Data / Mines / California / Imperial County
Mines in Imperial County, California: 9 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 9 open mines in Imperial County, California, run by 7 operators and employing 337 people. Since January 1, 2022 its inspectors issued 110 citations and orders there with $35,703 in proposed penalties, and operators reported 17 injury or illness cases. The operators with the most open mines are Imperial Valley Aggregates LLC; Pyramid Construction and Aggregates, Inc.; Western Mesquite Mines, Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 9
- Operators
- 7
- Employees
- 337
- Active
- 7
- Intermittent
- 2
- Citations and orders since January 1, 2022
- 110
- Significant and substantial
- 22 (20.0%)
- Closure orders
- 0
- High negligence or reckless
- 11
- Proposed penalties
- $35,703
- Amount paid so far
- $27,515
- Inspections
- 93
- Inspector hours on site
- 744
- Citations per inspection
- 1.18 (all mines 2.30)
- Accident reports
- 17
- Injury and illness cases
- 17
- Fatalities
- 0
- Latest MSHA record
- October 30, 2026
Operators with the most open mines in Imperial 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 |
|---|---|---|---|---|---|
| Imperial Valley Aggregates LLC | 2 | 7 | 21 | $3,609 | 0 |
| Pyramid Construction and Aggregates, Inc. | 2 | 7 | 7 | $1,055 | 0 |
| Western Mesquite Mines, Inc. | 1 | 277 | 30 | $23,145 | 14 |
| Cal-Grade Inc | 1 | 6 | 17 | $2,758 | 0 |
| Aggregate Products Inc | 1 | 11 | 16 | $2,364 | 0 |
| United States Gypsum Company | 1 | 27 | 16 | $2,302 | 3 |
| Superior Ready Mix Concrete L P | 1 | 2 | 3 | $470 | 0 |
Operators with the most citations in Imperial 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 |
|---|---|---|---|---|---|
| Western Mesquite Mines, Inc. | 1 | 277 | 30 | $23,145 | 14 |
| Imperial Valley Aggregates LLC | 2 | 7 | 21 | $3,609 | 0 |
| Cal-Grade Inc | 1 | 6 | 17 | $2,758 | 0 |
| Aggregate Products Inc | 1 | 11 | 16 | $2,364 | 0 |
| United States Gypsum Company | 1 | 27 | 16 | $2,302 | 3 |
| Pyramid Construction and Aggregates, Inc. | 2 | 7 | 7 | $1,055 | 0 |
| Superior Ready Mix Concrete L P | 1 | 2 | 3 | $470 | 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 |
|---|---|---|---|---|---|
| Mesquite | Western Mesquite Mines, Inc. | Imperial County, CA | Gold ore | 277 | 30 |
| Crushing Screening | Cal-Grade Inc | Imperial County, CA | Construction sand and gravel | 6 | 17 |
| Plaster City Quarry | United States Gypsum Company | Imperial County, CA | Gypsum | 27 | 16 |
| Api Pit | Aggregate Products Inc | Imperial County, CA | Construction sand and gravel | 11 | 16 |
| Frink | Imperial Valley Aggregates LLC | Imperial County, CA | Construction sand and gravel | 2 | 14 |
| Imperial Valley Aggregates | Imperial Valley Aggregates LLC | Imperial County, CA | Construction sand and gravel | 5 | 7 |
| Ammex Site | Pyramid Construction and Aggregates, Inc. | Imperial County, CA | Construction sand and gravel | 5 | 6 |
| Frink Pit | Superior Ready Mix Concrete L P | Imperial County, CA | Construction sand and gravel | 2 | 3 |
| American Girl Mine East | Pyramid Construction and Aggregates, Inc. | Imperial County, CA | Crushed, broken stone | 2 | 1 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 6 | 66.7% |
| Gypsum | 1 | 11.1% |
| Gold ore | 1 | 11.1% |
| Crushed, broken stone | 1 | 11.1% |
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 | 35 | 3 | $5,199 | 4 |
| 2023 | 20 | 5 | $18,106 | 2 |
| 2024 | 26 | 8 | $7,925 | 6 |
| 2025 | 16 | 4 | $2,484 | 2 |
| 2026 | 13 | 2 | $1,989 | 3 |
Standards cited most at mines in Imperial 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 56.14100 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 8 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 7 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 4 |
| 30 CFR 47.44 | Hazard communication | 4 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 3 |
Injury and illness cases at mines in Imperial County, California
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 11 |
| No lost time, or an occupational illness | 6 |
What the accident reports at mines in Imperial County, California describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 10 |
| Slip or fall of person | 3 |
| Handtools (nonpowered) | 2 |
| Machinery | 1 |
| Stepping or kneeling on object | 1 |
Equipment named in accident reports at mines in Imperial County, California
| Equipment | Reports |
|---|---|
| Shovel | 2 |
| Hand tools (not powered) | 2 |
| Front-end loader | 1 |
| Trucks | 1 |
| Chute | 1 |
| Road grader | 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.