Data / Mines / California / San Bernardino County
Mines in San Bernardino County, California: 42 open mines
MSHA lists 42 open mines in San Bernardino County, California, run by 30 operators and employing 1,891 people. Since January 1, 2022 its inspectors issued 1,528 citations and orders there with $1,191,158 in proposed penalties, and operators reported 228 injury or illness cases. The operators with the most open mines are Cemex Construction Materials Pacific, LLC; CalPortland Company; Robertson's Ready Mix Ltd. Data from MSHA, November 6, 2026.
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- Open mines
- 42
- Operators
- 30
- Employees
- 1,891
- Active
- 32
- Intermittent
- 10
- Mines run by individuals, counted and not listed
- 2
- Citations and orders since January 1, 2022
- 1,528
- Significant and substantial
- 363 (23.8%)
- Closure orders
- 49
- High negligence or reckless
- 156
- Proposed penalties
- $1,191,158
- Amount paid so far
- $1,035,866
- Inspections
- 540
- Inspector hours on site
- 6,822
- Citations per inspection
- 2.83 (all mines 2.30)
- Accident reports
- 246
- Injury and illness cases
- 228
- Fatalities
- 0
- Latest MSHA record
- October 15, 2026
Operators with the most open mines in San Bernardino County, California
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
Operators with the most citations in San Bernardino County, California
Citations and orders issued since January 1, 2022 at their open mines here.
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 |
|---|---|---|---|---|---|
| Black Mountain Quarry | Cemex Construction Materials Pacific, LLC | San Bernardino County, CA | Cement | 133 | 244 |
| Mt Pass Mine & Mill | MP Mine Operations, LLC. | San Bernardino County, CA | Rare earths ore | 790 | 196 |
| Cushenbury Plant | Mitsubishi Cement Corp | San Bernardino County, CA | Cement | 160 | 179 |
| Victorville Cement Plant | Cemex Construction Materials Pacific, LLC | San Bernardino County, CA | Cement | 126 | 148 |
| Oro Grande Quarry | CalPortland Company | San Bernardino County, CA | Cement | 137 | 146 |
| Lucerne Valley Plant and Quarry | Specialty Minerals Inc | San Bernardino County, CA | Crushed, broken limestone | 86 | 107 |
| Omya California | Omya Inc | San Bernardino County, CA | Crushed, broken limestone | 62 | 46 |
| Robert E Hove Pit | Hi-Grade Materials | San Bernardino County, CA | Construction sand and gravel | 10 | 41 |
| Upland Pit and Mill | Holliday Rock Company Inc | San Bernardino County, CA | Construction sand and gravel | 55 | 30 |
| Protech Minerals, LLC | Protech Minerals, LLC | San Bernardino County, CA | Clay, ceramic, refractory mnls. | 6 | 30 |
| Oro Grande Pit | Agcon Inc. | San Bernardino County, CA | Construction sand and gravel | 4 | 30 |
| Lynx Cat Quarry | Lynx Cat Mountain Quarry Operations, LLC | San Bernardino County, CA | Sand, industrial | 16 | 27 |
| Silver Lake Mine | James Gang Enterprises Inc. | San Bernardino County, CA | Iron ore | 6 | 23 |
| Lytle Creek Pit | Cemex Construction Materials Pacific, LLC | San Bernardino County, CA | Construction sand and gravel | 44 | 22 |
| Campus Plant | Holliday Rock Company Inc | San Bernardino County, CA | Construction sand and gravel | 15 | 22 |
| Valley Salt | West Coast Aggregate Supply | San Bernardino County, CA | Salt | 5 | 21 |
| Red Top Mine | Sierra Aggregate Company, Inc. | San Bernardino County, CA | Crushed, broken stone | 3 | 20 |
| Redlands | Robertson's Ready Mix Ltd | San Bernardino County, CA | Construction sand and gravel | 12 | 18 |
| Lucerne Valley Pit | Hi-Grade Materials | San Bernardino County, CA | Construction sand and gravel | 5 | 17 |
| Newberry Mill | Elementis Specialties Inc | San Bernardino County, CA | Common clays | 23 | 16 |
| Cucamonga Creek Mine | MRC Rock & Sand, LLC. | San Bernardino County, CA | Sand, industrial | 4 | 15 |
| Scheerer Quarry | CalPortland Company | San Bernardino County, CA | Sand, common | 11 | 14 |
| Dunn Mill | Pacific Mining and Minerals, LLC | San Bernardino County, CA | Potash | 3 | 13 |
| West Coast Brubaker-Mann | West Coast Aggregate Supply | San Bernardino County, CA | Crushed, broken stone | 15 | 12 |
| Ibex Bentonite | Protech Minerals, LLC | San Bernardino County, CA | Bentonite | 1 | 10 |
| Cabazon Rock Plant | Matich Corporation | San Bernardino County, CA | Construction sand and gravel | 7 | 8 |
| Gilstrap Trucking,Inc. | Gilstrap Trucking, Inc. | San Bernardino County, CA | Construction sand and gravel | 1 | 8 |
| Mesquite Lake Gypsum Mine | Jedco Inc. | San Bernardino County, CA | Gypsum | 1 | 8 |
| San Bernardino Plant | CalMat Co | San Bernardino County, CA | Construction sand and gravel | 24 | 6 |
| Alpha Materials, Inc. | Alpha Materials, Inc. | San Bernardino County, CA | Sand, common | 2 | 6 |
| Rialto | Robertson's Ready Mix Ltd | San Bernardino County, CA | Construction sand and gravel | 28 | 4 |
| Hector Mine | Elementis Specialties Inc | San Bernardino County, CA | Common clays | 12 | 4 |
| Panamint Mine | Bowman Asphalt Inc. | San Bernardino County, CA | Construction sand and gravel | 2 | 4 |
| Iron Age Mine | Iron Age Mine LLC | San Bernardino County, CA | Iron ore | 2 | 4 |
| Lucerne Valley | Robertson's Ready Mix Ltd | San Bernardino County, CA | Construction sand and gravel | 8 | 3 |
| Redlands Quarry | Cemex Construction Materials LP | San Bernardino County, CA | Construction sand and gravel | 10 | 2 |
| Black Angel Vulcan | BJ Rees's Enterprise | San Bernardino County, CA | Construction sand and gravel | 5 | 2 |
| Colosseum Rare Metals Inc. | Colosseum Rare Metals Inc. | San Bernardino County, CA | Gold ore | 6 | 1 |
| Baxter Mine | CalPortland Company | San Bernardino County, CA | Iron ore | 3 | 1 |
| Amboy Limestone Quarry | Omya Inc | San Bernardino County, CA | Crushed, broken limestone | 7 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 16 | 38.1% |
| Cement | 4 | 9.5% |
| Crushed, broken limestone | 3 | 7.1% |
| Iron ore | 3 | 7.1% |
| Crushed, broken stone | 2 | 4.8% |
| Common clays | 2 | 4.8% |
| Gold ore | 2 | 4.8% |
| Sand, common | 2 | 4.8% |
| Sand, industrial | 2 | 4.8% |
| Potash | 1 | 2.4% |
| Clay, ceramic, refractory mnls. | 1 | 2.4% |
| Rare earths ore | 1 | 2.4% |
| Bentonite | 1 | 2.4% |
| Gypsum | 1 | 2.4% |
| Salt | 1 | 2.4% |
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 | 242 | 62 | $381,822 | 41 |
| 2023 | 351 | 85 | $185,628 | 56 |
| 2024 | 291 | 61 | $163,298 | 43 |
| 2025 | 351 | 75 | $222,844 | 48 |
| 2026 | 293 | 80 | $237,566 | 40 |
Standards cited most at mines in San Bernardino 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 56.20003 | Surface metal and nonmetal mines | 163 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 133 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 102 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 77 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 73 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 67 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 57 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 49 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 37 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 37 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 35 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 31 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 30 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 29 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 27 |
Injury and illness cases at mines in San Bernardino County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 184 |
| No lost time, or an occupational illness | 43 |
What the accident reports at mines in San Bernardino County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 76 |
| Slip or fall of person | 59 |
| Powered haulage | 23 |
| Machinery | 23 |
| Handtools (nonpowered) | 22 |
| Other | 12 |
| Entrapment | 9 |
| Striking or bumping | 6 |
| Exploding vessels under pressure | 4 |
| Fire | 3 |
Equipment named in accident reports at mines in San Bernardino County, California
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 21 |
| Hand tools (powered) | 11 |
| Ore haulage trucks - off highway trucks | 10 |
| Front-end loader | 8 |
| Elevator | 8 |
| Trucks | 7 |
| Conveyor | 5 |
| Forklift | 5 |
| Crane | 4 |
| Machine | 3 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. 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.