Data / Mines / California / Superior, Twin Oaks
Superior, Twin Oaks: 29 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Superior, Twin Oaks is an active crushed, broken stone surface mine in San Diego County, California, operated by Superior Ready Mix Concrete L P with 7 employees on MSHA's record (mine ID 0405514). Since January 1, 2022 MSHA inspectors issued 29 citations and orders there with $7,726 in proposed penalties, and 3 accident reports were filed there, with 3 injury or illness cases.
The request: Watch Superior, Twin Oaks (MSHA mine ID 0405514) in San Diego County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405514
- Status
- Active since March 14, 2002
- Main commodity
- Crushed, broken stone
- Mine type
- Surface
- County
- San Diego County, California
- Nearest town
- San Marcos
- Operator
- Superior Ready Mix Concrete L P
- Parent company
- Vulcan Materials Company
- Employees
- 7
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 29
- Significant and substantial
- 10 (34.5%)
- Closure orders
- 4
- High negligence or reckless
- 3
- Proposed penalties
- $7,726
- Amount paid so far
- $7,726
- Inspections
- 11
- Inspector hours on site
- 106
- Citations per inspection
- 2.64 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- May 19, 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 | 6 | 3 | $962 | 1 |
| 2023 | 17 | 6 | $5,053 | 0 |
| 2024 | 0 | 0 | $0 | 1 |
| 2025 | 6 | 1 | $1,711 | 1 |
Standards cited most at Superior, Twin Oaks
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 56.12032 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.20011 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 46.11 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14111 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Superior, Twin Oaks
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 3 |
What the accident reports at Superior, Twin Oaks describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 2 |
| Handling of materials | 1 |
Equipment named in accident reports at Superior, Twin Oaks
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
| Crusher | 1 |
Other open mines in San Diego County, California
| 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 |
| 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 |
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.