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: 374 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
CASTLE ROCK has $5K 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.
$5K
proposed penalties
$5K
current assessed
$5K
paid to date
$0
outstanding
23 assessments are final orders; 1 contested dockets.
Of $4K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2025-07-10.
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.
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.
2citations taken to the federal commission · 9% of citations on record
Settled
1 · 50%
Vacated or withdrawn
1 · 50%
50%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 2 decided S&S contests · industry: 79%
38%
Penalty reduction in decided contests
$4K proposed, $2K 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2013-08-06.
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.
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: 2026-05-13
0%
of limit-tested samples over the exposure limit
10
samples
7
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz7
Respirable dust, <.1mg3
Show the individual readings (10)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-05-13
Respirable dust, <.1mg
0
Rotary Bucket Ex. Operator
2026-05-13
Respirable dust, <.1mg
0
Front-end Loader Operator
2021-07-29
Quartz, respirable, >1% Qtz
0.38
0.52
0.73
Forklift Operator
2021-07-29
Quartz, respirable, >1% Qtz
0.39
0.63
0.62
Supervisor, Co. Official
2009-10-21
Quartz, respirable, >1% Qtz
0.15
1.01
0.15
Laborer, Bullgang
2009-10-21
Respirable dust, <.1mg
0
Backhoe Operator
2009-10-21
Quartz, respirable, >1% Qtz
0.13
0.57
0.23
Forklift Operator
2002-06-26
Quartz, respirable, >1% Qtz
0.16
1.14
0.14
Front-end Loader Operator
2002-06-26
Quartz, respirable, >1% Qtz
0.25
1.35
0.19
Gathering Arm Operator
2002-06-26
Quartz, respirable, >1% Qtz
0.31
0.34
0.91
Stone Polisher/Cutter
Area samples (mill and shop air)
Last sampled: 2014-06-19, 12 years ago
1
samples
Show the individual readings (1)
Date
Contaminant
Concentration
Limit
Conc / limit
Area sampled
2014-06-19
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
2
2025
2
2024
2
2023
2
2022
2
2021
3
2020
2
2019
2
2018
1
2017
1
2016
2
2015
1
2014
1
2013
2
2012
2
2011
1
2010
2
2009
4
2008
5
2007
9
2006
12
2005
10
2004
5
2003
6
2002
5
2001
4
Source: MSHA quarterly employment and production, updated weekly.
CASTLE ROCK sits in Flathead County, Montana, where the Census mining category is 0.7% 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.
Flathead County, Montana · Population 108,445
0.7%
Mining share of county employment
$71,327
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
A sales person from another company was selecting rock when the quarry was not operational. While on the main of quarry in the step section, EE stepped on a 8" rock and it tipped. EE lost EE's balance and staggered backwards trying to catch self. Fell into one pallet of steps about 4-5 feet tall spun over the corner backwards into a second pallet before falling to the ground.
2007 · 1 incident
September 19, 2007MT · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanMACHINERY