Data / Mines / California / Maitri Canyon Plant
Maitri Canyon Plant: 24 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Maitri Canyon Plant is an active construction sand and gravel surface mine in Riverside County, California, operated by Foster Sand & Gravel with 19 employees on MSHA's record (mine ID 0403684). Since January 1, 2022 MSHA inspectors issued 24 citations and orders there with $5,643 in proposed penalties, and 3 accident reports were filed there, with 3 injury or illness cases.
The request: Watch Maitri Canyon Plant (MSHA mine ID 0403684) 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
- 0403684
- Status
- Active since September 13, 1974
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Riverside County, California
- Nearest town
- Corona
- Operator
- Foster Sand & Gravel
- Employees
- 19
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 24
- Significant and substantial
- 6 (25.0%)
- Closure orders
- 0
- High negligence or reckless
- 1
- Proposed penalties
- $5,643
- Amount paid so far
- $5,643
- Inspections
- 25
- Inspector hours on site
- 152
- Citations per inspection
- 0.96 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- September 23, 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 | 8 | 0 | $1,458 | 1 |
| 2023 | 3 | 1 | $998 | 0 |
| 2024 | 5 | 2 | $1,398 | 2 |
| 2025 | 5 | 2 | $755 | 0 |
| 2026 | 3 | 1 | $1,034 | 0 |
Standards cited most at Maitri Canyon 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 56.14107 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14110 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14130 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Maitri Canyon Plant
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 1 |
| No lost time, or an occupational illness | 2 |
What the accident reports at Maitri Canyon Plant describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 2 |
| Handtools (nonpowered) | 1 |
Equipment named in accident reports at Maitri Canyon Plant
| Equipment | Reports |
|---|---|
| Crusher | 1 |
| Hand tools (not powered) | 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 |
| 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 |
| Crawford's Mine | Crawford Associates | Riverside County, CA | Construction sand and gravel | 3 | 21 |
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.