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: 543 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
PC10 has $6K 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.
$6K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
36 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-02-26.
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: 2021-12-15, 4 years ago
0%
of limit-tested samples over the exposure limit
19
samples
10
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz10
Respirable dust, <.1mg8
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (19)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2021-12-15
Respirable dust, <.1mg
0
Utility Man
2021-12-15
Respirable dust, <.1mg
0
Cleanup Man
2021-12-15
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-10-29
Respirable dust, <.1mg
0
Utility Man
2020-10-29
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-09-07
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-09-07
Respirable dust, <.1mg
0
Front-end Loader Operator
2013-09-24
Quartz, respirable, >1% Qtz
0.25
0.63
0.40
Supervisor, Co. Official
2013-09-24
Quartz, respirable, >1% Qtz
0.13
0.64
0.20
Cleanup Man
2013-09-24
Respirable dust, <.1mg
0
Truck Driver
2013-09-24
Quartz, respirable, >1% Qtz
0.15
0.55
0.27
Front-end Loader Operator
2012-08-23
Quartz, respirable, >1% Qtz
0.21
1.07
0.20
Front-end Loader Operator
2012-08-23
Quartz, respirable, >1% Qtz
0.2
0.53
0.38
Front-end Loader Operator
2012-08-23
Quartz, respirable, >1% Qtz
0.21
0.69
0.30
Supervisor, Co. Official
2007-05-02
Unlisted Particulate, respirable, <1% Qtz
0.22
Dragline Operator
2007-05-02
Quartz, respirable, >1% Qtz
0.44
2.72
0.16
Cleanup Man
2006-06-13
Quartz, respirable, >1% Qtz
0.34
2.64
0.13
Front-end Loader Operator
2006-06-13
Quartz, respirable, >1% Qtz
0.5
1.46
0.34
Laborer, Bullgang
2006-06-13
Quartz, respirable, >1% Qtz
0.75
1.18
0.64
Dry Screen Plant 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
4
2024
5
2023
5
2022
5
2021
5
2020
6
2019
6
2018
5
2017
5
2016
6
2015
6
2014
6
2013
6
2012
3
2011
2
2010
1
2009
2
2008
6
2007
5
2006
4
Source: MSHA quarterly employment and production, updated weekly.
PC10 sits in Waukesha County, Wisconsin, where the Census mining category is 0.1% 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.
Waukesha County, Wisconsin · Population 409,040
0.1%
Mining share of county employment
$104,100
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
2,225
0
0
0.0
2026 Q1
1,886
1
0
530.2
2025 Q4
1,805
0
0
0.0
2025 Q3
2,170
0
0
0.0
2025 Q2
2,157
1
1
463.6
2025 Q1
1,442
1
0
693.5
2024 Q4
2,299
0
0
0.0
2024 Q3
2,646
6
0
2267.6
Show 72 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
2,529
0
0
0.0
2024 Q1
2,313
4
0
1729.4
2023 Q4
1,445
0
0
0.0
2023 Q3
2,035
0
0
0.0
2023 Q2
2,863
1
0
349.3
2023 Q1
3,261
0
0
0.0
2022 Q4
858
0
0
0.0
2022 Q3
2,757
0
0
0.0
2022 Q2
2,747
0
0
0.0
2022 Q1
2,338
0
0
0.0
2021 Q4
1,734
2
1
1153.4
2021 Q3
2,571
0
0
0.0
2021 Q2
3,312
0
0
0.0
2021 Q1
1,704
1
0
586.9
2020 Q4
1,948
0
0
0.0
2020 Q3
3,309
0
0
0.0
2020 Q2
3,062
0
0
0.0
2020 Q1
2,034
0
0
0.0
2019 Q4
2,147
0
0
0.0
2019 Q3
3,471
0
0
0.0
2019 Q2
3,332
0
0
0.0
2019 Q1
1,301
0
0
0.0
2018 Q4
3,116
0
0
0.0
2018 Q3
3,766
0
0
0.0
2018 Q2
1,514
0
0
0.0
2018 Q1
325
0
0
0.0
2017 Q4
1,738
3
0
1726.1
2017 Q3
3,153
1
0
317.2
2017 Q2
2,972
0
0
0.0
2017 Q1
1,537
0
0
0.0
2016 Q4
3,376
2
1
592.4
2016 Q3
3,213
1
0
311.2
2016 Q2
3,179
0
0
0.0
2016 Q1
864
0
0
0.0
2015 Q4
2,783
0
0
0.0
2015 Q3
3,362
0
0
0.0
2015 Q2
2,907
3
0
1032.0
2015 Q1
1,487
0
0
0.0
2014 Q4
2,477
0
0
0.0
2014 Q3
3,030
0
0
0.0
2014 Q2
3,261
0
0
0.0
2014 Q1
1,269
0
0
0.0
2013 Q4
2,484
0
0
0.0
2013 Q3
3,103
1
0
322.3
2013 Q2
3,228
0
0
0.0
2013 Q1
1,527
0
0
0.0
2012 Q4
2,852
1
0
350.6
2012 Q3
1,642
2
0
1218.0
2012 Q2
103
0
0
0.0
2012 Q1
67
0
0
0.0
2011 Q4
41
0
0
0.0
2011 Q3
184
0
0
0.0
2011 Q2
499
1
0
2004.0
2010 Q3
306
0
0
0.0
2010 Q2
291
0
0
0.0
2010 Q1
306
0
0
0.0
2009 Q4
176
0
0
0.0
2009 Q3
309
0
0
0.0
2009 Q2
483
0
0
0.0
2009 Q1
204
0
0
0.0
2008 Q4
2,930
0
0
0.0
2008 Q3
2,658
0
0
0.0
2008 Q2
2,890
0
0
0.0
2008 Q1
1,142
0
0
0.0
2007 Q4
2,804
0
0
0.0
2007 Q3
2,455
0
0
0.0
2007 Q2
2,962
1
0
337.6
2007 Q1
703
0
0
0.0
2006 Q4
3,066
0
0
0.0
2006 Q3
3,254
0
0
0.0
2006 Q2
2,991
1
0
334.3
2006 Q1
0
0
0
No fatalities recorded at this mine.
Reportable incidents
6 on file
2024 · 1 incident
November 27, 2024WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDTOOLS (NONPOWERED)
Employee inside Screen deck removing frozen agg. material from belt with pry bar. Chunk came free & struck the employee in the jaw, chipping a tooth. We were informed on 12/3/24 that the employee had dental work done. Reporting within 10 days.
2015 · 1 incident
January 27, 2015WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerDISORDERS (REPEATED TRAUMA)
Employee is claiming carpal tunnel syndrome in right wrist due to years of doing maintenance work & operating a large loader. Employee is having surgery.
2014 · 2 incidents
November 7, 2014WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
An employee and a co-worker were performing maintenance on a generator and were taking off the electrical panel. During this process the panel slipped and the employee cut his palm on a tab located on the backside of the panel. He sought medical treatment and received stitches.
February 19, 2014WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
Employee was doing general repair/maintenance & welding. Sometime in the morning his eye became irritated. He sought treatment on 2/20/14 & a foreign body was removed from his eye. He was given antibiotic ointment.
2008 · 1 incident
April 28, 2008WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerMACHINERY