Data / Mines / California / Diamond T Natural Resources, LLC
Diamond T Natural Resources, LLC: 10 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Diamond T Natural Resources, LLC is an active crushed, broken stone surface mine in Sonoma County, California, operated by Canyon Rock Co Inc with 6 employees on MSHA's record (mine ID 0404981). Since January 1, 2022 MSHA inspectors issued 10 citations and orders there with $1,432 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Diamond T Natural Resources, LLC (MSHA mine ID 0404981) 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
- 0404981
- Status
- Active since November 1, 1988
- Main commodity
- Crushed, broken stone
- Mine type
- Surface
- County
- Sonoma County, California
- Nearest town
- Cazadero
- Operator
- Canyon Rock Co Inc
- Employees
- 6
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 10
- Significant and substantial
- 0 (0.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $1,432
- Amount paid so far
- $1,432
- Inspections
- 15
- Inspector hours on site
- 80
- Citations per inspection
- 0.67 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- September 22, 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 | 3 | 0 | $399 | 0 |
| 2023 | 3 | 0 | $429 | 0 |
| 2025 | 4 | 0 | $604 | 0 |
Standards cited most at Diamond T Natural Resources, LLC
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 | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 2 |
| 30 CFR 56.4603 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12025 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 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 |
| Mark West Quarry | Dutra Materials | Sonoma County, CA | Crushed, broken stone | 8 | 31 |
| 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 |
| 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.