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: 146 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Gerke Plant #6 has $1K in proposed MSHA penalties and $0 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.
$1K
proposed penalties
$1K
current assessed
$1K
paid to date
$0
outstanding
9 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-03-25.
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.
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: 2020-11-05, 5 years ago
0%
of limit-tested samples over the exposure limit
1
samples
1
limit-tested
Most sampled contaminants
Nuisance dust, respirable, <1% Qtz1
Show the individual readings (1)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2020-11-05
Nuisance dust, respirable, <1% Qtz
0.37
10
0.04
Cleanup Man
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
7
2025
4
2024
5
2023
4
2022
4
2021
4
2020
2
2019
3
2018
6
2017
4
2016
5
2015
4
2014
4
Source: MSHA quarterly employment and production, updated weekly.
Gerke Plant #6 sits in Monroe County, Wisconsin, where the Census mining category is 1.6% 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.
Monroe County, Wisconsin · Population 46,169
1.6%
Mining share of county employment
$68,213
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
1,068
0
0
0.0
2026 Q1
142
0
0
0.0
2025 Q4
989
0
0
0.0
2025 Q3
755
0
0
0.0
2025 Q2
1,938
0
0
0.0
2025 Q1
1,036
1
0
965.3
2024 Q4
1,827
0
0
0.0
2024 Q3
47
0
0
0.0
Show 41 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
277
0
0
0.0
2024 Q1
987
2
0
2026.3
2023 Q4
1,144
0
0
0.0
2023 Q3
208
0
0
0.0
2023 Q2
603
0
0
0.0
2023 Q1
694
0
0
0.0
2022 Q4
1,667
1
1
599.9
2022 Q3
331
0
0
0.0
2022 Q2
537
0
0
0.0
2022 Q1
665
0
0
0.0
2021 Q4
1,278
0
0
0.0
2021 Q3
738
0
0
0.0
2021 Q2
1,251
0
0
0.0
2021 Q1
1,240
0
0
0.0
2020 Q4
406
0
0
0.0
2020 Q3
0
0
0
2020 Q2
990
0
0
0.0
2020 Q1
0
0
0
2019 Q4
450
1
0
2222.2
2019 Q3
0
0
0
2019 Q2
745
1
0
1342.3
2019 Q1
1,339
0
0
0.0
2018 Q4
1,529
0
0
0.0
2018 Q3
2,137
0
0
0.0
2018 Q2
1,499
0
0
0.0
2018 Q1
703
0
0
0.0
2017 Q4
1,609
0
0
0.0
2017 Q3
945
0
0
0.0
2017 Q2
1,664
0
0
0.0
2017 Q1
335
0
0
0.0
2016 Q4
1,260
0
0
0.0
2016 Q3
582
0
0
0.0
2016 Q2
1,319
0
0
0.0
2016 Q1
396
0
0
0.0
2015 Q4
759
0
0
0.0
2015 Q3
1,270
0
0
0.0
2015 Q2
838
0
0
0.0
2015 Q1
1,005
0
0
0.0
2014 Q4
533
1
0
1876.2
2014 Q3
1,543
0
0
0.0
2014 Q2
381
2
0
5249.3
No fatalities recorded at this mine.
Reportable incidents
1 on file
2014 · 1 incident
May 7, 2014WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS