Data / Mines / California / Plumas County
Mines in Plumas County, California: 10 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 10 open mines in Plumas County, California, run by 4 operators and employing 36 people. Since January 1, 2022 its inspectors issued 82 citations and orders there with $23,289 in proposed penalties, and operators reported 1 injury or illness case. The operators with the most open mines are Joy Engineering; Sierra Cascade Aggregate & Asphalt Products, Inc.; Spanish Creek Sand & Gravel LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 10
- Operators
- 4
- Employees
- 36
- Intermittent
- 7
- Active
- 3
- Citations and orders since January 1, 2022
- 82
- Significant and substantial
- 12 (14.6%)
- Closure orders
- 2
- High negligence or reckless
- 3
- Proposed penalties
- $23,289
- Amount paid so far
- $19,024
- Inspections
- 74
- Inspector hours on site
- 302
- Citations per inspection
- 1.11 (all mines 2.30)
- Accident reports
- 1
- Injury and illness cases
- 1
- Fatalities
- 0
- Latest MSHA record
- August 6, 2026
Operators with the most open mines in Plumas 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 |
|---|---|---|---|---|---|
| Joy Engineering | 6 | 23 | 16 | $2,387 | 1 |
| Sierra Cascade Aggregate & Asphalt Products, Inc. | 2 | 5 | 65 | $20,759 | 0 |
| Spanish Creek Sand & Gravel LLC | 1 | 3 | 1 | $143 | 0 |
| Folchi Logging & Construction Inc | 1 | 5 | 0 | $0 | 0 |
Operators with the most citations in Plumas 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 |
|---|---|---|---|---|---|
| Sierra Cascade Aggregate & Asphalt Products, Inc. | 2 | 5 | 65 | $20,759 | 0 |
| Joy Engineering | 6 | 23 | 16 | $2,387 | 1 |
| Spanish Creek Sand & Gravel LLC | 1 | 3 | 1 | $143 | 0 |
| Folchi Logging & Construction Inc | 1 | 5 | 0 | $0 | 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 |
|---|---|---|---|---|---|
| iRock Crusher | Sierra Cascade Aggregate & Asphalt Products, Inc. | Plumas County, CA | Crushed, broken stone | 4 | 55 |
| Blasted Rock Quarry | Joy Engineering | Plumas County, CA | Crushed, broken stone | 5 | 13 |
| Feather River Rock South Chester Pit | Sierra Cascade Aggregate & Asphalt Products, Inc. | Plumas County, CA | Construction sand and gravel | 1 | 10 |
| Powerscreen Jaw Pidpt400home28251 | Joy Engineering | Plumas County, CA | Construction sand and gravel | 5 | 1 |
| Sparrock Pit | Joy Engineering | Plumas County, CA | Dimension stone | 4 | 1 |
| Soper Pit | Spanish Creek Sand & Gravel LLC | Plumas County, CA | Construction sand and gravel | 3 | 1 |
| Powerscreen 1800 Warrior Pid00123pdgf299 | Joy Engineering | Plumas County, CA | Construction sand and gravel | 1 | 1 |
| Roberti Ranch | Folchi Logging & Construction Inc | Plumas County, CA | Sand, industrial | 5 | 0 |
| Powerscreen 1300 Max Pid13mxtcomc55064 | Joy Engineering | Plumas County, CA | Construction sand and gravel | 5 | 0 |
| Sloat Quarry | Joy Engineering | Plumas County, CA | Construction sand and gravel | 3 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 6 | 60% |
| Crushed, broken stone | 2 | 20% |
| Dimension stone | 1 | 10% |
| Sand, industrial | 1 | 10% |
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 | $409 | 0 |
| 2023 | 20 | 4 | $3,142 | 0 |
| 2024 | 33 | 2 | $13,068 | 0 |
| 2025 | 13 | 2 | $4,062 | 1 |
| 2026 | 13 | 4 | $2,608 | 0 |
Standards cited most at mines in Plumas 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 56.14107 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 3 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14103 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14110 | Surface metal and nonmetal mines | 2 |
Injury and illness cases at mines in Plumas County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 1 |
What the accident reports at mines in Plumas County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 1 |
Equipment named in accident reports at mines in Plumas County, California
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
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.