Data / Mines / Arizona / Mayer Onyx
Mayer Onyx, Yavapai County, Arizona: 42 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Mayer Onyx is an active construction sand and gravel surface mine in Yavapai County, Arizona, operated by Stoneworld with 5 employees on MSHA's record (mine ID 0202987). Since January 1, 2022 MSHA inspectors issued 42 citations and orders there with $52,185 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Mayer Onyx (MSHA mine ID 0202987) in Yavapai County, Arizona: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0202987
- Status
- Active since April 21, 2021
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Yavapai County, Arizona
- Nearest town
- Mayer
- Operator
- Stoneworld
- Employees
- 5
- MSHA field office
- Mesa North AZ Field Office
- Citations and orders since January 1, 2022
- 42
- Significant and substantial
- 15 (35.7%)
- Closure orders
- 5
- High negligence or reckless
- 12
- Proposed penalties
- $52,185
- Amount paid so far
- $51,029
- Inspections
- 18
- Inspector hours on site
- 84
- Citations per inspection
- 2.33 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- May 27, 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 | 9 | 0 | $1,197 | 0 |
| 2023 | 28 | 14 | $46,168 | 0 |
| 2024 | 2 | 0 | $843 | 0 |
| 2025 | 2 | 1 | $3,826 | 0 |
| 2026 | 1 | 0 | $151 | 0 |
Standards cited most at Mayer Onyx
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 56.4201 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.20011 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14103 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.6132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.3130 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16003 | Surface metal and nonmetal mines | 1 |
Other open mines in Yavapai County, Arizona
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Freeport-McMoRan Bagdad Inc | Freeport-McMoRan Bagdad Inc | Yavapai County, AZ | Copper ore | 1,386 | 315 |
| Drake Cement | Drake Cement LLC | Yavapai County, AZ | Cement | 111 | 215 |
| Clarkdale Facility | Phoenix Cement | Yavapai County, AZ | Cement | 185 | 41 |
| Dewey Plant | Mdi Mining | Yavapai County, AZ | Construction sand and gravel | 8 | 25 |
| Henrietta Mine | Henrietta Mine, LLC | Yavapai County, AZ | Gold ore | 3 | 25 |
| Prescott Valley Pit | Arrowhead Materials | Yavapai County, AZ | Construction sand and gravel | 15 | 19 |
| FNF Crushing 8 | Fnf Construction Inc | Yavapai County, AZ | Construction sand and gravel | 0 | 19 |
| Clarkdale Plant #24 | Martin Marietta Materials, Inc. | Yavapai County, AZ | Construction sand and gravel | 9 | 18 |
| Charter Materials LLC (Plant 100) | Charter Materials LLC | Yavapai County, AZ | Construction sand and gravel | 8 | 18 |
| Cemex-Prescott/fain | Cemex Construction Materials South LLC | Yavapai County, AZ | Construction sand and gravel | 11 | 17 |
| Star Placer DBA: Big Bug Sand & Gravel | Carlin Trend Mining Supplies and Service | Yavapai County, AZ | Construction sand and gravel | 9 | 17 |
| Chino Pit | Arrowhead Mining & Materials LLC | Yavapai County, AZ | Construction sand and gravel | 14 | 13 |
| Em Materials LLC (Kirkland) | Em Materials, LLC | Yavapai County, AZ | Cement | 0 | 11 |
| Crusher #2 | Rock Pros USA | Yavapai County, AZ | Crushed, broken stone | 6 | 10 |
| Rockhouse Quarry | Drake Stone Products Inc | Yavapai County, AZ | Dimension sandstone | 15 | 8 |
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.