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: 539 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Yogo Sapphire Mine has $9K 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.
$9K
proposed penalties
$9K
current assessed
$9K
paid to date
$0
outstanding
50 assessments are final orders; 1 contested dockets.
Of $1K in penalties contested before the Commission, $700 was upheld in final decisions.
As of the most recent assessment on 2024-01-30.
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.
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: 2026-09-22
2
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg2
Show the individual readings (2)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-09-22
Respirable dust, <.1mg
0
Supervisor, Co. Official
2026-09-22
Respirable dust, <.1mg
0
Engineer
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.
Yogo Sapphire Mine recorded 0.00 reportable injury cases per 100 full-time workers in 2023.
Injury rate, 2023
ⓘThis rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000 and are withheld below 20,000 hours in a year. Employment reports reach back to 1983, but those earlier years come from MSHA's archived file format and are not used in rates.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 1.78 and the all-US-mining average was 2.10 cases per 100 workers.
In Montana, metal and nonmetal mining averaged 3.01 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2024
12
2023
12
2022
9
2021
10
2020
5
2001
2
2000
0
1999
0
1998
0
1997
0
1996
2
1995
3
1994
2
1993
2
1992
5
1991
4
1990
4
1989
4
1988
2
1987
1
1986
1
1985
1
1984
5
1983
4
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Yogo Sapphire Mine sits in Judith Basin County, Montana, where the Census mining category is 0.0% 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.
Judith Basin County, Montana · Population 2,053
0.0%
Mining share of county employment
$55,417
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; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. 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
2024 Q1
4,155
2
0
481.3
2023 Q4
5,304
7
0
1319.8
2023 Q3
5,359
4
0
746.4
2023 Q2
4,970
3
0
603.6
2023 Q1
5,002
4
0
799.7
2022 Q4
5,165
4
0
774.4
2022 Q3
3,985
1
0
250.9
2022 Q2
2,240
2
0
892.9
Show 11 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2022 Q1
2,386
0
0
0.0
2021 Q4
5,541
5
0
902.4
2021 Q3
5,320
0
0
0.0
2021 Q2
4,305
9
1
2090.6
2021 Q1
3,620
0
0
0.0
2020 Q4
3,182
0
0
0.0
2020 Q3
2,398
0
0
0.0
2020 Q2
241
0
0
0.0
2001 Q3
0
0
0
2001 Q2
1,099
9
4
8189.3
2000 Q1
0
0
0
No fatalities recorded at this mine.
Reportable incidents
3 on file
1994 · 1 incident
July 20, 1994MT · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorHANDLING OF MATERIALS
Amax Exploration Inc · Caught in, under or between a moving and a stationary object
EMPLOYEE WAS ATTEMPTIN GOT REMOVE AN OVERSIZE ROCK FROM GIRZZLY OVER FEED HOPPER AND PINCHE DMIDDLE FINGER, LEFT HAND, FINGER REQUIRED MEDICAL ATTENTION (STITCHES) BUT DID NTO BREAK ANY BONES.
Show 2 earlier incidentsHide earlier incidents
1988 · 2 incidents
September 28, 1988MT · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSLIP OR FALL OF PERSON
EMPL WAS SUPERVBISING EXCAVATION WORK & TURNED HIS HEAD & BACK TO OPERATOR TO EXPLAIN SOMETHING TO ANOTHER EMPL. EXCATOR OPERATOR FAILED TO SEE EMPL SWUNG BUCKET HIT EMPL.