Data / Mines / California / Mendocino County
Mines in Mendocino County, California: 9 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 9 open mines in Mendocino County, California, run by 7 operators and employing 27 people. Since January 1, 2022 its inspectors issued 96 citations and orders there with $17,529 in proposed penalties, and operators reported no injury or illness cases. The operators with the most open mines are Geo Aggregates; Grist Creek Aggregates LLC; Northern Aggregates Inc. Data from MSHA, November 6, 2026.
The request: Get every open mine in Mendocino County, California from MSHA with its operator, employees, and the operator's website, headquarters and size. $10 of work on sign-up, no card.
SpecStream is the live web data engine for teams and agents. It reads the mine, citation, inspection and accident files that MSHA publishes, and this page is that reading. Ask for the mines of a commodity, state or operator with the operator's headquarters, website and size added from the web, and new mines, new citations and new accident reports arrive in your sheet, CRM, Slack or agent as MSHA posts them.
- Open mines
- 9
- Operators
- 7
- Employees
- 27
- Intermittent
- 6
- Active
- 3
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 96
- Significant and substantial
- 15 (15.6%)
- Closure orders
- 4
- High negligence or reckless
- 2
- Proposed penalties
- $17,529
- Amount paid so far
- $17,529
- Inspections
- 72
- Inspector hours on site
- 392
- Citations per inspection
- 1.33 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- July 23, 2026
Operators with the most open mines in Mendocino County, California
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Geo Aggregates | 3 | 5 | 15 | $2,493 | 0 |
| Grist Creek Aggregates LLC | 1 | 3 | 24 | $3,809 | 0 |
| Northern Aggregates Inc | 1 | 9 | 21 | $4,593 | 0 |
| Kibesillah Rock Company | 1 | 2 | 20 | $4,178 | 0 |
| Nor-Cal Recycled Rock & Aggregates, Inc. | 1 | 3 | 10 | $1,585 | 0 |
| Greenwood Aggregates Inc | 1 | 2 | 4 | $587 | 0 |
Operators with the most citations in Mendocino County, California
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Grist Creek Aggregates LLC | 1 | 3 | 24 | $3,809 | 0 |
| Northern Aggregates Inc | 1 | 9 | 21 | $4,593 | 0 |
| Kibesillah Rock Company | 1 | 2 | 20 | $4,178 | 0 |
| Geo Aggregates | 3 | 5 | 15 | $2,493 | 0 |
| Nor-Cal Recycled Rock & Aggregates, Inc. | 1 | 3 | 10 | $1,585 | 0 |
| Greenwood Aggregates Inc | 1 | 2 | 4 | $587 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Grist Creek Aggregates, Longvale Plant | Grist Creek Aggregates LLC | Mendocino County, CA | Construction sand and gravel | 3 | 24 |
| Harris Quarry | Northern Aggregates Inc | Mendocino County, CA | Crushed, broken stone | 9 | 21 |
| Wilsey Ranch Quarry | Kibesillah Rock Company | Mendocino County, CA | Construction sand and gravel | 2 | 20 |
| Geo Plant | Geo Aggregates | Mendocino County, CA | Construction sand and gravel | 3 | 13 |
| Ford Gravel | Nor-Cal Recycled Rock & Aggregates, Inc. | Mendocino County, CA | Construction sand and gravel | 3 | 10 |
| Greenwood Aggregates | Greenwood Aggregates Inc | Mendocino County, CA | Sand, industrial | 2 | 4 |
| Ten Mile River Plant | Geo Aggregates | Mendocino County, CA | Construction sand and gravel | 1 | 1 |
| Sherwood Rd Quarry | Geo Aggregates | Mendocino County, CA | Construction sand and gravel | 1 | 1 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 7 | 77.8% |
| Crushed, broken stone | 1 | 11.1% |
| Sand, industrial | 1 | 11.1% |
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 | 33 | 9 | $5,329 | 0 |
| 2023 | 15 | 0 | $2,161 | 0 |
| 2024 | 19 | 3 | $4,061 | 0 |
| 2025 | 23 | 3 | $4,946 | 0 |
| 2026 | 6 | 0 | $1,032 | 0 |
Standards cited most at mines in Mendocino County, California
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 | 10 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 8 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 6 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.15001 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 47.41 | Hazard communication | 3 |
| 30 CFR 56.14206 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 2 |
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.