Polycor Oklahoma Inc. · Over-exertion in lifting objects
Employee stated they lifted a track extension and tweaked their lower back.
St Clair Quarry: 57 MSHA citations Metal/Non-Metal
Cooper Stone LLC
· Surface
Controlled by
Dustin Cooper
Marble City,
Sequoyah County,
OK
·
Intermittent
MSHA Mine ID: 3401813
St Clair Quarry has $18K in proposed MSHA penalties and $369 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 6
- Years on record
- 2013–2019
- Latest incident
- Apr 2019
Compliance record
MSHA citations since 2001
57
citations
14
significant & substantial
$18,041
proposed penalties
$17,672
paid to date
98% of proposed penalties paid to date, a $369 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2001
44
inspections on record
471
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: 471 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
St Clair Quarry has $18K in proposed MSHA penalties and $369 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.$18K
proposed penalties
$18K
current assessed
$18K
paid to date
$369
outstanding
57 assessments are final orders; 1 contested dockets.
Of $60 in penalties contested before the Commission, $60 was upheld in final decisions.
As of the most recent assessment on 2026-03-25.
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.24.6%
significant & substantial
22.8%
high negligence or reckless
24.6%
reasonably likely or greater
40.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 12.3% low, 64.9% moderate, 22.8% 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.
1
citations taken to the federal commission · 2% of citations on record
- Settled 1 · 100%
0%
Penalty reduction in decided contests
$60 proposed, $60 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 2006-10-31.
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 2007-36M | Settlement | Barbour | 2007 | $60 → $60 |
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: 2026-03-25
ⓘ
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
10
samples
6
limit-tested
Most sampled contaminants
- Nuisance dust, respirable, <1% Qtz3
- Nuisance dust, total, <1% Qtz3
- Respirable dust, <.1mg3
- Quartz, respirable, >1% Qtz1
Show the individual readings (10)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2026-03-25 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2026-03-25 | Respirable dust, <.1mg | 0 | Forklift Operator | ||
| 2022-04-27 | Quartz, respirable, >1% Qtz | 0.23 | Stone Polisher/Cutter | ||
| 2022-04-27 | Nuisance dust, respirable, <1% Qtz | 0.23 | 10 | 0.02 | Cutting Mach Operator |
| 2022-04-27 | Nuisance dust, respirable, <1% Qtz | 0.22 | 10 | 0.02 | Cutting Mach Operator |
| 2022-04-27 | Nuisance dust, respirable, <1% Qtz | 0.81 | 10 | 0.08 | Cutting Mach Operator |
| 2022-04-27 | Respirable dust, <.1mg | 0 | Drill Operator, Rotary | ||
| 2019-01-24 | Nuisance dust, total, <1% Qtz | 1.5 | 10 | 0.15 | Stone Polisher/Cutter |
| 2019-01-24 | Nuisance dust, total, <1% Qtz | 0.48 | 10 | 0.05 | Front-end Loader Operator |
| 2019-01-24 | Nuisance dust, total, <1% Qtz | 1.47 | 10 | 0.15 | Drill Operator, Rotary Air |
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
- Marble City Stone 1998 to 2013
- Marble City-Cedar Ridge Quarries 2013 to 2015
- Polycor Oklahoma Inc. 2015 to 2023
- Cooper Stone LLC 2023 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 2 |
| 2025 | 3 |
| 2024 | 3 |
| 2023 | 1 |
| 2022 | 7 |
| 2021 | 10 |
| 2020 | 8 |
| 2019 | 14 |
| 2018 | 15 |
| 2017 | 9 |
| 2016 | 8 |
| 2015 | 4 |
| 2014 | 7 |
| 2013 | 5 |
| 2010 | 1 |
| 2009 | 1 |
| 2008 | 1 |
| 2007 | 1 |
| 2006 | 1 |
| 2005 | 2 |
| 2004 | 2 |
| 2003 | 2 |
| 2002 | 2 |
| 2001 | 3 |
| 2000 | 4 |
Source: MSHA quarterly employment and production, updated weekly.
St Clair Quarry sits in Sequoyah County, Oklahoma, where the Census mining category is 1.4% 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.Sequoyah County, Oklahoma · Population 39,676
1.4%
Mining share of county employment
$49,795
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 | 16 | 0 | 0 | 0.0 |
| 2026 Q1 | 38 | 1 | 0 | 26315.8 |
| 2025 Q4 | 20 | 0 | 0 | 0.0 |
| 2025 Q3 | 18 | 0 | 0 | 0.0 |
| 2025 Q2 | 16 | 0 | 0 | 0.0 |
| 2025 Q1 | 16 | 0 | 0 | 0.0 |
| 2024 Q4 | 32 | 0 | 0 | 0.0 |
| 2024 Q3 | 18 | 0 | 0 | 0.0 |
Show 84 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 34 | 0 | 0 | 0.0 |
| 2024 Q1 | 96 | 0 | 0 | 0.0 |
| 2023 Q4 | 14 | 0 | 0 | 0.0 |
| 2023 Q3 | 15 | 0 | 0 | 0.0 |
| 2023 Q1 | 0 | 0 | 0 | |
| 2022 Q4 | 280 | 0 | 0 | 0.0 |
| 2022 Q3 | 2,007 | 0 | 0 | 0.0 |
| 2022 Q2 | 2,522 | 2 | 0 | 793.0 |
| 2022 Q1 | 4,185 | 0 | 0 | 0.0 |
| 2021 Q4 | 3,206 | 0 | 0 | 0.0 |
| 2021 Q3 | 4,634 | 0 | 0 | 0.0 |
| 2021 Q2 | 3,767 | 2 | 0 | 530.9 |
| 2021 Q1 | 3,990 | 0 | 0 | 0.0 |
| 2020 Q4 | 3,912 | 3 | 1 | 766.9 |
| 2020 Q3 | 3,869 | 0 | 0 | 0.0 |
| 2020 Q2 | 3,748 | 2 | 0 | 533.6 |
| 2020 Q1 | 3,955 | 1 | 0 | 252.8 |
| 2019 Q4 | 4,717 | 0 | 0 | 0.0 |
| 2019 Q3 | 4,866 | 0 | 0 | 0.0 |
| 2019 Q2 | 4,069 | 1 | 0 | 245.8 |
| 2019 Q1 | 3,098 | 2 | 0 | 645.6 |
| 2018 Q4 | 4,058 | 0 | 0 | 0.0 |
| 2018 Q3 | 5,221 | 0 | 0 | 0.0 |
| 2018 Q2 | 5,051 | 4 | 0 | 791.9 |
| 2018 Q1 | 3,054 | 0 | 0 | 0.0 |
| 2017 Q4 | 2,151 | 3 | 1 | 1394.7 |
| 2017 Q3 | 2,605 | 0 | 0 | 0.0 |
| 2017 Q2 | 2,282 | 0 | 0 | 0.0 |
| 2017 Q1 | 4,974 | 6 | 4 | 1206.3 |
| 2016 Q4 | 2,184 | 0 | 0 | 0.0 |
| 2016 Q3 | 3,343 | 0 | 0 | 0.0 |
| 2016 Q2 | 2,600 | 1 | 0 | 384.6 |
| 2016 Q1 | 2,525 | 0 | 0 | 0.0 |
| 2015 Q4 | 582 | 0 | 0 | 0.0 |
| 2015 Q2 | 2,294 | 0 | 0 | 0.0 |
| 2015 Q1 | 1,224 | 4 | 0 | 3268.0 |
| 2014 Q4 | 2,006 | 0 | 0 | 0.0 |
| 2014 Q3 | 3,225 | 0 | 0 | 0.0 |
| 2014 Q2 | 4,047 | 0 | 0 | 0.0 |
| 2014 Q1 | 3,084 | 7 | 4 | 2269.8 |
| 2013 Q4 | 3,700 | 0 | 0 | 0.0 |
| 2013 Q3 | 2,324 | 0 | 0 | 0.0 |
| 2013 Q2 | 1,995 | 0 | 0 | 0.0 |
| 2013 Q1 | 333 | 4 | 1 | 12012.0 |
| 2010 Q3 | 3 | 0 | 0 | 0.0 |
| 2010 Q2 | 2 | 0 | 0 | 0.0 |
| 2010 Q1 | 12 | 0 | 0 | 0.0 |
| 2009 Q4 | 10 | 0 | 0 | 0.0 |
| 2009 Q3 | 20 | 0 | 0 | 0.0 |
| 2009 Q2 | 168 | 0 | 0 | 0.0 |
| 2009 Q1 | 172 | 0 | 0 | 0.0 |
| 2008 Q4 | 180 | 0 | 0 | 0.0 |
| 2008 Q3 | 156 | 0 | 0 | 0.0 |
| 2008 Q2 | 200 | 0 | 0 | 0.0 |
| 2008 Q1 | 48 | 0 | 0 | 0.0 |
| 2007 Q4 | 36 | 0 | 0 | 0.0 |
| 2007 Q3 | 187 | 2 | 0 | 10695.2 |
| 2007 Q2 | 190 | 0 | 0 | 0.0 |
| 2007 Q1 | 75 | 0 | 0 | 0.0 |
| 2006 Q4 | 220 | 0 | 0 | 0.0 |
| 2006 Q3 | 106 | 1 | 0 | 9434.0 |
| 2006 Q2 | 81 | 0 | 0 | 0.0 |
| 2006 Q1 | 24 | 0 | 0 | 0.0 |
| 2005 Q4 | 24 | 0 | 0 | 0.0 |
| 2005 Q3 | 156 | 1 | 0 | 6410.3 |
| 2005 Q2 | 230 | 0 | 0 | 0.0 |
| 2005 Q1 | 66 | 0 | 0 | 0.0 |
| 2004 Q4 | 28 | 0 | 0 | 0.0 |
| 2004 Q3 | 53 | 0 | 0 | 0.0 |
| 2004 Q2 | 75 | 0 | 0 | 0.0 |
| 2004 Q1 | 150 | 0 | 0 | 0.0 |
| 2003 Q4 | 75 | 0 | 0 | 0.0 |
| 2003 Q3 | 35 | 0 | 0 | 0.0 |
| 2003 Q2 | 15 | 0 | 0 | 0.0 |
| 2003 Q1 | 4 | 1 | 0 | 250000.0 |
| 2002 Q4 | 24 | 0 | 0 | 0.0 |
| 2002 Q3 | 18 | 0 | 0 | 0.0 |
| 2002 Q2 | 4 | 0 | 0 | 0.0 |
| 2002 Q1 | 54 | 0 | 0 | 0.0 |
| 2001 Q4 | 30 | 0 | 0 | 0.0 |
| 2001 Q3 | 94 | 0 | 0 | 0.0 |
| 2001 Q2 | 186 | 5 | 2 | 26881.7 |
| 2001 Q1 | 57 | 0 | 0 | 0.0 |
| 2000 Q1 | 232 | 0 | 0 | 0.0 |
No fatalities recorded at this mine.
Reportable incidents
6 on file2019 · 1 incident
2018 · 2 incidents
February 21, 2018
OK · Metal/Non-Metal
laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman
HANDTOOLS (NONPOWERED)
Polycor Oklahoma Inc. · Over-exertion (Not Elsewhere Classified)
EE was cranking the bench vice when EE felt a sharp pain in the center of EE's back.
Polycor Oklahoma Inc. · Fall to the walkway or working surface
EE was walking on a trailer, slipped and fell because of the frost.
2017 · 1 incident
Polycor Oklahoma Inc. · Contact with heat
EMPLOYEE EXPERIENCED SYMPTOMS OF HEAT-RELATED ILLNESS.
2013 · 2 incidents
October 19, 2013
OK · Metal/Non-Metal
stone finishing and sizing personnel, stone/rock cut/polish/saw operator, splitter, cutter, trimmer
MACHINERY
Marble City-Cedar Ridge Quarries · Struck by rolling or sliding object
Employee was pulling a track off a rock and the track slid down suddenly and cut his ring finger on his right hand.
June 25, 2013
OK · Metal/Non-Metal
stone finishing and sizing personnel, stone/rock cut/polish/saw operator, splitter, cutter, trimmer
HANDLING OF MATERIALS
Marble City-Cedar Ridge Quarries · Over-exertion in lifting objects
EE was using a shovel to remove some dirt and heard his shoulder pop.