Data / Mines / California / iRock Crusher
iRock Crusher, Plumas County, California: 55 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
iRock Crusher is an active crushed, broken stone surface mine in Plumas County, California, operated by Sierra Cascade Aggregate & Asphalt Products, Inc. with 4 employees on MSHA's record (mine ID 0405914). Since January 1, 2022 MSHA inspectors issued 55 citations and orders there with $18,604 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch iRock Crusher (MSHA mine ID 0405914) in Plumas County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405914
- Status
- Active since May 29, 2023
- Main commodity
- Crushed, broken stone
- Mine type
- Surface
- County
- Plumas County, California
- Nearest town
- Beckwourth
- Operator
- Sierra Cascade Aggregate & Asphalt Products, Inc.
- Employees
- 4
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 55
- Significant and substantial
- 6 (10.9%)
- Closure orders
- 0
- High negligence or reckless
- 3
- Proposed penalties
- $18,604
- Amount paid so far
- $16,192
- Inspections
- 12
- Inspector hours on site
- 65
- Citations per inspection
- 4.58 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- July 30, 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 | 2 | 0 | $266 | 0 |
| 2023 | 8 | 2 | $1,359 | 0 |
| 2024 | 33 | 2 | $13,068 | 0 |
| 2025 | 9 | 2 | $3,458 | 0 |
| 2026 | 3 | 0 | $453 | 0 |
Standards cited most at iRock Crusher
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 56.14112 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 3 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 2 |
| 30 CFR 41.12 | Notice of legal identity | 1 |
| 30 CFR 56.4230 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 47.41 | Hazard communication | 1 |
Other open mines in Plumas County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| 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 |
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.