2026CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING 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, 2025CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techOTHER
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, 2018CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
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, 2010CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
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, 2008CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerOTHER
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, 2008CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
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, 2008CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techOTHER
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, 2007CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerOTHER
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, 2007CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techOTHER
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, 2006CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSLIP OR FALL OF PERSON
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, 2006CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanSLIP OR FALL OF PERSON
EE was working on conveyor. He slipped & struck his ribs on the conveyor cross brace.
2005 · 1 incident
April 18, 2005CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorMACHINERY
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, 2003CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS