Mayer Onyx: 116 MSHA citations Metal/Non-Metal
Mayer Onyx has $62K in proposed MSHA penalties and $1K outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2004
116
citations
40
significant & substantial
$61,777
proposed penalties
$60,621
paid to date
98% of proposed penalties paid to date, a $1,156 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2004
60
inspections on record
508
inspection hours
n/a
citations per 100 inspection hours
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Rate withheld: 508 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Mayer Onyx has $62K in proposed MSHA penalties and $1K outstanding across 0 contested dockets.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$62K
proposed penalties
$62K
current assessed
$61K
paid to date
$1K
outstanding
111 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-02-25.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘ
Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.36.0%
significant & substantial
17.1%
high negligence or reckless
36.0%
reasonably likely or greater
41.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 0.0% low, 82.9% moderate, 17.1% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
Health sampling
ⓘ
A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.Metal and nonmetal contaminants (personal samples)
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2023-12-19
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.9
samples
0
limit-tested
Most sampled contaminants
- Respirable dust, <.1mg9
Show the individual readings (9)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2023-12-19 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2023-12-19 | Respirable dust, <.1mg | 0 | Stone Polisher/Cutter | ||
| 2023-12-19 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2023-12-19 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2019-03-19 | Respirable dust, <.1mg | 0 | Stone Polisher/Cutter | ||
| 2019-03-19 | Respirable dust, <.1mg | 0 | Stone Polisher/Cutter | ||
| 2016-09-27 | Respirable dust, <.1mg | 0 | Mechanic | ||
| 2016-09-27 | Respirable dust, <.1mg | 0 | Mechanic | ||
| 2016-09-27 | Respirable dust, <.1mg | 0 | Laborer, Bullgang |
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Ownership history
- Stoneworld Co. 2002 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 4 |
| 2025 | 6 |
| 2024 | 8 |
| 2023 | 7 |
| 2022 | 5 |
| 2021 | 4 |
| 2020 | 3 |
| 2019 | 3 |
| 2018 | 4 |
| 2017 | 4 |
| 2016 | 3 |
| 2015 | 2 |
| 2014 | 1 |
| 2013 | 0 |
| 2012 | 1 |
| 2011 | 2 |
| 2010 | 2 |
| 2009 | 2 |
| 2008 | 2 |
| 2007 | 2 |
| 2006 | 2 |
| 2005 | 3 |
| 2004 | 2 |
| 2003 | 1 |
| 2002 | 2 |
Source: MSHA quarterly employment and production, updated weekly.
Mayer Onyx sits in Yavapai County, Arizona, where the Census mining category is 1.2% of county employment.
Local economic context
ⓘ
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.Yavapai County, Arizona · Population 241,656
1.2%
Mining share of county employment
$66,106
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
Quarterly safety rates
ⓘ
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2026 Q2 | 1,920 | 0 | 0 | 0.0 |
| 2026 Q1 | 1,920 | 1 | 0 | 520.8 |
| 2025 Q4 | 2,544 | 0 | 0 | 0.0 |
| 2025 Q3 | 2,880 | 0 | 0 | 0.0 |
| 2025 Q2 | 2,736 | 0 | 0 | 0.0 |
| 2025 Q1 | 2,784 | 2 | 1 | 718.4 |
| 2024 Q4 | 3,136 | 0 | 0 | 0.0 |
| 2024 Q3 | 3,456 | 0 | 0 | 0.0 |
Show 87 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 4,160 | 1 | 0 | 240.4 |
| 2024 Q1 | 3,648 | 1 | 0 | 274.1 |
| 2023 Q4 | 2,880 | 15 | 8 | 5208.3 |
| 2023 Q3 | 5,040 | 0 | 0 | 0.0 |
| 2023 Q2 | 3,120 | 13 | 6 | 4166.7 |
| 2023 Q1 | 2,928 | 0 | 0 | 0.0 |
| 2022 Q4 | 2,736 | 3 | 0 | 1096.5 |
| 2022 Q3 | 2,016 | 0 | 0 | 0.0 |
| 2022 Q2 | 1,920 | 0 | 0 | 0.0 |
| 2022 Q1 | 2,048 | 6 | 0 | 2929.7 |
| 2021 Q4 | 2,016 | 0 | 0 | 0.0 |
| 2021 Q3 | 2,080 | 0 | 0 | 0.0 |
| 2021 Q2 | 1,952 | 0 | 0 | 0.0 |
| 2021 Q1 | 2,016 | 0 | 0 | 0.0 |
| 2020 Q4 | 1,920 | 2 | 0 | 1041.7 |
| 2020 Q3 | 1,536 | 0 | 0 | 0.0 |
| 2020 Q2 | 1,536 | 8 | 6 | 5208.3 |
| 2020 Q1 | 1,320 | 0 | 0 | 0.0 |
| 2019 Q4 | 720 | 0 | 0 | 0.0 |
| 2019 Q3 | 1,536 | 0 | 0 | 0.0 |
| 2019 Q2 | 1,536 | 0 | 0 | 0.0 |
| 2019 Q1 | 1,248 | 2 | 0 | 1602.6 |
| 2018 Q4 | 1,320 | 0 | 0 | 0.0 |
| 2018 Q3 | 1,440 | 0 | 0 | 0.0 |
| 2018 Q2 | 1,984 | 0 | 0 | 0.0 |
| 2018 Q1 | 2,016 | 1 | 0 | 496.0 |
| 2017 Q4 | 1,984 | 7 | 3 | 3528.2 |
| 2017 Q3 | 2,016 | 0 | 0 | 0.0 |
| 2017 Q2 | 1,488 | 0 | 0 | 0.0 |
| 2017 Q1 | 1,536 | 0 | 0 | 0.0 |
| 2016 Q4 | 1,368 | 2 | 0 | 1462.0 |
| 2016 Q3 | 2,048 | 0 | 0 | 0.0 |
| 2016 Q2 | 960 | 0 | 0 | 0.0 |
| 2016 Q1 | 960 | 1 | 0 | 1041.7 |
| 2015 Q4 | 960 | 0 | 0 | 0.0 |
| 2015 Q3 | 992 | 0 | 0 | 0.0 |
| 2015 Q2 | 1,008 | 0 | 0 | 0.0 |
| 2015 Q1 | 928 | 8 | 4 | 8620.7 |
| 2014 Q4 | 544 | 0 | 0 | 0.0 |
| 2014 Q3 | 0 | 0 | 0 | |
| 2014 Q2 | 0 | 0 | 0 | |
| 2014 Q1 | 0 | 0 | 0 | |
| 2013 Q4 | 0 | 0 | 0 | |
| 2013 Q3 | 0 | 0 | 0 | |
| 2013 Q2 | 0 | 0 | 0 | |
| 2013 Q1 | 0 | 0 | 0 | |
| 2012 Q4 | 8 | 0 | 0 | 0.0 |
| 2012 Q3 | 8 | 4 | 0 | 500000.0 |
| 2012 Q2 | 48 | 0 | 0 | 0.0 |
| 2012 Q1 | 640 | 0 | 0 | 0.0 |
| 2011 Q4 | 480 | 0 | 0 | 0.0 |
| 2011 Q3 | 448 | 9 | 3 | 20089.3 |
| 2011 Q2 | 0 | 0 | 0 | |
| 2011 Q1 | 464 | 0 | 0 | 0.0 |
| 2010 Q4 | 944 | 0 | 0 | 0.0 |
| 2010 Q3 | 752 | 0 | 0 | 0.0 |
| 2010 Q2 | 784 | 7 | 3 | 8928.6 |
| 2010 Q1 | 736 | 0 | 0 | 0.0 |
| 2009 Q4 | 480 | 0 | 0 | 0.0 |
| 2009 Q3 | 0 | 0 | 0 | |
| 2009 Q2 | 368 | 0 | 0 | 0.0 |
| 2009 Q1 | 880 | 0 | 0 | 0.0 |
| 2008 Q4 | 816 | 11 | 4 | 13480.4 |
| 2008 Q3 | 688 | 0 | 0 | 0.0 |
| 2008 Q2 | 1,024 | 0 | 0 | 0.0 |
| 2008 Q1 | 576 | 0 | 0 | 0.0 |
| 2007 Q4 | 544 | 0 | 0 | 0.0 |
| 2007 Q3 | 704 | 0 | 0 | 0.0 |
| 2007 Q2 | 736 | 0 | 0 | 0.0 |
| 2007 Q1 | 1,024 | 0 | 0 | 0.0 |
| 2006 Q4 | 256 | 0 | 0 | 0.0 |
| 2006 Q3 | 848 | 0 | 0 | 0.0 |
| 2006 Q2 | 416 | 0 | 0 | 0.0 |
| 2006 Q1 | 480 | 0 | 0 | 0.0 |
| 2005 Q4 | 507 | 6 | 1 | 11834.3 |
| 2005 Q3 | 1,560 | 0 | 0 | 0.0 |
| 2005 Q2 | 1,488 | 0 | 0 | 0.0 |
| 2005 Q1 | 672 | 0 | 0 | 0.0 |
| 2004 Q4 | 1,008 | 3 | 1 | 2976.2 |
| 2004 Q3 | 1,024 | 1 | 0 | 976.6 |
| 2004 Q2 | 480 | 1 | 0 | 2083.3 |
| 2004 Q1 | 640 | 1 | 0 | 1562.5 |
| 2003 Q4 | 608 | 0 | 0 | 0.0 |
| 2003 Q3 | 0 | 0 | 0 | |
| 2003 Q2 | 0 | 0 | 0 | |
| 2003 Q1 | 144 | 0 | 0 | 0.0 |
| 2002 Q4 | 480 | 0 | 0 | 0.0 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.