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: 455 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Monmouth Pit has $20K in proposed MSHA penalties and $5 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.
$20K
proposed penalties
$20K
current assessed
$20K
paid to date
$5
outstanding
93 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-02-10.
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.
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: 2018-04-18, 8 years ago
0%
of limit-tested samples over the exposure limit
3
samples
3
limit-tested
Most sampled contaminants
Nuisance dust, respirable, <1% Qtz2
Nuisance dust, total, <1% Qtz1
Show the individual readings (3)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2018-04-18
Nuisance dust, respirable, <1% Qtz
0.12
10
0.01
Scale Man
2018-04-18
Nuisance dust, total, <1% Qtz
0.77
10
0.08
Front-end Loader Operator
2014-09-23
Nuisance dust, respirable, <1% Qtz
0.13
10
0.01
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
6
2025
6
2024
6
2023
6
2022
5
2021
6
2020
4
2019
3
2018
2
2017
2
2016
2
2015
2
2014
3
2013
3
2012
3
Source: MSHA quarterly employment and production, updated weekly.
Monmouth Pit sits in Warren County, Illinois, where the Census mining category is 0.3% 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.
Warren County, Illinois · Population 16,576
0.3%
Mining share of county employment
$64,650
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
3,508
0
0
0.0
2026 Q1
3,079
3
1
974.3
2025 Q4
3,395
0
0
0.0
2025 Q3
3,183
0
0
0.0
2025 Q2
2,358
0
0
0.0
2025 Q1
3,147
3
0
953.3
2024 Q4
3,190
0
0
0.0
2024 Q3
3,180
11
0
3459.1
Show 47 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
2,535
0
0
0.0
2024 Q1
2,668
7
1
2623.7
2023 Q4
2,772
0
0
0.0
2023 Q3
2,971
0
0
0.0
2023 Q2
2,808
23
7
8190.9
2023 Q1
2,524
0
0
0.0
2022 Q4
2,155
0
0
0.0
2022 Q3
2,316
0
0
0.0
2022 Q2
3,096
0
0
0.0
2022 Q1
2,664
9
2
3378.4
2021 Q4
2,525
0
0
0.0
2021 Q3
3,472
10
2
2880.2
2021 Q2
1,318
0
0
0.0
2021 Q1
2,967
0
0
0.0
2020 Q4
2,111
0
0
0.0
2020 Q3
2,230
0
0
0.0
2020 Q2
2,752
0
0
0.0
2020 Q1
1,718
0
0
0.0
2019 Q4
2,482
1
0
402.9
2019 Q1
715
0
0
0.0
2018 Q4
774
3
1
3876.0
2018 Q3
1,206
0
0
0.0
2018 Q2
1,112
0
0
0.0
2018 Q1
1,156
0
0
0.0
2017 Q4
1,072
0
0
0.0
2017 Q3
1,136
0
0
0.0
2017 Q2
1,117
2
0
1790.5
2017 Q1
622
0
0
0.0
2016 Q4
1,149
1
1
870.3
2016 Q3
1,134
0
0
0.0
2016 Q2
1,174
1
0
851.8
2016 Q1
855
1
1
1169.6
2015 Q4
1,027
0
0
0.0
2015 Q3
1,333
0
0
0.0
2015 Q2
1,224
4
0
3268.0
2015 Q1
1,071
6
0
5602.2
2014 Q4
1,608
0
0
0.0
2014 Q3
1,588
0
0
0.0
2014 Q2
1,548
4
1
2584.0
2014 Q1
1,518
2
1
1317.5
2013 Q4
1,779
0
0
0.0
2013 Q3
1,540
0
0
0.0
2013 Q2
1,423
0
0
0.0
2013 Q1
1,218
0
0
0.0
2012 Q4
1,666
0
0
0.0
2012 Q3
1,644
0
0
0.0
2012 Q2
260
2
0
7692.3
No fatalities recorded at this mine.
Reportable incidents
1 on file
2013 · 1 incident
June 25, 2013IL · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorPOWERED HAULAGE
Ran over rock size of basketball with loader, had loosened seat belt 2" - 3" due to heat. bounced around in cab of loader, continued to work until 7/3/2013.