Data / Mines / California / Rialto
Rialto, San Bernardino County, California: 4 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Rialto is an active construction sand and gravel surface mine in San Bernardino County, California, operated by Robertson's Ready Mix Ltd with 28 employees on MSHA's record (mine ID 0405392). Since January 1, 2022 MSHA inspectors issued 4 citations and orders there with $607 in proposed penalties, and 1 accident report was filed there, with 1 injury or illness case.
The request: Watch Rialto (MSHA mine ID 0405392) in San Bernardino County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405392
- Status
- Active since November 2, 1999
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- San Bernardino County, California
- Nearest town
- Rialto
- Operator
- Robertson's Ready Mix Ltd
- Employees
- 28
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 4
- Significant and substantial
- 1 (25.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $607
- Amount paid so far
- $607
- Inspections
- 11
- Inspector hours on site
- 90
- Citations per inspection
- 0.36 (all mines 2.30)
- Accident reports
- 1
- Injury and illness cases
- 1
- Fatalities
- 0
- Latest MSHA record
- September 17, 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 |
|---|---|---|---|---|
| 2023 | 1 | 0 | $143 | 0 |
| 2025 | 2 | 1 | $464 | 1 |
| 2026 | 1 | 0 | $0 | 0 |
Standards cited most at Rialto
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 | 1 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Rialto
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 Rialto describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Striking or bumping | 1 |
Equipment named in accident reports at Rialto
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
Other open mines in San Bernardino County, California
| 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 |
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.