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.
126 citations across 1,038 inspection hours.
Source: MSHA inspections data, updated weekly.
MARANA PLANT has $28K in proposed MSHA penalties and $2K outstanding across 7 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.
$28K
proposed penalties
$25K
current assessed
$23K
paid to date
$2K
outstanding
125 assessments are final orders; 7 contested dockets.
Of $12K in penalties contested before the Commission, $4K was upheld in final decisions.
As of the most recent assessment on 2026-02-13.
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.
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.
10citations taken to the federal commission · 8% of citations on record
Settled
6 · 60%
Vacated or withdrawn
4 · 40%
50%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 6 decided S&S contests · industry: 79%
79%
Penalty reduction in decided contests
$9K proposed, $2K 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2018-04-26.
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.
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: 2024-02-29
13%
of limit-tested samples over the exposure limit
21
samples
8
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz81 over
Respirable dust, <.1mg11
Nuisance dust, respirable, <1% Qtz1
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (21)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2002-11-26
Quartz, respirable, >1% Qtz
0.68
0.5
1.36
Crusher Oper/Worker
2024-02-29
Respirable dust, <.1mg
0
Crusher Oper/Worker
2024-02-29
Respirable dust, <.1mg
0
Utility Man
2024-02-29
Respirable dust, <.1mg
0
Washer Operator
2024-02-29
Respirable dust, <.1mg
0
Washer Operator
2022-11-08
Quartz, respirable, >1% Qtz
0.13
Crusher Oper/Worker
2022-11-08
Quartz, respirable, >1% Qtz
0.3
0.79
0.38
Laborer, Bullgang
2022-11-08
Respirable dust, <.1mg
0
Washer Operator
2020-02-27
Unlisted Particulate, respirable, <1% Qtz
0.2
Washer Operator
2020-02-27
Respirable dust, <.1mg
0
Crusher Oper/Worker
2020-02-27
Respirable dust, <.1mg
0
Laborer, Bullgang
2020-02-27
Respirable dust, <.1mg
0
Crusher Oper/Worker
2017-11-15
Respirable dust, <.1mg
0
Front-end Loader Operator
2017-11-15
Quartz, respirable, >1% Qtz
0.13
0.51
0.25
Crusher Oper/Worker
2017-11-15
Respirable dust, <.1mg
0
Washer Operator
2009-06-18
Quartz, respirable, >1% Qtz
0.23
0.66
0.35
Crusher Oper/Worker
2009-06-18
Quartz, respirable, >1% Qtz
0.22
0.8
0.28
Laborer, Bullgang
2003-12-17
Quartz, respirable, >1% Qtz
0.21
0.43
0.49
Crusher Oper/Worker
2003-12-17
Nuisance dust, respirable, <1% Qtz
0.17
10
0.02
Front-end Loader Operator
2002-11-26
Quartz, respirable, >1% Qtz
0.26
0.41
0.63
Cleanup Man
2002-11-26
Respirable dust, <.1mg
0
Front-end Loader Operator
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.
MARANA PLANT recorded 0.00 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘ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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Arizona, metal and nonmetal mining averaged 1.81 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
2025 *
0.00
0.00
0.000
2024 *
0.00
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
4.56
0.00
0.000
2018 *
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
18
2025
20
2024
21
2023
25
2022
22
2021
21
2020
18
2019
18
2018
18
2017
20
2016
17
2015
16
2014
15
2013
15
2012
15
2011
17
2010
17
2009
13
2008
14
2007
18
2006
17
2005
19
2004
21
2003
15
2002
6
2001
2
Source: MSHA quarterly employment and production, updated weekly.
MARANA PLANT sits in Pima County, Arizona, where the Census mining category is 0.6% 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.
Pima County, Arizona · Population 1,049,947
0.6%
Mining share of county employment
$67,929
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
8,508
0
0
0.0
2026 Q1
9,490
1
0
105.4
2025 Q4
10,502
0
0
0.0
2025 Q3
11,140
0
0
0.0
2025 Q2
11,310
0
0
0.0
2025 Q1
11,203
1
0
89.3
2024 Q4
10,816
7
2
647.2
2024 Q3
11,384
0
0
0.0
Show 92 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
12,768
0
0
0.0
2024 Q1
11,513
0
0
0.0
2023 Q4
14,172
0
0
0.0
2023 Q3
14,548
0
0
0.0
2023 Q2
14,274
3
0
210.2
2023 Q1
13,574
0
0
0.0
2022 Q4
12,794
1
0
78.2
2022 Q3
12,623
0
0
0.0
2022 Q2
13,153
0
0
0.0
2022 Q1
10,803
2
1
185.1
2021 Q4
10,279
0
0
0.0
2021 Q3
12,819
0
0
0.0
2021 Q2
13,677
0
0
0.0
2021 Q1
11,915
0
0
0.0
2020 Q4
10,873
0
0
0.0
2020 Q3
11,309
0
0
0.0
2020 Q2
11,348
0
0
0.0
2020 Q1
12,213
0
0
0.0
2019 Q4
11,141
0
0
0.0
2019 Q3
11,299
1
0
88.5
2019 Q2
11,129
0
0
0.0
2019 Q1
10,284
0
0
0.0
2018 Q4
9,353
0
0
0.0
2018 Q3
10,709
0
0
0.0
2018 Q2
10,454
4
0
382.6
2018 Q1
11,720
0
0
0.0
2017 Q4
12,449
1
0
80.3
2017 Q3
12,268
1
0
81.5
2017 Q2
12,178
0
0
0.0
2017 Q1
12,119
1
0
82.5
2016 Q4
11,156
0
0
0.0
2016 Q3
11,105
0
0
0.0
2016 Q2
10,403
2
1
192.3
2016 Q1
11,118
5
1
449.7
2015 Q4
9,006
0
0
0.0
2015 Q3
9,040
0
0
0.0
2015 Q2
8,451
0
0
0.0
2015 Q1
7,652
0
0
0.0
2014 Q4
8,003
0
0
0.0
2014 Q3
7,833
6
0
766.0
2014 Q2
8,058
0
0
0.0
2014 Q1
7,938
2
0
252.0
2013 Q4
6,681
0
0
0.0
2013 Q3
7,738
0
0
0.0
2013 Q2
7,676
2
0
260.6
2013 Q1
7,007
0
0
0.0
2012 Q4
7,063
8
1
1132.7
2012 Q3
8,127
0
0
0.0
2012 Q2
7,064
5
0
707.8
2012 Q1
8,093
0
0
0.0
2011 Q4
7,207
5
1
693.8
2011 Q3
8,343
0
0
0.0
2011 Q2
8,301
2
0
240.9
2011 Q1
10,005
0
0
0.0
2010 Q4
9,813
2
0
203.8
2010 Q3
12,482
4
0
320.5
2010 Q2
12,542
1
1
79.7
2010 Q1
9,531
2
0
209.8
2009 Q4
9,367
1
0
106.8
2009 Q3
8,399
0
0
0.0
2009 Q2
7,345
2
0
272.3
2009 Q1
5,036
0
0
0.0
2008 Q4
6,632
0
0
0.0
2008 Q3
9,073
0
0
0.0
2008 Q2
10,415
0
0
0.0
2008 Q1
10,744
0
0
0.0
2007 Q4
10,494
1
0
95.3
2007 Q3
12,868
0
0
0.0
2007 Q2
12,237
0
0
0.0
2007 Q1
11,513
2
0
173.7
2006 Q4
9,896
1
0
101.1
2006 Q3
11,002
0
0
0.0
2006 Q2
11,790
0
0
0.0
2006 Q1
11,415
0
0
0.0
2005 Q4
10,085
4
0
396.6
2005 Q3
11,340
0
0
0.0
2005 Q2
13,992
0
0
0.0
2005 Q1
4,680
2
1
427.4
2004 Q4
11,330
0
0
0.0
2004 Q3
8,403
4
1
476.0
2004 Q2
14,650
4
3
273.0
2004 Q1
14,072
0
0
0.0
2003 Q4
4,710
2
0
424.6
2003 Q3
8,010
0
0
0.0
2003 Q2
13,684
0
0
0.0
2003 Q1
9,262
1
0
108.0
2002 Q4
3,579
7
3
1955.9
2002 Q3
4,193
1
0
238.5
2002 Q2
4,252
0
0
0.0
2002 Q1
526
0
0
0.0
2001 Q4
768
0
0
0.0
2001 Q3
1,134
6
0
5291.0
No fatalities recorded at this mine.
Reportable incidents
7 on file
2019 · 1 incident
November 4, 2019AZ · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSLIP OR FALL OF PERSON
CalMat Co · Struck by... (Not Elsewhere Classified)
Employee was using a utility knife cutting towards self cutting thigh.
2014 · 1 incident
March 24, 2014AZ · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDTOOLS (NONPOWERED)
CalMat Co · Over-exertion in pulling or pushing objects
The employee sought medical treatment and was placed on restricted duty , which is being accommodated. While pulling on a ratchet to turn a take-up bolt on a tail pulley located beneath the cone belt, the employee sprained his right shoulder.
2012 · 1 incident
August 16, 2012AZ · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDTOOLS (NONPOWERED)
CalMat Co · Struck by... (Not Elsewhere Classified)
The employee received dental treatment on 8/29/12, beyond first aid. The employee whipped a chain and hit his face resulting in a broken tooth.
CalMat Co · Fall to the walkway or working surface
Employee allegedly slipped and fell injuring his right shoulder. Employee was walking on wet concrete surface towards a sump pump to perform a repair. This became reportable when the employee was placed on restrictions on the initial visit on 10/24/2009.
2008 · 1 incident
April 2, 2008AZ · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDTOOLS (NONPOWERED)
Employee was working on a sand screw out of a course material washer which was supported by two jack stands. The log fell off crushing the right foot and causing a small laceration.