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: 241 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Crusher Plant #1 has $2K in proposed MSHA penalties and $0 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.
$2K
proposed penalties
$2K
current assessed
$2K
paid to date
$0
outstanding
15 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2024-05-01.
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: 2025-09-23
5
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg5
Show the individual readings (5)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-09-23
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-03-10
Respirable dust, <.1mg
0
Crusher Oper/Worker
2020-03-10
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-11-01
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-11-01
Respirable dust, <.1mg
0
Front-end Loader Operator
Area samples (mill and shop air)
Last sampled: 2014-10-29, 11 years ago
1
samples
Show the individual readings (1)
Date
Contaminant
Concentration
Limit
Conc / limit
Area sampled
2014-10-29
Respirable dust, <.1mg
0
Cab of # 649 J D F.E
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
2025
2
2024
2
2023
2
2022
2
2021
2
2020
2
2019
2
2018
2
2017
2
2016
2
2015
1
2014
1
2013
1
2012
1
2011
1
2010
1
2009
2
2008
2
Source: MSHA quarterly employment and production, updated weekly.
Crusher Plant #1 sits in Yellowstone County, Montana, 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.
Yellowstone County, Montana · Population 167,340
1.4%
Mining share of county employment
$74,400
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
2025 Q4
22
0
0
0.0
2025 Q3
58
0
0
0.0
2025 Q2
204
0
0
0.0
2025 Q1
141
0
0
0.0
2024 Q4
291
0
0
0.0
2024 Q3
245
0
0
0.0
2024 Q1
63
0
0
0.0
2023 Q4
338
0
0
0.0
Show 58 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2023 Q3
71
0
0
0.0
2023 Q2
151
0
0
0.0
2023 Q1
241
0
0
0.0
2022 Q4
96
0
0
0.0
2022 Q3
125
0
0
0.0
2022 Q2
240
0
0
0.0
2022 Q1
227
0
0
0.0
2021 Q4
221
1
0
4524.9
2021 Q3
222
0
0
0.0
2021 Q2
356
0
0
0.0
2021 Q1
299
0
0
0.0
2020 Q4
311
0
0
0.0
2020 Q3
96
0
0
0.0
2020 Q2
31
0
0
0.0
2019 Q4
333
0
0
0.0
2019 Q3
291
0
0
0.0
2019 Q2
295
2
0
6779.7
2019 Q1
137
0
0
0.0
2018 Q4
283
0
0
0.0
2018 Q3
144
0
0
0.0
2018 Q2
0
0
0
2018 Q1
198
0
0
0.0
2017 Q4
270
1
0
3703.7
2017 Q3
218
0
0
0.0
2017 Q2
265
0
0
0.0
2017 Q1
158
0
0
0.0
2016 Q4
245
1
0
4081.6
2016 Q3
81
0
0
0.0
2016 Q2
117
1
0
8547.0
2016 Q1
180
0
0
0.0
2015 Q4
198
0
0
0.0
2015 Q3
0
0
0
2015 Q2
0
0
0
2015 Q1
200
0
0
0.0
2014 Q4
108
0
0
0.0
2014 Q3
0
0
0
2014 Q2
172
0
0
0.0
2014 Q1
12
0
0
0.0
2013 Q4
159
0
0
0.0
2013 Q3
0
0
0
2013 Q2
179
0
0
0.0
2013 Q1
286
0
0
0.0
2012 Q4
81
0
0
0.0
2012 Q3
0
0
0
2012 Q2
0
0
0
2012 Q1
256
0
0
0.0
2011 Q4
100
0
0
0.0
2011 Q3
0
0
0
2011 Q2
362
1
0
2762.4
2011 Q1
160
0
0
0.0
2010 Q4
155
0
0
0.0
2010 Q2
693
0
0
0.0
2010 Q1
156
0
0
0.0
2009 Q4
200
0
0
0.0
2009 Q3
61
0
0
0.0
2009 Q2
370
0
0
0.0
2009 Q1
520
1
0
1923.1
2008 Q4
76
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
1 on file
2011 · 1 incident
January 26, 2011MT · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
The mechanic was clearing out mud in the throat of the crusher when the door came down and hit his hard hat. He went to Occupational Health on 1-31-11 because his neck was stiff.
Related mines
Other mines operated by Yellowstone County Road Department