Data / Mines / California / San Diego County
Mines in San Diego County, California: 13 open mines
MSHA lists 13 open mines in San Diego County, California, run by 11 operators and employing 118 people. Since January 1, 2022 its inspectors issued 223 citations and orders there with $136,404 in proposed penalties, and operators reported 15 injury or illness cases, 1 of them fatal. The operators with the most open mines are Superior Ready Mix Concrete L P; Martin Marietta San Diego Aggregates, LLC; Robertson's Ready Mix Ltd. Data from MSHA, November 6, 2026.
SpecStream is the live web data engine for teams and agents. It reads the mine, citation, inspection and accident files that MSHA publishes, and this page is that reading. Ask for the mines of a commodity, state or operator with the operator's headquarters, website and size added from the web, and new mines, new citations and new accident reports arrive in your sheet, CRM, Slack or agent as MSHA posts them.
- Open mines
- 13
- Operators
- 11
- Employees
- 118
- Active
- 11
- Intermittent
- 1
- Temporarily Idled
- 1
- Citations and orders since January 1, 2022
- 223
- Significant and substantial
- 57 (25.6%)
- Closure orders
- 11
- High negligence or reckless
- 29
- Proposed penalties
- $136,404
- Amount paid so far
- $107,969
- Inspections
- 138
- Inspector hours on site
- 1,293
- Citations per inspection
- 1.62 (all mines 2.30)
- Accident reports
- 15
- Injury and illness cases
- 15
- Fatalities
- 1
- Latest MSHA record
- October 28, 2026
Operators with the most open mines in San Diego County, California
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Superior Ready Mix Concrete L P | 2 | 32 | 89 | $82,182 | 6 |
| Martin Marietta San Diego Aggregates, LLC | 2 | 32 | 42 | $12,771 | 0 |
| Robertson's Ready Mix Ltd | 1 | 5 | 29 | $28,260 | 5 |
| Runts Trucking Inc. | 1 | 2 | 21 | $3,746 | 0 |
| CalMat Co | 1 | 32 | 16 | $4,663 | 4 |
| L & G Portable Crushing and Materials | 1 | 5 | 8 | $1,304 | 0 |
| Horizon Hill Materials, LLC | 1 | 2 | 7 | $1,035 | 0 |
| West Coast Rock and Sand | 1 | 3 | 5 | $739 | 0 |
| Ocean View Mines LLC | 1 | 3 | 4 | $1,410 | 0 |
| Mark R. Turvey Equipment Rental Inc. | 1 | 2 | 2 | $294 | 0 |
| Fisher Sand & Gravel Company | 1 | 0 | 0 | $0 | 0 |
Operators with the most citations in San Diego County, California
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Superior Ready Mix Concrete L P | 2 | 32 | 89 | $82,182 | 6 |
| Martin Marietta San Diego Aggregates, LLC | 2 | 32 | 42 | $12,771 | 0 |
| Robertson's Ready Mix Ltd | 1 | 5 | 29 | $28,260 | 5 |
| Runts Trucking Inc. | 1 | 2 | 21 | $3,746 | 0 |
| CalMat Co | 1 | 32 | 16 | $4,663 | 4 |
| L & G Portable Crushing and Materials | 1 | 5 | 8 | $1,304 | 0 |
| Horizon Hill Materials, LLC | 1 | 2 | 7 | $1,035 | 0 |
| West Coast Rock and Sand | 1 | 3 | 5 | $739 | 0 |
| Ocean View Mines LLC | 1 | 3 | 4 | $1,410 | 0 |
| Mark R. Turvey Equipment Rental Inc. | 1 | 2 | 2 | $294 | 0 |
| Fisher Sand & Gravel Company | 1 | 0 | 0 | $0 | 0 |
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 |
|---|---|---|---|---|---|
| Mission Gorge Plant | Superior Ready Mix Concrete L P | San Diego County, CA | Construction sand and gravel | 25 | 60 |
| Superior, Twin Oaks | Superior Ready Mix Concrete L P | San Diego County, CA | Crushed, broken stone | 7 | 29 |
| El Cajon Quarry | Robertson's Ready Mix Ltd | San Diego County, CA | Crushed, broken granite | 5 | 29 |
| Lakeside, Vigilante Aggregates | Martin Marietta San Diego Aggregates, LLC | San Diego County, CA | Construction sand and gravel | 22 | 21 |
| Santee Aggregates | Martin Marietta San Diego Aggregates, LLC | San Diego County, CA | Crushed, broken stone | 10 | 21 |
| Jerry Brown | Runts Trucking Inc. | San Diego County, CA | Dimension granite | 2 | 21 |
| Chula Vista Quarry | CalMat Co | San Diego County, CA | Construction sand and gravel | 32 | 16 |
| Poway Aggregates | L & G Portable Crushing and Materials | San Diego County, CA | Construction sand and gravel | 5 | 8 |
| Rosemary's Mountain Quarry | Horizon Hill Materials, LLC | San Diego County, CA | Iron ore | 2 | 7 |
| West Coast Rock and Sand | West Coast Rock and Sand | San Diego County, CA | Construction sand and gravel | 3 | 5 |
| Oceanview Mine | Ocean View Mines LLC | San Diego County, CA | Misc. nonmetallic mnls. | 3 | 4 |
| Turvey's Granite Pit | Mark R. Turvey Equipment Rental Inc. | San Diego County, CA | Construction sand and gravel | 2 | 2 |
| Fisher Industries Plant 27 | Fisher Sand & Gravel Company | San Diego County, CA | Construction sand and gravel | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 7 | 53.8% |
| Crushed, broken stone | 2 | 15.4% |
| Crushed, broken granite | 1 | 7.7% |
| Misc. nonmetallic mnls. | 1 | 7.7% |
| Iron ore | 1 | 7.7% |
| Dimension granite | 1 | 7.7% |
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 | 39 | 11 | $13,172 | 5 |
| 2023 | 68 | 25 | $62,679 | 6 |
| 2024 | 35 | 9 | $21,980 | 3 |
| 2025 | 43 | 7 | $24,932 | 1 |
| 2026 | 38 | 5 | $13,641 | 0 |
Standards cited most at mines in San Diego 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 56.14107 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 20 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 13 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 11 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 7 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 5 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 4 |
Injury and illness cases at mines in San Diego County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 9 |
| No lost time, or an occupational illness | 5 |
What the accident reports at mines in San Diego County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Disorders (repeated trauma) | 3 |
| Slip or fall of person | 3 |
| Handling of materials | 3 |
| Machinery | 3 |
| Stepping or kneeling on object | 2 |
| Handtools (nonpowered) | 1 |
Equipment named in accident reports at mines in San Diego County, California
| Equipment | Reports |
|---|---|
| Front-end loader | 2 |
| Hand tools (not powered) | 1 |
| Shovel | 1 |
| Welding machine | 1 |
| Crane | 1 |
| Bulldozer | 1 |
| Crusher | 1 |
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.