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Potosi Plant #(CS66): 21 MSHA citations Metal/Non-Metal

Controlled by Riverstone Group
Potosi, Washington County, MO  ·  Active
MSHA Mine ID: 2302423

Potosi Plant #(CS66) has $3K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
1
Years on record
2022
Latest incident
Sep 2022
Compliance record
MSHA citations since 2011
21
citations
3
significant & substantial
$3,052
proposed penalties
$2,901
paid to date
95% of proposed penalties paid to date, a $151 gap.
Source: MSHA violations data, updated weekly.
See Central Stone Company's full MSHA compliance history →
Inspection activity
MSHA inspections since 2011
28
inspections on record
378
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: 378 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Potosi Plant #(CS66) has $3K 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.
$3K
proposed penalties
$3K
current assessed
$3K
paid to date
$0
outstanding
19 assessments are final orders; 1 contested dockets.
Of $302 in penalties contested before the Commission, $151 was upheld in final decisions.
As of the most recent assessment on 2026-06-24.
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.
14.3%
significant & substantial
0.0%
high negligence or reckless
14.3%
reasonably likely or greater
71.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 23.8% low, 76.2% moderate, 0.0% 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.
2 citations taken to the federal commission · 10% of citations on record
  • Settled 1 · 50%
  • Vacated or withdrawn 1 · 50%
50%
Penalty reduction in decided contests
$302 proposed, $151 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 2025-12-16.
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 2026-0039 Settlement Paez 2026 $302 → $151
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: 2026-01-06
10%
of limit-tested samples over the exposure limit
22
samples
10
limit-tested
Most sampled contaminants
  • Nuisance dust, total, <1% Qtz101 over
  • Respirable dust, <.1mg12
Show the individual readings (22)
Date Contaminant Concentration Limit Conc / limit Occupation
2025-10-15 Nuisance dust, total, <1% Qtz 11.4 10 1.14 Laborer, Bullgang
2026-01-06 Respirable dust, <.1mg 0 Truck Driver
2026-01-06 Nuisance dust, total, <1% Qtz 3.82 10 0.38 Laborer, Bullgang
2026-01-06 Nuisance dust, total, <1% Qtz 1.86 10 0.19 Cleanup Man
2026-01-06 Respirable dust, <.1mg 0 Truck Driver
2026-01-06 Respirable dust, <.1mg 0 Rotary Bucket Ex. Operator
2026-01-06 Respirable dust, <.1mg 0 Bulldozer Operator
2025-10-15 Nuisance dust, total, <1% Qtz 0.49 10 0.05 Lab Technician
2025-10-15 Nuisance dust, total, <1% Qtz 1.85 10 0.19 Drill Operator, Rotary
2025-10-15 Nuisance dust, total, <1% Qtz 0.18 10 0.02 Front-end Loader Operator
2025-10-15 Nuisance dust, total, <1% Qtz 0 10 0.00 Front-end Loader Operator
2025-10-15 Nuisance dust, total, <1% Qtz 0.35 10 0.04 Scale Man
2025-10-15 Nuisance dust, total, <1% Qtz 4.97 10 0.50 Cleanup Man
2025-10-15 Nuisance dust, total, <1% Qtz 5.62 10 0.56 Crusher Oper/Worker
2024-12-12 Respirable dust, <.1mg 0 Laborer, Bullgang
2024-12-12 Respirable dust, <.1mg 0 Front-end Loader Operator
2024-04-16 Respirable dust, <.1mg 0 Front-end Loader Operator
2024-04-16 Respirable dust, <.1mg 0 Laborer, Bullgang
2023-08-08 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-08-08 Respirable dust, <.1mg 0 Building Repair/Maint.
2012-03-13 Respirable dust, <.1mg 0 Front-end Loader Operator
2012-03-13 Respirable dust, <.1mg 0 Front-end Loader Operator

Area samples (mill and shop air)

Last sampled: 2025-10-08
1
samples
Show the individual readings (2)
Date Contaminant Concentration Limit Conc / limit Area sampled
2025-10-08 ANALYZED BULK DUST MASS 0 SF ACTIVE MINING
2025-10-08 QUARTZ (BULK DUST) 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. Central Stone Company 2011 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 9
2025 9
2024 11
2023 6
2022 8
2021 7
2020 7
2019 7
2018 7
2017 6
2016 4
2015 4
2014 4
2013 4
2012 4
2011 4
Source: MSHA quarterly employment and production, updated weekly.

Potosi Plant #(CS66) sits in Washington County, Missouri, where the Census mining category is 1.6% 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.
Washington County, Missouri · Population 23,483
1.6%
Mining share of county employment
$51,886
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 5,717 1 0 174.9
2026 Q1 5,446 0 0 0.0
2025 Q4 4,887 5 1 1023.1
2025 Q3 4,978 0 0 0.0
2025 Q2 5,246 1 0 190.6
2025 Q1 3,502 0 0 0.0
2024 Q4 4,005 2 0 499.4
2024 Q3 4,202 0 0 0.0
Show 51 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 5,077 0 0 0.0
2024 Q1 4,300 0 0 0.0
2023 Q4 3,628 0 0 0.0
2023 Q3 3,228 4 0 1239.2
2023 Q1 1,868 0 0 0.0
2022 Q4 3,053 0 0 0.0
2022 Q3 3,916 0 0 0.0
2022 Q2 3,602 0 0 0.0
2022 Q1 3,041 0 0 0.0
2021 Q4 3,237 0 0 0.0
2021 Q3 4,194 0 0 0.0
2021 Q2 2,688 0 0 0.0
2021 Q1 2,936 0 0 0.0
2020 Q4 2,837 0 0 0.0
2020 Q3 2,334 0 0 0.0
2020 Q2 2,573 0 0 0.0
2020 Q1 2,664 0 0 0.0
2019 Q4 2,786 0 0 0.0
2019 Q3 2,729 0 0 0.0
2019 Q2 3,846 0 0 0.0
2019 Q1 3,232 1 1 309.4
2018 Q4 2,858 0 0 0.0
2018 Q3 3,068 0 0 0.0
2018 Q2 3,888 0 0 0.0
2018 Q1 2,940 3 1 1020.4
2017 Q4 2,897 0 0 0.0
2017 Q3 3,712 0 0 0.0
2017 Q2 3,023 0 0 0.0
2017 Q1 1,337 0 0 0.0
2016 Q4 1,424 0 0 0.0
2016 Q3 1,341 0 0 0.0
2016 Q2 1,674 0 0 0.0
2016 Q1 1,525 1 0 655.7
2015 Q4 1,525 0 0 0.0
2015 Q3 1,358 0 0 0.0
2015 Q2 1,472 0 0 0.0
2015 Q1 1,809 0 0 0.0
2014 Q4 1,301 0 0 0.0
2014 Q3 1,412 0 0 0.0
2014 Q2 1,586 0 0 0.0
2014 Q1 462 0 0 0.0
2013 Q4 1,208 0 0 0.0
2013 Q3 1,339 0 0 0.0
2013 Q2 1,316 0 0 0.0
2013 Q1 1,216 0 0 0.0
2012 Q4 1,475 1 0 678.0
2012 Q3 1,771 0 0 0.0
2012 Q2 2,127 0 0 0.0
2012 Q1 1,821 0 0 0.0
2011 Q4 1,983 1 0 504.3
2011 Q3 744 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

1 on file

2022 · 1 incident

September 9, 2022 MO · Metal/Non-Metal dry screening plant operator, screen house operator HANDTOOLS (NONPOWERED)
Central Stone Company · Struck against stationary object

Employee alleges they were shoveling off a overloaded conveyor and right thumb hit a metal chute causing a sprain to the right thumb. They had to wear a splint for the thumb.