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: 409 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
ARL-501 has $12K in proposed MSHA penalties and $302 outstanding across 1 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.
$12K
proposed penalties
$10K
current assessed
$10K
paid to date
$302
outstanding
70 assessments are final orders; 1 contested dockets.
Of $3K in penalties contested before the Commission, $544 was upheld in final decisions.
As of the most recent assessment on 2026-07-14.
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.
4citations taken to the federal commission · 6% of citations on record
Settled
4 · 100%
0%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 2 decided S&S contests · industry: 79%
81%
Penalty reduction in decided contests
$3K proposed, $544 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2020-07-09.
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: 2023-04-12, 3 years ago
0%
of limit-tested samples over the exposure limit
13
samples
2
limit-tested
Most sampled contaminants
Respirable dust, <.1mg10
Nuisance dust, respirable, <1% Qtz2
Quartz, respirable, >1% Qtz1
Show the individual readings (13)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-04-12
Quartz, respirable, >1% Qtz
0.72
Dredge/Barge Operator
2023-04-12
Respirable dust, <.1mg
0
Clam Shell Operator
2020-05-05
Nuisance dust, respirable, <1% Qtz
0.31
10
0.03
Dredge/Barge Operator
2020-05-05
Nuisance dust, respirable, <1% Qtz
1.44
10
0.14
Dredge/Barge Operator
2020-05-05
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2015-10-21
Respirable dust, <.1mg
0
Dredge/Barge Operator
2015-10-21
Respirable dust, <.1mg
0
Utility Man
2015-10-21
Respirable dust, <.1mg
0
Clam Shell Operator
2013-10-29
Respirable dust, <.1mg
0
Dredge/Barge Operator
2013-10-29
Respirable dust, <.1mg
0
Dredge/Barge Operator
2010-11-10
Respirable dust, <.1mg
0
Clam Shell Operator
2010-11-10
Respirable dust, <.1mg
0
Dredge/Barge Operator
2010-11-10
Respirable dust, <.1mg
0
Dredge/Barge 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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
4
2025
3
2024
4
2023
4
2022
4
2021
4
2020
4
2019
5
2018
5
2017
4
2016
4
2015
5
2014
4
2013
4
2012
4
2011
5
2010
6
2009
5
2008
4
2007
4
2006
5
Source: MSHA quarterly employment and production, updated weekly.
ARL-501 sits in Montgomery County, Missouri, where the Census mining category is 0.4% 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.
Montgomery County, Missouri · Population 11,422
0.4%
Mining share of county employment
$61,042
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
3,442
0
0
0.0
2026 Q1
2,043
0
0
0.0
2025 Q4
2,807
2
1
712.5
2025 Q3
2,892
1
0
345.8
2025 Q2
2,840
0
0
0.0
2025 Q1
1,916
2
0
1043.8
2024 Q4
2,589
0
0
0.0
2024 Q3
3,039
1
0
329.1
Show 73 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
3,320
0
0
0.0
2024 Q1
3,039
0
0
0.0
2023 Q4
3,928
2
0
509.2
2023 Q3
3,960
0
0
0.0
2023 Q2
3,233
2
1
618.6
2023 Q1
2,359
10
0
4239.1
2022 Q4
2,864
0
0
0.0
2022 Q3
2,867
1
0
348.8
2022 Q2
3,002
0
0
0.0
2022 Q1
2,080
0
0
0.0
2021 Q4
2,797
0
0
0.0
2021 Q3
2,964
5
2
1686.9
2021 Q2
2,994
0
0
0.0
2021 Q1
2,482
1
0
402.9
2020 Q4
3,643
0
0
0.0
2020 Q3
3,309
0
0
0.0
2020 Q2
3,033
8
1
2637.7
2020 Q1
2,529
2
0
790.8
2019 Q4
3,011
0
0
0.0
2019 Q3
2,232
0
0
0.0
2019 Q2
2,396
4
3
1669.4
2019 Q1
960
0
0
0.0
2018 Q4
3,059
0
0
0.0
2018 Q3
3,152
0
0
0.0
2018 Q2
2,564
0
0
0.0
2018 Q1
2,012
0
0
0.0
2017 Q4
3,223
0
0
0.0
2017 Q3
2,319
5
1
2156.1
2017 Q2
3,133
0
0
0.0
2017 Q1
2,811
0
0
0.0
2016 Q4
3,054
0
0
0.0
2016 Q3
3,312
0
0
0.0
2016 Q2
2,603
0
0
0.0
2016 Q1
997
0
0
0.0
2015 Q4
2,621
8
2
3052.3
2015 Q3
3,118
0
0
0.0
2015 Q2
2,340
0
0
0.0
2015 Q1
1,389
1
0
719.9
2014 Q4
2,189
1
0
456.8
2014 Q3
2,342
0
0
0.0
2014 Q2
2,862
0
0
0.0
2014 Q1
1,492
0
0
0.0
2013 Q4
1,751
1
0
571.1
2013 Q3
2,164
0
0
0.0
2013 Q2
1,605
0
0
0.0
2013 Q1
466
0
0
0.0
2012 Q4
1,749
1
1
571.8
2012 Q3
1,317
0
0
0.0
2012 Q2
1,449
0
0
0.0
2012 Q1
906
2
2
2207.5
2011 Q4
2,436
0
0
0.0
2011 Q3
2,624
0
0
0.0
2011 Q2
2,703
0
0
0.0
2011 Q1
564
0
0
0.0
2010 Q4
2,663
1
0
375.5
2010 Q3
3,666
0
0
0.0
2010 Q2
3,482
3
1
861.6
2010 Q1
808
0
0
0.0
2009 Q4
2,240
0
0
0.0
2009 Q3
1,174
0
0
0.0
2009 Q2
1,838
1
0
544.1
2009 Q1
2,234
0
0
0.0
2008 Q4
2,067
0
0
0.0
2008 Q3
2,856
0
0
0.0
2008 Q2
2,691
0
0
0.0
2008 Q1
2,242
0
0
0.0
2007 Q4
1,791
0
0
0.0
2007 Q3
1,888
2
0
1059.3
2007 Q2
2,046
0
0
0.0
2007 Q1
1,268
2
0
1577.3
2006 Q4
1,375
0
0
0.0
2006 Q3
2,328
1
0
429.6
2006 Q2
2,960
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
4 on file
2017 · 1 incident
May 12, 2017MO · Metal/Non-Metalbarge/boat/dredge/towbarge/towboat/leach operator, riverman, deck handHANDLING OF MATERIALS
They were picking up the spud on the dock barge. A coworker was operating the spud winch & he took the pressure off the pin that holds the spud. When the spud was lifted the EE grabbed the pin to pull it out, the spud suddenly dropped smashing two of his fingers. Per phone call one lacerated, one amputated to first knuckle.
2012 · 1 incident
June 25, 2012MO · Metal/Non-Metalbarge/boat/dredge/towbarge/towboat/leach operator, riverman, deck handHANDLING OF MATERIALS
EE removed the guard on the port anchor winch and put his right hand on the drive chain, when the winch suddenly moved and his right hand thumb went through the sprocket and chain. Punctured a hole in his right thumb nail and splitting the bone to the first knuckle.