Data / Mines / California / Mark West Quarry
Mark West Quarry: 31 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Mark West Quarry is an active crushed, broken stone surface mine in Sonoma County, California, operated by Dutra Materials with 8 employees on MSHA's record (mine ID 0400600). Since January 1, 2022 MSHA inspectors issued 31 citations and orders there with $5,389 in proposed penalties, and 3 accident reports were filed there, with 3 injury or illness cases.
The request: Watch Mark West Quarry (MSHA mine ID 0400600) in Sonoma County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0400600
- Status
- Active since July 18, 1989
- Main commodity
- Crushed, broken stone
- Mine type
- Surface
- County
- Sonoma County, California
- Nearest town
- Santa Rosa
- Operator
- Dutra Materials
- Parent company
- CRH PLC
- Employees
- 8
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 31
- Significant and substantial
- 1 (3.2%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $5,389
- Amount paid so far
- $4,874
- Inspections
- 14
- Inspector hours on site
- 142
- Citations per inspection
- 2.21 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- August 5, 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 | 6 | 0 | $798 | 0 |
| 2023 | 3 | 0 | $429 | 1 |
| 2024 | 19 | 1 | $2,955 | 0 |
| 2025 | 3 | 0 | $1,207 | 0 |
| 2026 | 0 | 0 | $0 | 2 |
Standards cited most at Mark West Quarry
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 56.14107 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14109 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 2 |
| 30 CFR 47.41 | Hazard communication | 2 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12019 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4102 | Surface metal and nonmetal mines | 1 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Mark West Quarry
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 2 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Mark West Quarry describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 2 |
| Handling of materials | 1 |
Equipment named in accident reports at Mark West Quarry
| Equipment | Reports |
|---|---|
| Ore haulage trucks - off highway trucks | 1 |
| Front-end loader | 1 |
Other open mines in Sonoma County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Canyon Rock Co Inc | Canyon Rock Co Inc | Sonoma County, CA | Crushed, broken stone | 15 | 41 |
| Blue Rock Quarry | Dutra Materials | Sonoma County, CA | Crushed, broken traprock | 11 | 12 |
| Soiland Co., Inc. | Soiland Co., Inc. | Sonoma County, CA | Crushed, broken stone | 20 | 10 |
| Diamond T Natural Resources, LLC | Canyon Rock Co Inc | Sonoma County, CA | Crushed, broken stone | 6 | 10 |
| Roblar Quarry LLC | Roblar Quarry LLC | Sonoma County, CA | Construction sand and gravel | 12 | 4 |
| Soils Plus | Soiland Co., Inc. | Sonoma County, CA | Crushed, broken stone | 5 | 4 |
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.