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: 401 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Portable #1 has $5K 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.
$5K
proposed penalties
$5K
current assessed
$5K
paid to date
$0
outstanding
32 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-03-11.
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: 2026-03-11
0%
of limit-tested samples over the exposure limit
8
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg5
Nuisance dust, respirable, <1% Qtz1
Quartz, respirable, >1% Qtz1
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (8)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-03-11
Respirable dust, <.1mg
0
Front-end Loader Operator
2026-03-11
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-06-17
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-06-17
Quartz, respirable, >1% Qtz
0.19
Cleanup Man
2019-10-16
Respirable dust, <.1mg
0
Front-end Loader Operator
2019-10-16
Respirable dust, <.1mg
0
Front-end Loader Operator
2019-10-16
Unlisted Particulate, respirable, <1% Qtz
0.15
Dry Screen Plant Operator
2011-08-03
Nuisance dust, respirable, <1% Qtz
0.5
10
0.05
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
5
2025
5
2024
4
2023
4
2022
4
2021
4
2020
3
2019
2
2018
2
2017
3
2016
3
2015
1
2014
1
2013
1
2012
1
2011
1
2010
2
2009
1
2008
2
2007
1
2006
1
2005
1
2004
1
2003
1
2002
1
2001
1
2000
1
Source: MSHA quarterly employment and production, updated weekly.
Portable #1 sits in Milwaukee County, Wisconsin, where the Census mining category is 0.0% 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.
Milwaukee County, Wisconsin · Population 927,656
0.0%
Mining share of county employment
$62,118
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
1,577
0
0
0.0
2026 Q1
2,051
1
0
487.6
2025 Q4
1,661
0
0
0.0
2025 Q3
1,390
0
0
0.0
2025 Q2
1,568
0
0
0.0
2025 Q1
1,293
0
0
0.0
2024 Q4
1,721
1
0
581.1
2024 Q3
1,258
8
0
6359.3
Show 97 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q1
871
0
0
0.0
2023 Q4
417
1
1
2398.1
2023 Q3
1,329
2
0
1504.9
2023 Q2
1,612
0
0
0.0
2023 Q1
1,686
0
0
0.0
2022 Q4
1,932
1
0
517.6
2022 Q3
2,265
0
0
0.0
2022 Q2
1,931
0
0
0.0
2022 Q1
1,650
2
0
1212.1
2021 Q4
1,917
0
0
0.0
2021 Q3
1,942
0
0
0.0
2021 Q2
2,211
1
0
452.3
2021 Q1
1,184
0
0
0.0
2020 Q4
2,209
0
0
0.0
2020 Q3
1,693
0
0
0.0
2020 Q2
966
0
0
0.0
2020 Q1
650
0
0
0.0
2019 Q4
866
0
0
0.0
2019 Q3
855
2
0
2339.2
2019 Q2
937
0
0
0.0
2019 Q1
727
0
0
0.0
2018 Q4
890
0
0
0.0
2018 Q3
928
0
0
0.0
2018 Q2
917
2
0
2181.0
2018 Q1
788
0
0
0.0
2017 Q4
1,015
1
1
985.2
2017 Q3
1,037
0
0
0.0
2017 Q2
1,036
0
0
0.0
2017 Q1
888
2
1
2252.3
2016 Q4
1,002
0
0
0.0
2016 Q3
1,118
0
0
0.0
2016 Q2
988
0
0
0.0
2016 Q1
489
0
0
0.0
2015 Q4
799
1
0
1251.6
2015 Q3
819
0
0
0.0
2015 Q2
763
0
0
0.0
2015 Q1
461
0
0
0.0
2014 Q4
726
0
0
0.0
2014 Q3
828
0
0
0.0
2014 Q2
831
0
0
0.0
2014 Q1
406
0
0
0.0
2013 Q4
675
0
0
0.0
2013 Q3
745
0
0
0.0
2013 Q2
749
0
0
0.0
2013 Q1
209
0
0
0.0
2012 Q4
663
0
0
0.0
2012 Q3
556
0
0
0.0
2012 Q2
801
0
0
0.0
2012 Q1
0
1
0
2011 Q4
384
0
0
0.0
2011 Q3
733
4
0
5457.0
2011 Q2
926
0
0
0.0
2011 Q1
621
0
0
0.0
2010 Q4
693
0
0
0.0
2010 Q3
721
0
0
0.0
2010 Q2
598
0
0
0.0
2010 Q1
283
0
0
0.0
2009 Q4
589
1
0
1697.8
2009 Q3
744
0
0
0.0
2009 Q2
685
0
0
0.0
2009 Q1
0
0
0
2008 Q4
1,051
0
0
0.0
2008 Q3
1,465
0
0
0.0
2008 Q2
1,161
0
0
0.0
2008 Q1
630
0
0
0.0
2007 Q4
730
0
0
0.0
2007 Q3
802
0
0
0.0
2007 Q2
1,100
0
0
0.0
2007 Q1
763
0
0
0.0
2006 Q4
761
0
0
0.0
2006 Q3
907
0
0
0.0
2006 Q2
753
0
0
0.0
2006 Q1
728
0
0
0.0
2005 Q4
529
0
0
0.0
2005 Q3
744
0
0
0.0
2005 Q2
792
0
0
0.0
2005 Q1
793
0
0
0.0
2004 Q4
726
0
0
0.0
2004 Q3
822
0
0
0.0
2004 Q2
789
0
0
0.0
2004 Q1
516
0
0
0.0
2003 Q4
696
0
0
0.0
2003 Q3
811
0
0
0.0
2003 Q2
784
0
0
0.0
2003 Q1
303
0
0
0.0
2002 Q4
697
0
0
0.0
2002 Q3
818
0
0
0.0
2002 Q2
733
0
0
0.0
2002 Q1
502
0
0
0.0
2001 Q4
759
0
0
0.0
2001 Q3
821
0
0
0.0
2001 Q2
723
1
0
1383.1
2001 Q1
544
0
0
0.0
2000 Q4
665
0
0
0.0
2000 Q3
792
0
0
0.0
2000 Q2
649
0
0
0.0
2000 Q1
516
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
2 on file
2024 · 1 incident
February 21, 2024WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerSLIP OR FALL OF PERSON
Miner slipped and fell backwards while pulling cord to dismantle conveyor for maintenance, resulting in a sprained/strained lower back. Supervisor took Miner directly to urgent care. Miner will need Doctor's release to return to work.
2004 · 1 incident
September 10, 2004WI · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanDISORDERS (REPEATED TRAUMA)