Data / Mines / California / Littlerock Quarry
Littlerock Quarry: 59 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Littlerock Quarry is an active construction sand and gravel surface mine in Los Angeles County, California, operated by Hi-Grade Materials with 13 employees on MSHA's record (mine ID 0404802). Since January 1, 2022 MSHA inspectors issued 59 citations and orders there with $30,205 in proposed penalties, and 2 accident reports were filed there, with 2 injury or illness cases, 1 of them fatal.
The request: Watch Littlerock Quarry (MSHA mine ID 0404802) in Los Angeles County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0404802
- Status
- Active since April 22, 1986
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Los Angeles County, California
- Nearest town
- Littlerock
- Operator
- Hi-Grade Materials
- Parent company
- Robar Enterprises Inc
- Employees
- 13
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 59
- Significant and substantial
- 23 (39.0%)
- Closure orders
- 2
- High negligence or reckless
- 8
- Proposed penalties
- $30,205
- Amount paid so far
- $30,205
- Inspections
- 32
- Inspector hours on site
- 200
- Citations per inspection
- 1.84 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 2
- Fatalities
- 1
- Latest MSHA record
- July 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 | 13 | 6 | $2,436 | 0 |
| 2023 | 15 | 9 | $12,399 | 1 |
| 2024 | 19 | 7 | $11,818 | 1 |
| 2025 | 10 | 0 | $1,970 | 0 |
| 2026 | 2 | 1 | $1,582 | 0 |
Standards cited most at Littlerock Quarry
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 | 6 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14205 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.16006 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 2 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.15005 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 2 |
Injury and illness cases at Littlerock Quarry
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 1 |
What the accident reports at Littlerock Quarry describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 1 |
| Fire | 1 |
Equipment named in accident reports at Littlerock Quarry
| Equipment | Reports |
|---|---|
| Front-end loader | 2 |
Other open mines in Los Angeles County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Irwindale Plant | United Rock Products Corp | Los Angeles County, CA | Construction sand and gravel | 35 | 80 |
| Coast Aggregates Big Rock Creek | Coast Aggregates | Los Angeles County, CA | Sand, common | 22 | 71 |
| Big Rock Creek Quarry | Granite Construction Company | Los Angeles County, CA | Sand, industrial | 5 | 14 |
| Holliday Rock-Little Rock Plant | Holliday Rock Company Inc | Los Angeles County, CA | Construction sand and gravel | 16 | 13 |
| Irwindale Aggregates | Hanson Aggregates LLC | Los Angeles County, CA | Construction sand and gravel | 43 | 12 |
| Palmdale | Robertson's Ready Mix Ltd | Los Angeles County, CA | Construction sand and gravel | 10 | 11 |
| Pebbly Beach Quarry | Connolly-Pacific Company | Los Angeles County, CA | Crushed, broken stone | 19 | 10 |
| Acton Clay Quarries | North Star Minerals Inc | Los Angeles County, CA | Clay, ceramic, refractory mnls. | 3 | 9 |
| Palmdale Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 15 | 5 |
| Durbin Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 38 | 4 |
| Peck Road Gravel Pit | S L S & N Inc | Los Angeles County, CA | Construction sand and gravel | 7 | 4 |
| Reliance Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 35 | 3 |
| Sylmar Site | C & M Topsoil, Inc. | Los Angeles County, CA | Sand, common | 4 | 3 |
| 75TH Street Quarry and Recycling | 75TH Street Quarry and Recycling | Los Angeles County, CA | Sand, common | 2 | 3 |
| Azusa Rock | Azusa Rock, LLC | Los Angeles County, CA | Crushed, broken stone | 12 | 1 |
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.