Portable #100: 63 MSHA citations Metal/Non-Metal
Portable #100 has $12K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2009
63
citations
12
significant & substantial
$12,355
proposed penalties
$12,355
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2009
44
inspections on record
520
inspection hours
n/a
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: 520 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 #100 has $12K 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.$12K
proposed penalties
$12K
current assessed
$12K
paid to date
$0
outstanding
62 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-08-18.
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.19.4%
significant & substantial
8.1%
high negligence or reckless
19.4%
reasonably likely or greater
64.5%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 8.1% low, 83.9% moderate, 8.1% high, 0.0% reckless.
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: 2025-02-26
ⓘ
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.0%
of limit-tested samples over the exposure limit
16
samples
3
limit-tested
Most sampled contaminants
- Respirable dust, <.1mg10
- Quartz, respirable, >1% Qtz4
- Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (16)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2025-02-26 | Respirable dust, <.1mg | 0 | Bulldozer Operator | ||
| 2025-02-26 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2025-02-26 | Respirable dust, <.1mg | 0 | Complete Load-Haul-Dump | ||
| 2023-09-26 | Quartz, respirable, >1% Qtz | 0.19 | 0.6 | 0.32 | Crusher Oper/Worker |
| 2023-09-26 | Respirable dust, <.1mg | 0 | Rotary Bucket Ex. Operator | ||
| 2023-09-26 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2020-02-20 | Respirable dust, <.1mg | 0 | Bulldozer Operator | ||
| 2020-02-20 | Respirable dust, <.1mg | 0 | Bobcat Operator | ||
| 2020-02-20 | Quartz, respirable, >1% Qtz | 0.14 | Front-end Loader Operator | ||
| 2017-11-30 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2017-11-30 | Quartz, respirable, >1% Qtz | 0.53 | 0.71 | 0.75 | Crusher Oper/Worker |
| 2013-09-24 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2013-09-24 | Unlisted Particulate, respirable, <1% Qtz | 0.2 | Cleanup Man | ||
| 2013-09-24 | Unlisted Particulate, respirable, <1% Qtz | 0.12 | Backhoe Operator | ||
| 2012-07-24 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2012-07-24 | Quartz, respirable, >1% Qtz | 0.38 | 0.46 | 0.83 | 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.
Ownership history
- Western Construction Inc. 2009 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 6 |
| 2025 | 7 |
| 2024 | 7 |
| 2023 | 6 |
| 2022 | 5 |
| 2021 | 6 |
| 2020 | 5 |
| 2019 | 5 |
| 2018 | 5 |
| 2017 | 5 |
| 2016 | 4 |
| 2015 | 4 |
| 2014 | 3 |
| 2013 | 4 |
| 2012 | 4 |
| 2011 | 5 |
| 2010 | 2 |
| 2009 | 3 |
Source: MSHA quarterly employment and production, updated weekly.
Portable #100 sits in Pennington County, South Dakota, where the Census mining category is 0.9% 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.Pennington County, South Dakota · Population 112,081
0.9%
Mining share of county employment
$70,768
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 | 2,689 | 0 | 0 | 0.0 |
| 2026 Q1 | 5,453 | 0 | 0 | 0.0 |
| 2025 Q4 | 4,782 | 0 | 0 | 0.0 |
| 2025 Q3 | 5,351 | 2 | 0 | 373.8 |
| 2025 Q2 | 3,444 | 0 | 0 | 0.0 |
| 2025 Q1 | 3,419 | 5 | 0 | 1462.4 |
| 2024 Q4 | 3,979 | 0 | 0 | 0.0 |
| 2024 Q3 | 4,772 | 3 | 0 | 628.7 |
Show 61 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 4,390 | 0 | 0 | 0.0 |
| 2024 Q1 | 4,017 | 0 | 0 | 0.0 |
| 2023 Q4 | 4,938 | 0 | 0 | 0.0 |
| 2023 Q3 | 4,981 | 3 | 0 | 602.3 |
| 2023 Q2 | 3,031 | 0 | 0 | 0.0 |
| 2023 Q1 | 2,677 | 2 | 1 | 747.1 |
| 2022 Q4 | 2,917 | 0 | 0 | 0.0 |
| 2022 Q3 | 3,190 | 0 | 0 | 0.0 |
| 2022 Q2 | 2,679 | 2 | 1 | 746.5 |
| 2022 Q1 | 3,498 | 0 | 0 | 0.0 |
| 2021 Q4 | 3,896 | 3 | 0 | 770.0 |
| 2021 Q3 | 4,266 | 0 | 0 | 0.0 |
| 2021 Q2 | 3,584 | 0 | 0 | 0.0 |
| 2021 Q1 | 3,214 | 2 | 0 | 622.3 |
| 2020 Q4 | 3,618 | 0 | 0 | 0.0 |
| 2020 Q3 | 3,611 | 0 | 0 | 0.0 |
| 2020 Q2 | 3,736 | 1 | 0 | 267.7 |
| 2020 Q1 | 4,147 | 1 | 0 | 241.1 |
| 2019 Q4 | 3,476 | 0 | 0 | 0.0 |
| 2019 Q3 | 3,756 | 0 | 0 | 0.0 |
| 2019 Q2 | 2,744 | 1 | 0 | 364.4 |
| 2019 Q1 | 2,178 | 0 | 0 | 0.0 |
| 2018 Q4 | 2,239 | 0 | 0 | 0.0 |
| 2018 Q3 | 889 | 0 | 0 | 0.0 |
| 2018 Q2 | 2,023 | 0 | 0 | 0.0 |
| 2018 Q1 | 1,901 | 0 | 0 | 0.0 |
| 2017 Q4 | 3,177 | 1 | 0 | 314.8 |
| 2017 Q3 | 1,307 | 0 | 0 | 0.0 |
| 2017 Q2 | 2,654 | 1 | 0 | 376.8 |
| 2017 Q1 | 2,168 | 2 | 0 | 922.5 |
| 2016 Q4 | 2,313 | 0 | 0 | 0.0 |
| 2016 Q3 | 2,316 | 0 | 0 | 0.0 |
| 2016 Q2 | 1,388 | 0 | 0 | 0.0 |
| 2016 Q1 | 1,375 | 2 | 1 | 1454.5 |
| 2015 Q4 | 796 | 0 | 0 | 0.0 |
| 2015 Q3 | 1,062 | 0 | 0 | 0.0 |
| 2015 Q2 | 1,827 | 2 | 0 | 1094.7 |
| 2015 Q1 | 2,013 | 0 | 0 | 0.0 |
| 2014 Q4 | 3,018 | 0 | 0 | 0.0 |
| 2014 Q3 | 1,866 | 1 | 0 | 535.9 |
| 2014 Q2 | 2,838 | 0 | 0 | 0.0 |
| 2014 Q1 | 0 | 0 | 0 | |
| 2013 Q4 | 1,020 | 0 | 0 | 0.0 |
| 2013 Q3 | 1,450 | 1 | 0 | 689.7 |
| 2013 Q2 | 1,529 | 1 | 1 | 654.0 |
| 2013 Q1 | 1,911 | 0 | 0 | 0.0 |
| 2012 Q4 | 863 | 0 | 0 | 0.0 |
| 2012 Q3 | 1,633 | 1 | 0 | 612.4 |
| 2012 Q2 | 2,665 | 0 | 0 | 0.0 |
| 2012 Q1 | 1,263 | 4 | 1 | 3167.1 |
| 2011 Q4 | 948 | 0 | 0 | 0.0 |
| 2011 Q3 | 3,542 | 0 | 0 | 0.0 |
| 2011 Q2 | 1,244 | 0 | 0 | 0.0 |
| 2011 Q1 | 2,331 | 2 | 0 | 858.0 |
| 2010 Q4 | 1,730 | 0 | 0 | 0.0 |
| 2010 Q3 | 1,520 | 0 | 0 | 0.0 |
| 2010 Q2 | 1,006 | 3 | 1 | 2982.1 |
| 2010 Q1 | 700 | 0 | 0 | 0.0 |
| 2009 Q4 | 952 | 0 | 0 | 0.0 |
| 2009 Q3 | 2,240 | 8 | 1 | 3571.4 |
| 2009 Q2 | 235 | 0 | 0 | 0.0 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.