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Dewey Plant: 306 MSHA citations Metal/Non-Metal

MDI Mining · Surface
Controlled by Michael Denny
Mesa, Yavapai County, AZ  ·  Active
MSHA Mine ID: 0202633

Dewey Plant has $108K in proposed MSHA penalties and $12K outstanding across 4 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
5
Years on record
1995–2020
Latest incident
Aug 2020
Compliance record
MSHA citations since 2000
306
citations
109
significant & substantial
$108,320
proposed penalties
$82,339
paid to date
76% of proposed penalties paid to date, a $25,981 gap.
Source: MSHA violations data, updated weekly.
See MDI Mining's full MSHA compliance history →
Inspection activity
MSHA inspections since 2000
104
inspections on record
1,300
inspection hours
23.5
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.
306 citations across 1,300 inspection hours.
Source: MSHA inspections data, updated weekly.

Dewey Plant has $108K in proposed MSHA penalties and $12K outstanding across 4 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.
$108K
proposed penalties
$95K
current assessed
$82K
paid to date
$12K
outstanding
299 assessments are final orders; 4 contested dockets.
Of $21K in penalties contested before the Commission, $7K was upheld in final decisions.
As of the most recent assessment on 2026-04-02.
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.
36.2%
significant & substantial
7.0%
high negligence or reckless
36.2%
reasonably likely or greater
57.8%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 6.0% low, 87.0% moderate, 7.0% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘ Contesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
18 citations taken to the federal commission · 6% of citations on record
  • Settled 14 · 78%
  • Stood as issued 2 · 11%
  • Vacated or withdrawn 2 · 11%
75%
S&S designation survived the contest
ⓘ Counts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 12 decided S&S contests · industry: 79%
65%
Penalty reduction in decided contests
$21K proposed, $7K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2025-07-01.
Contested penalties
ⓘ A reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Docket Decision Judge Year Proposed / upheld
WEST 2020-0124 Settlement Simonton 2020 $8K → $572
WEST 2025-0154 Withdrawal Simonton 2026 $6K → $1K
WEST 2014-0843 Settlement Manning 2014 $3K → $2K
WEST 2015-0810 Default Lesnick 2016 $3K → $3K
Source: FMSHRC civil penalty dockets and decisions (public record), 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: 2026-04-02
17%
of limit-tested samples over the exposure limit
45
samples
30
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz305 over
  • Respirable dust, <.1mg11
  • Nuisance dust, respirable, <1% Qtz2
  • Arsenic fumes1
Show the individual readings (57)
Date Contaminant Concentration Limit Conc / limit Occupation
2006-07-11 Quartz, respirable, >1% Qtz 0.79 0.69 1.14 Front-end Loader Operator
2006-04-12 Quartz, respirable, >1% Qtz 1.35 0.51 2.65 Backhoe Operator
2006-04-12 Quartz, respirable, >1% Qtz 1.31 0.58 2.26 Front-end Loader Operator
2005-05-25 Quartz, respirable, >1% Qtz 0.67 0.67 1.00 Front-end Loader Operator
2005-05-25 Quartz, respirable, >1% Qtz 1.36 0.57 2.39 Laborer, Bullgang
2026-04-02 Nuisance dust, respirable, <1% Qtz 0.25 10 0.03 Rotary Bucket Ex. Operator
2026-04-02 Respirable dust, <.1mg 0 Laborer, Bullgang
2025-10-08 Respirable dust, <.1mg 0 Mechanic
2025-10-08 Respirable dust, <.1mg 0 Crusher Oper/Worker
2023-11-08 Quartz, respirable, >1% Qtz 0.25 Mechanic
2023-11-08 Quartz, respirable, >1% Qtz 0.18 0.98 0.18 Crusher Oper/Worker
2023-11-08 Quartz, respirable, >1% Qtz 0.17 Front-end Loader Operator
2023-11-08 Respirable dust, <.1mg 0 Mechanic
2019-04-17 Respirable dust, <.1mg 0 Mechanic
2019-04-17 Respirable dust, <.1mg 0 Crusher Oper/Worker
2019-04-17 Quartz, respirable, >1% Qtz 0.13 Truck Driver
2019-04-17 Quartz, respirable, >1% Qtz 0.32 Crusher Oper/Worker
2018-04-19 Cobalt fumes 0 100 0.00 Mechanic
2018-04-19 Quartz, respirable, >1% Qtz 0.49 1.15 0.43 Front-end Loader Operator
2018-04-19 Nuisance dust, respirable, <1% Qtz 0.17 10 0.02 Front-end Loader Operator
2018-04-19 Quartz, respirable, >1% Qtz 2.49 2.92 0.85 Mechanic
2018-04-19 Arsenic fumes 0 500 0.00 Mechanic
2018-04-19 Beryllium fumes 0 2 0.00 Mechanic
2018-04-19 Cadmium oxide fumes 0 100 0.00 Mechanic
2018-04-19 Chromium, insoluble 0 1 0.00 Mechanic
2018-04-19 Copper fumes 0 100 0.00 Mechanic
2018-04-19 Iron oxide fumes 0.21 10 0.02 Mechanic
2018-04-19 Lead fumes 0 150 0.00 Mechanic
2018-04-19 Magnesium oxide fumes 0 10 0.00 Mechanic
2018-04-19 Manganese fumes 0.04 5 0.01 Mechanic
2018-04-19 Molybdenum fumes 0 10 0.00 Mechanic
2018-04-19 Nickel fumes 0 1 0.00 Mechanic
2018-04-19 Vanadium fumes 0 50 0.00 Mechanic
2018-04-19 Zinc oxide fumes 0 5 0.00 Mechanic
2016-09-28 Respirable dust, <.1mg 0 Crusher Oper/Worker
2016-09-28 Respirable dust, <.1mg 0 Laborer, Bullgang
2013-12-18 Quartz, respirable, >1% Qtz 0.28 1.06 0.26 Laborer, Bullgang
2013-12-18 Quartz, respirable, >1% Qtz 0.21 1.11 0.19 Front-end Loader Operator
2013-12-18 Quartz, respirable, >1% Qtz 0.48 1.79 0.27 Mechanic
2009-05-07 Quartz, respirable, >1% Qtz 0.19 1.06 0.18 Truck Driver
2009-05-07 Quartz, respirable, >1% Qtz 0.3 0.67 0.45 Front-end Loader Operator
2009-05-07 Quartz, respirable, >1% Qtz 0.52 0.7 0.74 Crusher Oper/Worker
2009-05-07 Respirable dust, <.1mg 0 Laborer, Bullgang
2006-07-11 Quartz, respirable, >1% Qtz 0.33 0.73 0.45 Truck Driver
2006-07-11 Quartz, respirable, >1% Qtz 0.67 1.52 0.44 Shovel Operator
2006-07-11 Quartz, respirable, >1% Qtz 0.19 0.78 0.24 Front-end Loader Operator
2006-04-12 Quartz, respirable, >1% Qtz 0.37 0.63 0.59 Front-end Loader Operator
2006-04-12 Quartz, respirable, >1% Qtz 0.27 0.71 0.38 Complete Load-Haul-Dump
2005-08-10 Respirable dust, <.1mg 0 Laborer, Bullgang
2005-08-10 Quartz, respirable, >1% Qtz 0.42 0.96 0.44 Crusher Oper/Worker
2005-08-10 Quartz, respirable, >1% Qtz 0.19 1.94 0.10 Truck Driver
2005-08-10 Respirable dust, <.1mg 0 Mechanic
2005-05-25 Quartz, respirable, >1% Qtz 0.44 0.7 0.63 Front-end Loader Operator
2005-05-25 Quartz, respirable, >1% Qtz 0.16 0.75 0.21 Drill Operator, Rotary Air
2004-10-13 Quartz, respirable, >1% Qtz 0.44 0.49 0.90 Bulldozer Operator
2004-10-13 Quartz, respirable, >1% Qtz 0.27 0.57 0.47 Truck Driver
2004-10-13 Quartz, respirable, >1% Qtz 0.18 0.87 0.21 Drill Operator, Rotary Air
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.

Dewey Plant recorded 9.99 reportable injury cases per 100 full-time workers in 2008.

Injury rate, 2008
ⓘ This rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
9.99
total case rate
9.99
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 3.15 and the all-US-mining average was 3.61 cases per 100 workers.
In Arizona, metal and nonmetal mining averaged 3.99 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year total case rate days-away fatal
2008 * 9.99 9.99 0.000
2007 * 6.61 6.61 0.000
2006 * 6.72 0.00 0.000
2005 * 0.00 0.00 0.000
2004 * 0.00 0.00 0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Ownership history
  1. Mingus Rock 1994 to 1997
  2. MDI Mining 1997 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 7
2025 10
2024 11
2023 9
2022 14
2021 11
2020 11
2019 13
2018 12
2017 8
2016 8
2015 6
2014 6
2013 7
2012 5
2011 5
2010 5
2009 8
2008 10
2007 16
2006 14
2005 11
2004 10
2003 9
2002 7
2001 6
2000 4
Source: MSHA quarterly employment and production, updated weekly.

Dewey Plant 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 12 1 0 83333.3
2026 Q1 4,834 0 0 0.0
2025 Q4 3,093 0 0 0.0
2025 Q3 4,318 0 0 0.0
2025 Q2 3,525 2 0 567.4
2025 Q1 3,363 0 0 0.0
2024 Q4 3,576 4 0 1118.6
2024 Q3 4,085 2 1 489.6
Show 98 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 4,301 9 3 2092.5
2024 Q1 4,540 0 0 0.0
2023 Q4 3,904 2 0 512.3
2023 Q3 3,630 0 0 0.0
2023 Q2 3,668 3 0 817.9
2023 Q1 3,764 0 0 0.0
2022 Q4 3,731 1 0 268.0
2022 Q3 1,744 2 0 1146.8
2022 Q2 5,089 0 0 0.0
2022 Q1 3,826 0 0 0.0
2021 Q4 3,723 5 0 1343.0
2021 Q3 4,517 3 0 664.2
2021 Q2 4,977 0 0 0.0
2021 Q1 4,341 2 0 460.7
2020 Q4 4,593 0 0 0.0
2020 Q3 4,287 0 0 0.0
2020 Q2 3,890 8 1 2056.6
2020 Q1 4,212 0 0 0.0
2019 Q4 4,725 19 8 4021.2
2019 Q3 4,446 3 2 674.8
2019 Q2 4,491 14 7 3117.3
2019 Q1 4,297 0 0 0.0
2018 Q4 3,938 10 5 2539.4
2018 Q3 3,543 0 0 0.0
2018 Q2 3,595 1 0 278.2
2018 Q1 3,279 0 0 0.0
2017 Q4 2,922 3 1 1026.7
2017 Q3 3,163 2 1 632.3
2017 Q2 4,008 4 1 998.0
2017 Q1 3,332 0 0 0.0
2016 Q4 3,505 7 4 1997.1
2016 Q3 4,211 0 0 0.0
2016 Q2 3,803 0 0 0.0
2016 Q1 2,685 3 1 1117.3
2015 Q4 3,159 0 0 0.0
2015 Q3 3,265 0 0 0.0
2015 Q2 2,985 5 2 1675.0
2015 Q1 2,684 0 0 0.0
2014 Q4 2,647 7 1 2644.5
2014 Q3 2,404 0 0 0.0
2014 Q2 3,444 23 13 6678.3
2014 Q1 3,266 0 0 0.0
2013 Q4 3,413 7 3 2051.0
2013 Q3 3,226 0 0 0.0
2013 Q2 2,877 0 0 0.0
2013 Q1 2,572 1 0 388.8
2012 Q4 2,397 0 0 0.0
2012 Q3 2,361 0 0 0.0
2012 Q2 2,115 0 0 0.0
2012 Q1 1,851 0 0 0.0
2011 Q4 2,439 1 0 410.0
2011 Q3 2,797 2 1 715.1
2011 Q2 2,459 0 0 0.0
2011 Q1 2,274 0 0 0.0
2010 Q4 2,547 4 1 1570.5
2010 Q3 2,458 0 0 0.0
2010 Q2 2,492 8 1 3210.3
2010 Q1 1,687 8 2 4742.1
2009 Q4 2,467 0 0 0.0
2009 Q3 2,984 0 0 0.0
2009 Q2 2,974 20 7 6724.9
2009 Q1 3,266 0 0 0.0
2008 Q4 4,487 10 2 2228.7
2008 Q3 7,111 0 0 0.0
2008 Q2 4,744 3 1 632.4
2008 Q1 3,677 6 2 1631.8
2007 Q4 7,263 0 0 0.0
2007 Q3 7,389 2 0 270.7
2007 Q2 8,251 0 0 0.0
2007 Q1 7,347 7 3 952.8
2006 Q4 6,789 3 1 441.9
2006 Q3 8,320 0 0 0.0
2006 Q2 8,007 6 3 749.3
2006 Q1 6,634 0 0 0.0
2005 Q4 6,789 11 1 1620.3
2005 Q3 6,183 0 0 0.0
2005 Q2 6,870 13 6 1892.3
2005 Q1 5,247 0 0 0.0
2004 Q4 5,335 6 2 1124.6
2004 Q3 6,545 7 4 1069.5
2004 Q2 5,560 14 9 2518.0
2004 Q1 4,230 0 0 0.0
2003 Q4 6,298 0 0 0.0
2003 Q3 5,987 0 0 0.0
2003 Q2 6,024 0 0 0.0
2003 Q1 1,363 6 4 4402.1
2002 Q4 5,188 0 0 0.0
2002 Q3 4,433 0 0 0.0
2002 Q2 4,261 6 3 1408.1
2002 Q1 3,870 0 0 0.0
2001 Q4 2,914 0 0 0.0
2001 Q3 3,677 1 0 272.0
2001 Q2 3,242 0 0 0.0
2001 Q1 2,165 0 0 0.0
2000 Q4 2,544 5 1 1965.4
2000 Q3 2,862 0 0 0.0
2000 Q2 2,180 0 0 0.0
2000 Q1 1,362 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

5 on file

2020 · 1 incident

August 10, 2020 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
MDI Mining · Struck by flying object

Employee was operating Jaw Crusher mining machine when the jaw became plugged. The employee was attempting to unplug the jaw when a piece of rock/debris flew from the machine and struck the employee in hard hat, penetrating the PPE. The impact caused a laceration in the employee's forehead.

2008 · 1 incident

February 19, 2008 AZ · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
MDI Mining · Fall onto or against objects

Loss of footing and slipped off ladder, striking robs on upper deck. Rib contusion on his left side.

2007 · 1 incident

March 12, 2007 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
MDI Mining · Struck against a moving object

Hauling 4000 gallons of water up steep grade, truck came out of gear. Operator, unable to get it back in gear, decided to back truck down the hill. Watching for traffic on the right, he negotiated a turn to the left going backward. He failed to see a high spot on the bank and the left drive tires went up on this spot causing the water to shift laying the truck on its side.

2006 · 1 incident

December 7, 2006 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
MDI Mining · Fall onto or against objects

Injured was conversing with excavator operator about loads while standing on track. Injured then tried to step off track facing forward instead of using foot steps. He lost his footing and slid down track causing abrasions to his lumbar area. The grouser on the track pad causing the most abrasion and discomfort.

1995 · 1 incident

March 24, 1995 AZ · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
Mingus Rock · Struck against a moving object

LOADER OPERAATOR WAS DRIVING TO FAST AND WAS NOT PAYING ATTENTION WHEN HE WENT OFF AN EMBANKMENT, IT WA A 2 FOOT DROP. THE LOADED OPERATOR HA HIS SEAT BEL TON & WS THROWN FORWARD CAUSING BRUI SES AROUND WAIST DUE TO THE SEAT BELT CATCHING.