Data / Mines / Hi-Grade Materials
Hi-Grade Materials: 4 open mines, 152 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Hi-Grade Materials (MSHA operator ID L08509) operates 4 open mines with 47 employees in California, mostly construction sand and gravel. Since January 1, 2022 MSHA inspectors issued it 152 citations and orders with $59,288 in proposed penalties, and it reported 6 injury or illness cases, 1 of them fatal. Data from MSHA, November 6, 2026.
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- MSHA operator ID
- L08509
- Open mines
- 4
- Employees at open mines
- 47
- States
- California
- Parent company
- Robar Enterprises Inc
- Citations and orders since January 1, 2022
- 152
- Significant and substantial
- 48 (31.6%)
- Closure orders
- 5
- High negligence or reckless
- 23
- Proposed penalties
- $59,288
- Amount paid so far
- $59,288
- Inspections
- 82
- Inspector hours on site
- 468
- Citations per inspection
- 1.85 (all mines 2.30)
- Accident reports
- 6
- Injury and illness cases
- 6
- Fatalities
- 1
- Latest MSHA record
- September 24, 2026
Open mines of Hi-Grade Materials
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Littlerock Quarry | Hi-Grade Materials | Los Angeles County, CA | Construction sand and gravel | 13 | 59 |
| Robert E Hove Pit | Hi-Grade Materials | San Bernardino County, CA | Construction sand and gravel | 10 | 41 |
| HJ Hove | Hi-Grade Materials | Riverside County, CA | Construction sand and gravel | 19 | 34 |
| Lucerne Valley Pit | Hi-Grade Materials | San Bernardino County, CA | Construction sand and gravel | 5 | 17 |
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 | 29 | 10 | $7,413 | 0 |
| 2023 | 33 | 15 | $15,946 | 1 |
| 2024 | 42 | 11 | $15,323 | 1 |
| 2025 | 20 | 4 | $9,309 | 2 |
| 2026 | 28 | 8 | $11,297 | 2 |
Standards cited most at Hi-Grade Materials
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 56.12004 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 10 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 8 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14205 | Surface metal and nonmetal mines | 6 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 5 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4203 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 3 |
Injury and illness cases at Hi-Grade Materials
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 4 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Hi-Grade Materials describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 2 |
| Slip or fall of person | 1 |
| Fire | 1 |
| Handtools (nonpowered) | 1 |
| Disorders (physical agents) | 1 |
Equipment named in accident reports at Hi-Grade Materials
| Equipment | Reports |
|---|---|
| Front-end loader | 2 |
| Hand tools (not powered) | 1 |
Commodities
| Main commodity | Open mines |
|---|---|
| Construction sand and gravel | 4 |
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.