Key Takeaway
Mayer Onyx is a active surface mine producing SandAndGravel, located in Mayer, Yavapai County, AZ. It has 116 violations on record (40 S&S) and $62K in proposed penalties. Operated by Stoneworld Co..
Mayer Onyx
Operator: Stoneworld Co.
Controller: Ray Bosiljcic; Liliana Bosiljcic
Location: Mayer, Yavapai County, AZ
Employees: 5
Recent Violations
View all 116 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/25/2026 | 56.12028 | Non-S&S | ModNegligence | $0 |
| 01/15/2025 | 56.4201(a)(2) | Non-S&S | HighNegligence | $642 |
| 01/15/2025 | 56.9300(a) | S&S | HighNegligence | $3,184 |
| 05/21/2024 | 56.12032 | Non-S&S | ModNegligence | $679 |
| 01/18/2024 | Non-S&S | HighNegligence | $164 | |
| 12/19/2023 | 56.4401 | Non-S&S | ModNegligence | $576 |
| 12/19/2023 | 56.4430(c)(1) | Non-S&S | ModNegligence | $172 |
| 12/19/2023 | 56.4200(b)(1) | Non-S&S | ModNegligence | $260 |
| 12/19/2023 | 56.4130(b) | Non-S&S | ModNegligence | $260 |
| 12/19/2023 | 56.9300(a) | S&S | HighNegligence | $2,862 |
| 12/19/2023 | 56.9300(a) | S&S | HighNegligence | $2,862 |
| 12/19/2023 | 56.18002(a) | S&S | HighNegligence | $11,160 |
| 12/19/2023 | 56.14100(a) | S&S | ModNegligence | $935 |
| 12/18/2023 | 56.14103(b) | S&S | ModNegligence | $861 |
| 12/18/2023 | 56.4201(a)(2) | Non-S&S | ModNegligence | $260 |
| 12/18/2023 | 56.14100(c) | S&S | ModNegligence | $861 |
| 12/18/2023 | 56.11001 | S&S | ModNegligence | $861 |
| 12/18/2023 | 56.12032 | Non-S&S | ModNegligence | $260 |
| 12/18/2023 | 56.12008 | Non-S&S | ModNegligence | $172 |
| 12/18/2023 | 56.20011 | S&S | HighNegligence | $4,273 |
Inspections
View all 58 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/25/2026 | 02/25/2026 | 7.00 | 1 |
| 04/23/2025 | 04/23/2025 | 5.00 | 1 |
| 01/15/2025 | 01/16/2025 | 14.25 | 1 |
| 05/21/2024 | 05/24/2024 | 11.00 | 1 |
| 01/18/2024 | 01/22/2024 | 2.00 | 1 |
| 01/17/2024 | 01/18/2024 | 2.25 | 1 |
| 01/03/2024 | 01/03/2024 | 2.50 | 1 |
| 12/18/2023 | 12/21/2023 | 34.75 | 1 |
| 11/17/2023 | 11/17/2023 | 5.00 | 1 |
| 04/11/2023 | 04/14/2023 | 42.00 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Mayer Onyx have?
Mayer Onyx has 116 MSHA violations on record, of which 40 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $62K.
What type of mine is Mayer Onyx?
Mayer Onyx is a Surface mine producing SandAndGravel, located in Mayer, Yavapai County, AZ. It currently has 5 employees.
Has anyone been injured or killed at Mayer Onyx?
According to MSHA records, Mayer Onyx has 0 reported accident/injury records and 0 fatalities on file.
Who operates Mayer Onyx?
Mayer Onyx is operated by Stoneworld Co. and controlled by Ray Bosiljcic; Liliana Bosiljcic. MSHA Mine ID: 0202987.