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: 419 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 $7K in proposed MSHA penalties and $0 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.
$7K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
52 assessments are final orders; 1 contested dockets.
Of $686 in penalties contested before the Commission, $442 was upheld in final decisions.
As of the most recent assessment on 2024-06-18.
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 · 8% of citations on record
Settled
2 · 50%
Stood as issued
2 · 50%
100%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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%
36%
Penalty reduction in decided contests
$686 proposed, $442 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2011-01-05.
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: 2025-08-26
4
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg4
Show the individual readings (4)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-08-26
Respirable dust, <.1mg
0
Crusher Oper/Worker
2019-08-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2019-08-20
Respirable dust, <.1mg
0
Crusher Oper/Worker
2009-09-29
Respirable dust, <.1mg
0
Crusher Oper/Worker
Area samples (mill and shop air)
Last sampled: 2014-11-05, 11 years ago
1
samples
Show the individual readings (1)
Date
Contaminant
Concentration
Limit
Conc / limit
Area sampled
2014-11-05
Respirable dust, <.1mg
0
SF GENERAL
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
2
2025
2
2024
2
2023
2
2022
1
2021
2
2020
3
2019
2
2018
2
2017
2
2016
2
2015
2
2014
2
2013
2
2012
2
2011
2
2010
1
2009
2
2008
2
2007
2
2006
2
2005
2
2004
2
2003
2
2002
1
Source: MSHA quarterly employment and production, updated weekly.
PORTABLE #1 sits in Custer County, South Dakota, where the Census mining category is 2.8% 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.
Custer County, South Dakota · Population 8,686
2.8%
Mining share of county employment
$81,958
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 Q1
310
0
0
0.0
2025 Q4
644
0
0
0.0
2025 Q3
874
0
0
0.0
2025 Q2
709
0
0
0.0
2025 Q1
510
0
0
0.0
2024 Q4
720
0
0
0.0
2024 Q3
764
0
0
0.0
2024 Q2
895
2
0
2234.6
Show 88 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q1
796
0
0
0.0
2023 Q4
857
0
0
0.0
2023 Q3
721
0
0
0.0
2023 Q2
669
0
0
0.0
2023 Q1
0
0
0
2022 Q4
356
0
0
0.0
2022 Q3
708
0
0
0.0
2022 Q2
521
0
0
0.0
2022 Q1
384
0
0
0.0
2021 Q4
766
0
0
0.0
2021 Q3
964
0
0
0.0
2021 Q2
837
1
0
1194.7
2021 Q1
482
2
1
4149.4
2020 Q4
1,234
0
0
0.0
2020 Q3
1,129
0
0
0.0
2020 Q2
971
1
0
1029.9
2020 Q1
912
0
0
0.0
2019 Q4
821
2
0
2436.1
2019 Q3
1,029
4
1
3887.3
2019 Q2
829
0
0
0.0
2019 Q1
377
1
0
2652.5
2018 Q4
830
0
0
0.0
2018 Q3
957
4
0
4179.7
2018 Q2
854
0
0
0.0
2018 Q1
774
0
0
0.0
2017 Q4
826
4
2
4842.6
2017 Q3
598
0
0
0.0
2017 Q2
691
0
0
0.0
2017 Q1
608
2
0
3289.5
2016 Q4
510
0
0
0.0
2016 Q3
413
0
0
0.0
2016 Q2
680
0
0
0.0
2016 Q1
502
0
0
0.0
2015 Q4
703
4
0
5689.9
2015 Q3
822
0
0
0.0
2015 Q2
661
0
0
0.0
2015 Q1
313
0
0
0.0
2014 Q4
586
0
0
0.0
2014 Q3
792
0
0
0.0
2014 Q2
485
0
0
0.0
2014 Q1
107
0
0
0.0
2013 Q4
388
3
0
7732.0
2013 Q3
826
0
0
0.0
2013 Q2
488
0
0
0.0
2013 Q1
652
1
0
1533.7
2012 Q4
540
0
0
0.0
2012 Q3
1,060
0
0
0.0
2012 Q2
917
0
0
0.0
2012 Q1
916
0
0
0.0
2011 Q4
930
2
0
2150.5
2011 Q3
894
0
0
0.0
2011 Q2
647
0
0
0.0
2011 Q1
37
0
0
0.0
2010 Q4
480
6
4
12500.0
2010 Q3
838
0
0
0.0
2010 Q2
0
0
0
2010 Q1
41
1
0
24390.2
2009 Q4
722
0
0
0.0
2009 Q3
1,139
1
1
878.0
2009 Q2
654
0
0
0.0
2009 Q1
857
0
0
0.0
2008 Q4
848
5
2
5896.2
2008 Q3
354
0
0
0.0
2008 Q2
719
0
0
0.0
2008 Q1
852
0
0
0.0
2007 Q4
881
1
0
1135.1
2007 Q3
500
0
0
0.0
2007 Q2
1,046
0
0
0.0
2007 Q1
89
0
0
0.0
2006 Q4
651
0
0
0.0
2006 Q3
1,081
0
0
0.0
2006 Q2
1,008
2
0
1984.1
2006 Q1
883
0
0
0.0
2005 Q4
776
0
0
0.0
2005 Q3
999
0
0
0.0
2005 Q2
597
0
0
0.0
2005 Q1
242
0
0
0.0
2004 Q4
893
2
2
2239.6
2004 Q3
1,038
0
0
0.0
2004 Q2
681
0
0
0.0
2004 Q1
1,131
1
0
884.2
2003 Q4
287
0
0
0.0
2003 Q3
435
0
0
0.0
2003 Q2
37
0
0
0.0
2003 Q1
29
0
0
0.0
2002 Q4
55
0
0
0.0
2002 Q3
0
0
0
2002 Q2
0
0
0
No fatalities recorded at this mine.
Reportable incidents
1 on file
2009 · 1 incident
March 2, 2009SD · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSLIP OR FALL OF PERSON
EE was walking across yard and slipped in the mud and sprained his ankle. We sent him to Urgent Care. They cleared him for work 3-3-09 with no restrictions.