Powder River Proppants, LLC · Struck against stationary object
Employee stepped on a nail. puncturing through EE's left boot into EE's left big toe.
Glenrock Mine 01: 20 MSHA citations Metal/Non-Metal
Powder River Proppants, LLC
· Surface
Controlled by
BGD LLC; Founders of PRP LLC
Glenrock,
Converse County,
WY
·
Active
MSHA Mine ID: 4801891
Glenrock Mine 01 has $11K in proposed MSHA penalties and $10K outstanding across 1 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 4
- Years on record
- 2025–2026
- Latest incident
- Jan 2026
Compliance record
MSHA citations since 2024
20
citations
5
significant & substantial
$11,303
proposed penalties
$1,357
paid to date
12% of proposed penalties paid to date, a $9,946 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2024
8
inspections on record
262
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: 262 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Glenrock Mine 01 has $11K in proposed MSHA penalties and $10K 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.$11K
proposed penalties
$11K
current assessed
$1K
paid to date
$10K
outstanding
10 assessments are final orders; 1 contested dockets.
As of the most recent assessment on 2026-04-07.
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.25.0%
significant & substantial
5.0%
high negligence or reckless
25.0%
reasonably likely or greater
20.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 25.0% low, 70.0% moderate, 5.0% 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.
6
citations taken to the federal commission · 30% of citations on record
- Still open 6 · 100%
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 2026-01-18.
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 |
|---|---|---|---|---|
| WEST 2026-0073 | Decision pending |
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: 2025-03-19
ⓘ
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
5
samples
2
limit-tested
Most sampled contaminants
- Respirable dust, <.1mg3
- Quartz, respirable, >1% Qtz2
Show the individual readings (5)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2025-03-19 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2025-03-19 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2025-03-19 | Quartz, respirable, >1% Qtz | 0.25 | 0.52 | 0.48 | Laborer, Bullgang |
| 2025-03-19 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2025-03-19 | Quartz, respirable, >1% Qtz | 0.26 | 0.38 | 0.68 | Bobcat Operator |
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.
Glenrock Mine 01 recorded 7.74 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘ
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, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.7.74
total case rate
5.16
days-away rate
0.000
fatality rate
Above average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Wyoming, metal and nonmetal mining averaged 1.96 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.
Ownership history
- Powder River Proppants, LLC 2024 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 22 |
| 2025 | 20 |
| 2024 | 21 |
Source: MSHA quarterly employment and production, updated weekly.
Glenrock Mine 01 sits in Converse County, Wyoming, where the Census mining category is 14.1% 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.Converse County, Wyoming · Population 13,759
14.1%
Mining share of county employment
$79,164
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 | 23,005 | 1 | 0 | 43.5 |
| 2026 Q1 | 10,919 | 0 | 0 | 0.0 |
| 2025 Q4 | 12,996 | 4 | 1 | 307.8 |
| 2025 Q3 | 28,512 | 4 | 2 | 140.3 |
| 2025 Q2 | 16,894 | 0 | 0 | 0.0 |
| 2025 Q1 | 19,158 | 5 | 1 | 261.0 |
| 2024 Q4 | 9,770 | 4 | 0 | 409.4 |
No fatalities recorded at this mine.
Reportable incidents
4 on file2026 · 1 incident
2025 · 3 incidents
Powder River Proppants, LLC · Inhalation of radiations, caustics, toxic and noxious substances
Employee was welding wear iron on an excavator bucket when a wind shift reduced ventilation, leading to fume inhalation. The employee reported shortness of breath and chest pressure and received first aid on site before being transported to the ER. The employee was released the same day, cleared to return to work the next day, and diagnosed with airway irritation.
September 11, 2025
WY · Metal/Non-Metal
bulldozer operator, universal operator, heavy equipment operator, operating engineer
MACHINERY
Powder River Proppants, LLC · Struck against a moving object
Employee was Operating a haul truck being loaded by an excavator. Employee stated that the Excavator struck the haul truck on the back and caused an injury to Employees Neck/Back. Employee refused first aid and or urgent care. Employee later turned in medical paperwork to MSHA.
Powder River Proppants, LLC · Struck by falling object
The employee was removing/replacing the guard while the bucket elevator ran. The guard slipped into the opening, getting caught by moving buckets, causing the guard to slam down on employee's lower leg, causing a tibia and fibula fracture.