Data / Mines / California / Plaster City Quarry
Plaster City Quarry: 16 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Plaster City Quarry is an active gypsum surface mine in Imperial County, California, operated by United States Gypsum Company with 27 employees on MSHA's record (mine ID 0400915). Since January 1, 2022 MSHA inspectors issued 16 citations and orders there with $2,302 in proposed penalties, and 3 accident reports were filed there, with 3 injury or illness cases.
The request: Watch Plaster City Quarry (MSHA mine ID 0400915) in Imperial County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0400915
- Status
- Active since September 15, 1973
- Main commodity
- Gypsum
- Mine type
- Surface
- County
- Imperial County, California
- Nearest town
- Borrego Springs
- Operator
- United States Gypsum Company
- Parent company
- Usg Corporation
- Employees
- 27
- MSHA field office
- San Bernardino CA Field Office
- Citations and orders since January 1, 2022
- 16
- Significant and substantial
- 2 (12.5%)
- Closure orders
- 0
- High negligence or reckless
- 3
- Proposed penalties
- $2,302
- Amount paid so far
- $2,302
- Inspections
- 11
- Inspector hours on site
- 112
- Citations per inspection
- 1.45 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- July 1, 2026
- Citations issued to contractors here
- 1 ($183 proposed)
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 | 5 | 1 | $665 | 0 |
| 2023 | 4 | 0 | $584 | 0 |
| 2024 | 1 | 0 | $147 | 1 |
| 2025 | 3 | 1 | $453 | 1 |
| 2026 | 3 | 0 | $453 | 1 |
Standards cited most at Plaster City 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 50.30 | Reporting of accidents, injuries and illnesses | 3 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.3430 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 47.44 | Hazard communication | 1 |
| 30 CFR 56.17001 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Plaster City Quarry
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 2 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Plaster City Quarry describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 2 |
| Slip or fall of person | 1 |
Equipment named in accident reports at Plaster City Quarry
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
| Trucks | 1 |
| Chute | 1 |
Other open mines in Imperial County, California
| 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 |
| 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 |
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.