Data / Mines / California / Corona Plant
Corona Plant, Riverside County, California: 3 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Corona Plant is an active construction sand and gravel surface mine in Riverside County, California, operated by CalMat Co with 33 employees on MSHA's record (mine ID 0405095). Since January 1, 2022 MSHA inspectors issued 3 citations and orders there with $804 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Corona Plant (MSHA mine ID 0405095) in Riverside County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405095
- Status
- Active since June 14, 1990
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Riverside County, California
- Nearest town
- Corona
- Operator
- CalMat Co
- Parent company
- Vulcan Materials Company
- Employees
- 33
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 3
- Significant and substantial
- 1 (33.3%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $804
- Amount paid so far
- $804
- Inspections
- 11
- Inspector hours on site
- 134
- Citations per inspection
- 0.27 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- August 24, 2026
- Citations issued to contractors here
- 6 ($1,917 proposed)
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 | 1 | $804 | 0 |
Standards cited most at Corona Plant
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 46.9 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 1 |
Other open mines in Riverside County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| 3M Corona Plant | 3M Company | Riverside County, CA | Crushed, broken stone | 85 | 66 |
| 3M | Fst Sand & Gravel Inc | Riverside County, CA | Construction sand and gravel | 93 | 47 |
| Coachella Valley Aggregate | Coachella Valley Aggregates Inc | Riverside County, CA | Construction sand and gravel | 11 | 39 |
| Nichols Road Pit | Chandler Aggregates Inc | Riverside County, CA | Construction sand and gravel | 23 | 35 |
| North Fontana | Earth Tek Engineering Corp. | Riverside County, CA | Construction sand and gravel | 6 | 35 |
| HJ Hove | Hi-Grade Materials | Riverside County, CA | Construction sand and gravel | 19 | 34 |
| Chandler Aggregates, Gilman Springs | Chandler Aggregates Inc | Riverside County, CA | Dimension limestone | 20 | 32 |
| Pacific Aggregates Pits | Pacific Aggregates Inc | Riverside County, CA | Construction sand and gravel | 30 | 31 |
| Maitri Sand and Gravel | Hanson Aggregates LLC | Riverside County, CA | Construction sand and gravel | 15 | 30 |
| Thousand Palms Pit | Coronet Concrete Products Inc | Riverside County, CA | Construction sand and gravel | 6 | 28 |
| Plant #5 | Onyx Materials | Riverside County, CA | Construction sand and gravel | 3 | 28 |
| West Coast Aggregate Supply Inc | West Coast Aggregate Supply | Riverside County, CA | Construction sand and gravel | 11 | 26 |
| Maitri Canyon Plant | Foster Sand & Gravel | Riverside County, CA | Construction sand and gravel | 19 | 24 |
| West Coast Aggregate Supply Inc | West Coast Aggregate Supply | Riverside County, CA | Construction sand and gravel | 6 | 24 |
| All American Aggregates | All American Aggregates | Riverside County, CA | Construction sand and gravel | 55 | 22 |
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.