Data / Mines / Arizona / Plant 4
Plant 4, Yuma County, Arizona: 1 MSHA citation
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Plant 4 is a temporarily idled sand, industrial surface mine in Yuma County, Arizona, operated by Onyx Crushing AZ LLC with 0 employees on MSHA's record (mine ID 0203522). Since January 1, 2022 MSHA inspectors issued 1 citation and orders there with $151 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Plant 4 (MSHA mine ID 0203522) in Yuma County, Arizona: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0203522
- Status
- Temporarily Idled since August 17, 2026
- Main commodity
- Sand, industrial
- Mine type
- Surface
- County
- Yuma County, Arizona
- Nearest town
- Wellton
- Operator
- Onyx Crushing AZ LLC
- Employees
- 0
- MSHA field office
- Mesa South AZ Field Office
- Citations and orders since January 1, 2022
- 1
- Significant and substantial
- 0 (0.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $151
- Amount paid so far
- $151
- Inspections
- 1
- Inspector hours on site
- 0
- Citations per inspection
- 1.00 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- March 26, 2025
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 |
|---|---|---|---|---|
| 2025 | 1 | 0 | $151 | 0 |
Standards cited most at Plant 4
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 56.1000 | Surface metal and nonmetal mines | 1 |
Other open mines in Yuma County, Arizona
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Blaisdell | Dpe Materials, Inc | Yuma County, AZ | Construction sand and gravel | 13 | 18 |
| South Yuma Pit | Dpe Materials, Inc | Yuma County, AZ | Construction sand and gravel | 20 | 15 |
| Mohawk Rock | Pg&e LLC | Yuma County, AZ | Sand, common | 6 | 4 |
| Tacna Sand & Gravel LLC | Tacna Sand & Gravel LLC | Yuma County, AZ | Construction sand and gravel | 8 | 3 |
| Plant 1 | Onyx Crushing AZ LLC | Yuma County, AZ | Construction sand and gravel | 5 | 3 |
| Gce Blaisdell Mine | Gutierrez Canales Engineering, PC | Yuma County, AZ | Sand, industrial | 17 | 0 |
| Dome Valley Pit | Dpe Materials, Inc | Yuma County, AZ | Construction sand and gravel | 4 | 0 |
| Fisher Industries Plant 37 | Fisher Sand & Gravel Company | Yuma County, AZ | Construction sand and gravel | 0 | 0 |
| Cornerstone Wellton Mine | Cornerstone Aggregates Inc | Yuma County, AZ | Not stated | 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.