Data / Mines / California / Grimes Rock a CalPortland Company
Grimes Rock a CalPortland Company: 43 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Grimes Rock a CalPortland Company is an active construction sand and gravel surface mine in Ventura County, California, operated by CalPortland Company with 14 employees on MSHA's record (mine ID 0405432). Since January 1, 2022 MSHA inspectors issued 43 citations and orders there with $11,813 in proposed penalties, and 3 accident reports were filed there, with 3 injury or illness cases.
The request: Watch Grimes Rock a CalPortland Company (MSHA mine ID 0405432) in Ventura County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405432
- Status
- Active since April 18, 2000
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Ventura County, California
- Nearest town
- Fillmore
- Operator
- CalPortland Company
- Parent company
- Taiheiyo Cement Corp
- Employees
- 14
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 43
- Significant and substantial
- 11 (25.6%)
- Closure orders
- 1
- High negligence or reckless
- 6
- Proposed penalties
- $11,813
- Amount paid so far
- $10,348
- Inspections
- 24
- Inspector hours on site
- 136
- Citations per inspection
- 1.79 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- May 27, 2026
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 9 | 4 | $4,033 | 0 |
| 2023 | 5 | 0 | $1,422 | 0 |
| 2024 | 11 | 1 | $2,331 | 0 |
| 2025 | 15 | 6 | $3,028 | 1 |
| 2026 | 3 | 0 | $999 | 2 |
Standards cited most at Grimes Rock a CalPortland Company
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 3 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4200 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14115 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12019 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Grimes Rock a CalPortland Company
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 3 |
What the accident reports at Grimes Rock a CalPortland Company describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 1 |
| Other | 1 |
| Powered haulage | 1 |
Equipment named in accident reports at Grimes Rock a CalPortland Company
| Equipment | Reports |
|---|---|
| Conveyor | 1 |
Other open mines in Ventura County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Canyon Rock Plant | Gillibrand Industrial Sands, LLC | Ventura County, CA | Sand, industrial | 55 | 40 |
| Arcosa Frazier Park Plant# 1603 | Arcosa Lwfp, LLC | Ventura County, CA | Clay, ceramic, refractory mnls. | 22 | 37 |
| Santa Paula Materials | Santa Paula Materials | Ventura County, CA | Construction sand and gravel | 8 | 24 |
| Wayne J. Sand & Gravel Inc. | Wayne J. Sand & Gravel Inc. | Ventura County, CA | Construction sand and gravel | 14 | 23 |
| Moorpark Quarry | Cemex Construction Materials Pacific, LLC | Ventura County, CA | Construction sand and gravel | 9 | 21 |
| Pacific Rock Inc | Pacific Rock Inc | Ventura County, CA | Crushed, broken stone | 5 | 9 |
| Ojai Quarry | MRC Rock & Sand, LLC. | Ventura County, CA | Crushed, broken granite | 2 | 7 |
| Tapo Rock & Sand | Tapo Rock & Sand | Ventura County, CA | Construction sand and gravel | 5 | 4 |
| S-6 Red | Upland Rock | Ventura County, CA | Sand, common | 2 | 3 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.