Montana Solid Rock Quarry #4 has $6K in proposed MSHA penalties and $453 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
5
Years on record
2006–2014
Latest incident
Dec 2014
Compliance record
MSHA citations since 2007
44
citations
16
significant & substantial
$5,809
proposed penalties
$5,356
paid to date
92% of proposed penalties paid to date, a $453 gap.
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: 404 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Montana Solid Rock Quarry #4 has $6K in proposed MSHA penalties and $453 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.
$6K
proposed penalties
$6K
current assessed
$5K
paid to date
$453
outstanding
44 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-06-04.
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.
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: 2026-06-09
33%
of limit-tested samples over the exposure limit
8
samples
3
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz31 over
Respirable dust, <.1mg5
Show the individual readings (8)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-06-04
Quartz, respirable, >1% Qtz
0.6
0.54
1.11
Cutting Mach Operator
2026-06-09
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2026-06-09
Respirable dust, <.1mg
0
Stone Polisher/Cutter
2026-06-09
Respirable dust, <.1mg
0
Stone Polisher/Cutter
2025-06-04
Quartz, respirable, >1% Qtz
0.19
0.56
0.34
Shovel Operator
2025-06-04
Quartz, respirable, >1% Qtz
0.26
0.46
0.57
Hand Loader
2010-09-09
Respirable dust, <.1mg
0
Front-end Loader Operator
2010-09-09
Respirable dust, <.1mg
0
Stone Polisher/Cutter
Area samples (mill and shop air)
Last sampled: 2016-09-28, 9 years ago
2
samples
Show the individual readings (2)
Date
Contaminant
Concentration
Limit
Conc / limit
Area sampled
2016-09-28
Quartz, respirable, >1% Qtz
0.57
SF ORE PROCESSING
2016-09-28
Quartz, respirable, >1% Qtz
0.75
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
6
2025
6
2024
5
2023
5
2022
8
2021
7
2020
5
2019
5
2018
7
2017
5
2016
10
2015
7
2014
7
2013
5
2012
3
2011
3
2010
3
2009
3
2008
4
2007
2
2006
3
Source: MSHA quarterly employment and production, updated weekly.
Montana Solid Rock Quarry #4 sits in Sanders County, Montana, where the Census mining category is 0.8% 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.
Sanders County, Montana · Population 12,936
0.8%
Mining share of county employment
$54,035
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
2,471
0
0
0.0
2026 Q1
1,697
0
0
0.0
2025 Q4
1,880
0
0
0.0
2025 Q3
2,382
0
0
0.0
2025 Q2
2,771
3
1
1082.6
2025 Q1
2,499
0
0
0.0
2024 Q4
2,508
0
0
0.0
2024 Q3
609
0
0
0.0
Show 74 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
647
0
0
0.0
2024 Q1
3,018
3
0
994.0
2023 Q4
2,375
0
0
0.0
2023 Q3
3,019
0
0
0.0
2023 Q2
1,538
0
0
0.0
2023 Q1
1,427
0
0
0.0
2022 Q4
2,328
0
0
0.0
2022 Q3
2,030
0
0
0.0
2022 Q2
2,371
0
0
0.0
2022 Q1
2,146
0
0
0.0
2021 Q4
2,430
0
0
0.0
2021 Q3
2,277
0
0
0.0
2021 Q2
2,611
3
1
1149.0
2021 Q1
2,861
0
0
0.0
2020 Q4
2,436
0
0
0.0
2020 Q3
2,833
0
0
0.0
2020 Q2
1,450
2
0
1379.3
2020 Q1
0
0
0
2019 Q4
0
0
0
2019 Q3
1,434
0
0
0.0
2019 Q2
2,370
1
0
421.9
2019 Q1
1,336
0
0
0.0
2018 Q4
1,023
0
0
0.0
2018 Q3
2,065
0
0
0.0
2018 Q2
1,764
0
0
0.0
2018 Q1
365
0
0
0.0
2017 Q4
506
4
2
7905.1
2017 Q3
278
0
0
0.0
2017 Q2
3,387
0
0
0.0
2017 Q1
1,279
0
0
0.0
2016 Q4
655
4
0
6106.9
2016 Q3
2,204
0
0
0.0
2016 Q2
702
0
0
0.0
2016 Q1
442
6
1
13574.7
2015 Q4
195
0
0
0.0
2015 Q3
1,665
3
2
1801.8
2015 Q2
1,524
0
0
0.0
2015 Q1
1,733
1
0
577.0
2014 Q4
2,270
0
0
0.0
2014 Q3
2,424
0
0
0.0
2014 Q2
2,131
1
1
469.3
2014 Q1
2,054
1
1
486.9
2013 Q4
1,687
0
0
0.0
2013 Q3
2,135
5
3
2341.9
2013 Q2
1,335
0
0
0.0
2013 Q1
1,171
2
1
1707.9
2012 Q4
753
0
0
0.0
2012 Q3
676
0
0
0.0
2012 Q2
449
2
2
4454.3
2012 Q1
415
0
0
0.0
2011 Q4
781
0
0
0.0
2011 Q3
1,900
0
0
0.0
2011 Q2
90
0
0
0.0
2011 Q1
151
0
0
0.0
2010 Q4
921
0
0
0.0
2010 Q3
671
0
0
0.0
2010 Q2
513
0
0
0.0
2010 Q1
772
0
0
0.0
2009 Q4
460
0
0
0.0
2009 Q3
58
0
0
0.0
2009 Q2
263
0
0
0.0
2009 Q1
375
0
0
0.0
2008 Q4
1,057
0
0
0.0
2008 Q3
483
0
0
0.0
2008 Q2
1,701
2
1
1175.8
2008 Q1
0
0
0
2007 Q4
0
0
0
2007 Q3
300
0
0
0.0
2007 Q2
1,129
1
0
885.7
2007 Q1
1,887
0
0
0.0
2006 Q4
1,580
0
0
0.0
2006 Q3
437
0
0
0.0
2006 Q2
1,769
0
0
0.0
2006 Q1
155
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
5 on file
2014 · 2 incidents
December 16, 2014MT · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
On 6/17/08 employee notified supervisor that he had a very painful left shoulder. He advised us at that time he started to experience soreness in his shoulder a couple of weeks ago. He went to the local clinic on 6/17/08 to have it checked. He was taken off work pending further evaluation. The clinic referred him to another facility for tests.
April 11, 2008MT · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
tweaked his back and went home to rest. EE call in sick the week of 4/14, ask for work comp on 4/11/08. MSRQ is in the process of verifying the date, te name of treating physicians and what treatment received. MSRQ will also attempt to verify previous and present medical restrict if any.
2006 · 1 incident
July 17, 2006MT · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS