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PORTABLE CRUSHER #1: 81 MSHA citations Metal/Non-Metal

Mobridge, Walworth County, SD  ·  Intermittent
MSHA Mine ID: 3900456

PORTABLE CRUSHER #1 has $10K in proposed MSHA penalties and $0 outstanding across 7 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
1
Years on record
2015
Latest incident
Jun 2015
Compliance record
MSHA citations since 2001
81
citations
13
significant & substantial
$10,205
proposed penalties
$10,032
paid to date
98% of proposed penalties paid to date, a $173 gap.
Source: MSHA violations data, updated weekly.
See Jensen Rock & Sand Inc's full MSHA compliance history →
Inspection activity
MSHA inspections since 2001
49
inspections on record
660
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: 660 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 CRUSHER #1 has $10K in proposed MSHA penalties and $0 outstanding across 7 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.
$10K
proposed penalties
$10K
current assessed
$10K
paid to date
$0
outstanding
78 assessments are final orders; 7 contested dockets.
Of $2K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2026-06-25.
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.
16.0%
significant & substantial
4.9%
high negligence or reckless
16.0%
reasonably likely or greater
53.1%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 17.3% low, 77.8% moderate, 4.9% high, 0.0% reckless.
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.
13 citations taken to the federal commission · 16% of citations on record
  • Settled 13 · 100%
80%
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 5 decided S&S contests · industry: 79%
11%
Penalty reduction in decided contests
$2K proposed, $1K 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 2018-08-21.
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.
Docket Decision Judge Year Proposed / upheld
CENT 2016-0111 Settlement Miller 2016 $843 → $700
CENT 2004-228M Dismissal Lesnick 2004 $360 → $360
CENT 2018-0106 Settlement Simonton 2018 $252 → $232
CENT 2018-0193 Settlement Simonton 2018 $128 → $118
CENT 2018-63M Settlement McCarthy 2018 $116 → $116
CENT 2016-0391 Settlement Paez 2016 $100 → $100
Source: FMSHRC civil penalty dockets and decisions (public record), 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: 2024-10-16
17%
of limit-tested samples over the exposure limit
18
samples
6
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz71 over
  • Respirable dust, <.1mg10
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (18)
Date Contaminant Concentration Limit Conc / limit Occupation
2017-11-01 Quartz, respirable, >1% Qtz 1.03 0.57 1.81 Crusher Oper/Worker
2024-10-16 Respirable dust, <.1mg 0 Bulldozer Operator
2024-10-16 Unlisted Particulate, respirable, <1% Qtz 0.17 Front-end Loader Operator
2024-10-16 Quartz, respirable, >1% Qtz 0.14 Crusher Oper/Worker
2020-09-23 Respirable dust, <.1mg 0 Front-end Loader Operator
2020-09-23 Respirable dust, <.1mg 0 Crusher Oper/Worker
2020-09-23 Respirable dust, <.1mg 0 Bulldozer Operator
2017-12-19 Respirable dust, <.1mg 0 Front-end Loader Operator
2017-12-19 Quartz, respirable, >1% Qtz 0.14 0.79 0.18 Crusher Oper/Worker
2017-11-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2017-11-01 Quartz, respirable, >1% Qtz 0.51 0.99 0.52 Front-end Loader Operator
2013-09-24 Quartz, respirable, >1% Qtz 0.34 0.95 0.36 Crusher Oper/Worker
2013-09-24 Respirable dust, <.1mg 0 Front-end Loader Operator
2004-11-30 Respirable dust, <.1mg 0 Laborer, Bullgang
2004-11-30 Quartz, respirable, >1% Qtz 0.18 1.09 0.17 Crusher Oper/Worker
2002-10-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2002-10-01 Quartz, respirable, >1% Qtz 0.19 0.82 0.23 Bulldozer Operator
2002-10-01 Respirable dust, <.1mg 0 Crusher Oper/Worker

Area samples (mill and shop air)

Last sampled: 2016-09-29, 9 years ago
1
samples
Show the individual readings (1)
Date Contaminant Concentration Limit Conc / limit Area sampled
2016-09-29 Respirable dust, <.1mg 0 SF ACTIVE MINING
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
  1. Jensen Rock & Sand Inc 1950 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 2
2025 3
2024 28
2023 2
2022 3
2021 3
2020 2
2019 3
2018 2
2017 3
2016 3
2015 3
2014 2
2013 3
2012 4
2011 2
2010 2
2009 2
2008 2
2007 4
2006 2
2005 4
2004 4
2003 4
2002 1
2001 1
Source: MSHA quarterly employment and production, updated weekly.

PORTABLE CRUSHER #1 sits in Walworth County, South Dakota, 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.
Walworth County, South Dakota · Population 5,298
0.0%
Mining share of county employment
$62,722
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 1,800 3 0 1666.7
2026 Q1 0 0 0
2025 Q4 1,358 0 0 0.0
2025 Q3 1,842 0 0 0.0
2025 Q2 847 0 0 0.0
2025 Q1 0 0 0
2024 Q4 1,599 3 0 1876.2
2024 Q3 1,318 0 0 0.0
Show 92 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 1,039 3 1 2887.4
2024 Q1 0 0 0
2023 Q4 1,047 0 0 0.0
2023 Q3 1,444 1 0 692.5
2023 Q2 559 0 0 0.0
2023 Q1 0 0 0
2022 Q4 635 0 0 0.0
2022 Q3 1,449 0 0 0.0
2022 Q2 1,531 0 0 0.0
2022 Q1 571 0 0 0.0
2021 Q4 1,030 0 0 0.0
2021 Q3 1,648 1 0 606.8
2021 Q2 568 0 0 0.0
2021 Q1 514 0 0 0.0
2020 Q4 1,342 0 0 0.0
2020 Q3 1,209 0 0 0.0
2020 Q2 876 0 0 0.0
2020 Q1 0 0 0
2019 Q4 986 2 0 2028.4
2019 Q3 918 0 0 0.0
2019 Q2 735 0 0 0.0
2019 Q1 0 0 0
2018 Q4 1,405 3 1 2135.2
2018 Q3 1,500 0 0 0.0
2018 Q2 461 0 0 0.0
2018 Q1 0 0 0
2017 Q4 995 6 3 6030.2
2017 Q3 598 10 1 16722.4
2017 Q2 352 0 0 0.0
2017 Q1 0 0 0
2016 Q4 441 0 0 0.0
2016 Q3 1,086 0 0 0.0
2016 Q2 551 0 0 0.0
2016 Q1 563 1 0 1776.2
2015 Q4 1,141 0 0 0.0
2015 Q3 917 8 0 8724.1
2015 Q2 555 0 0 0.0
2015 Q1 266 0 0 0.0
2014 Q4 526 0 0 0.0
2014 Q3 268 1 0 3731.3
2014 Q2 443 0 0 0.0
2014 Q1 0 0 0
2013 Q4 548 0 0 0.0
2013 Q3 1,060 3 0 2830.2
2013 Q2 767 0 0 0.0
2013 Q1 276 0 0 0.0
2012 Q4 976 0 0 0.0
2012 Q3 1,857 0 0 0.0
2012 Q2 2,050 0 0 0.0
2012 Q1 408 6 2 14705.9
2011 Q4 1,399 0 0 0.0
2011 Q3 468 0 0 0.0
2011 Q2 856 7 2 8177.6
2011 Q1 0 0 0
2010 Q4 181 0 0 0.0
2010 Q3 1,846 0 0 0.0
2010 Q2 1,395 0 0 0.0
2010 Q1 0 1 0
2009 Q4 993 0 0 0.0
2009 Q3 1,841 0 0 0.0
2009 Q2 561 0 0 0.0
2009 Q1 0 0 0
2008 Q4 0 0 0
2008 Q3 368 0 0 0.0
2008 Q2 1,458 1 0 685.9
2008 Q1 575 0 0 0.0
2007 Q4 535 0 0 0.0
2007 Q3 1,921 1 0 520.6
2007 Q2 2,268 0 0 0.0
2007 Q1 362 0 0 0.0
2006 Q4 0 0 0
2006 Q3 1,482 0 0 0.0
2006 Q2 1,670 0 0 0.0
2006 Q1 413 0 0 0.0
2005 Q4 1,495 0 0 0.0
2005 Q3 2,795 0 0 0.0
2005 Q2 1,482 0 0 0.0
2005 Q1 714 0 0 0.0
2004 Q4 1,741 3 0 1723.1
2004 Q3 2,848 7 1 2457.9
2004 Q2 2,765 0 0 0.0
2004 Q1 1,170 0 0 0.0
2003 Q4 2,114 0 0 0.0
2003 Q3 1,830 0 0 0.0
2003 Q2 1,760 0 0 0.0
2003 Q1 0 0 0
2002 Q4 117 0 0 0.0
2002 Q3 830 0 0 0.0
2002 Q2 0 0 0
2002 Q1 0 0 0
2001 Q4 117 0 0 0.0
2001 Q3 117 10 2 85470.1
No fatalities recorded at this mine.

Reportable incidents

1 on file

2015 · 1 incident

June 10, 2015 SD · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Jensen Rock & Sand Inc · Caught in, under or between (Not Elsewhere Classified)

Employee was stepping down from Dozer. It had just rained and his foot slipped in between tracks got caught and when he fell he broke his lower leg.