2 employees were barring out a hopper together. One employee was brushing loose material away while the other continued barring and crushed the first employee's left middle finger between the bar and the grizzly, breaking it.
HT Plant: 96 MSHA citations Metal/Non-Metal
HT Plant has $26K in proposed MSHA penalties and $151 outstanding across 2 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 20
- Years on record
- 1997–2023
- Latest incident
- Aug 2023
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.HT Plant has $26K in proposed MSHA penalties and $151 outstanding across 2 contested dockets.
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.ⓘ
Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.ⓘ
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.- Settled 1 · 50%
- Stood as issued 1 · 50%
ⓘ
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.ⓘ
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.| Docket | Decision | Judge | Year | Proposed / upheld |
|---|---|---|---|---|
| WEST 2017-0136 | Settlement | Simonton | 2017 | $6K → $450 |
| WEST 2003-278M | Dismissal | Bulluck | 2004 | $55 → $0 |
ⓘ
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: 2025-12-16
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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.- Quartz, respirable, >1% Qtz15
- Respirable dust, <.1mg4
- Cristobalite, respirable3
- Unlisted Particulate, respirable, <1% Qtz3
Show the individual readings (25)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2025-12-16 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2025-12-16 | Quartz, respirable, >1% Qtz | 0.17 | Cleanup Man | ||
| 2024-07-25 | Quartz, respirable, >1% Qtz | 0.12 | Dry Screen Plant Operator | ||
| 2024-07-25 | Quartz, respirable, >1% Qtz | 0.67 | 0.84 | 0.80 | Pipe Fitter/Millright/Plumber |
| 2023-09-20 | Respirable dust, <.1mg | 0 | Hammer Mill Operator | ||
| 2023-09-20 | Respirable dust, <.1mg | 0 | Utility Man | ||
| 2021-08-16 | Quartz, respirable, >1% Qtz | 0.18 | Mechanic | ||
| 2021-08-16 | Respirable dust, <.1mg | 0 | Dry Screen Plant Operator | ||
| 2021-08-16 | Unlisted Particulate, respirable, <1% Qtz | 0.13 | Utility Man | ||
| 2019-05-10 | Quartz, respirable, >1% Qtz | 0.36 | Mechanic | ||
| 2019-05-10 | Unlisted Particulate, respirable, <1% Qtz | 0 | Front-end Loader Operator | ||
| 2019-05-10 | Cristobalite, respirable | 0 | Front-end Loader Operator | ||
| 2019-05-10 | Cristobalite, respirable | 0.36 | Mechanic | ||
| 2019-05-10 | Quartz, respirable, >1% Qtz | 0.22 | Kiln/Dryer Operator | ||
| 2019-05-10 | Cristobalite, respirable | 0.22 | Kiln/Dryer Operator | ||
| 2019-01-08 | Quartz, respirable, >1% Qtz | 0.24 | Front-end Loader Operator | ||
| 2019-01-08 | Quartz, respirable, >1% Qtz | 0.74 | Crusher Oper/Worker | ||
| 2014-04-02 | Quartz, respirable, >1% Qtz | 1.01 | 1.4 | 0.72 | Kiln/Dryer Operator |
| 2011-01-20 | Quartz, respirable, >1% Qtz | 1.34 | 1.66 | 0.81 | Welder, etc. |
| 2011-01-20 | Quartz, respirable, >1% Qtz | 0.66 | 2.17 | 0.30 | Dry Screen Plant Operator |
| 2009-02-05 | Unlisted Particulate, respirable, <1% Qtz | 0.27 | Front-end Loader Operator | ||
| 2009-02-05 | Quartz, respirable, >1% Qtz | 0.41 | 2.02 | 0.20 | Mechanic |
| 2009-02-05 | Quartz, respirable, >1% Qtz | 0.29 | 1.88 | 0.15 | Kiln/Dryer Operator |
| 2005-03-22 | Quartz, respirable, >1% Qtz | 0.57 | 0.9 | 0.63 | Kiln/Dryer Operator |
| 2005-03-22 | Quartz, respirable, >1% Qtz | 0.46 | 0.88 | 0.52 | Front-end Loader Operator |
HT Plant recorded 0.00 reportable injury cases per 100 full-time workers in 2025.
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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.| Year | total case rate | days-away | fatal |
|---|---|---|---|
| 2025 * | 0.00 | 0.00 | 0.000 |
| 2024 * | 0.00 | 0.00 | 0.000 |
| 2023 * | 8.69 | 8.69 | 0.000 |
| 2022 * | 8.46 | 0.00 | 0.000 |
| 2021 * | 0.00 | 0.00 | 0.000 |
| 2020 * | 18.27 | 18.27 | 0.000 |
| 2019 * | 13.44 | 0.00 | 0.000 |
| 2018 * | 12.38 | 6.19 | 0.000 |
- Black Hills Bentonite 1997 to present
| Year | Employees |
|---|---|
| 2026 | 9 |
| 2025 | 9 |
| 2024 | 10 |
| 2023 | 8 |
| 2022 | 10 |
| 2021 | 20 |
| 2020 | 16 |
| 2019 | 13 |
| 2018 | 13 |
| 2017 | 15 |
| 2016 | 14 |
| 2015 | 15 |
| 2014 | 12 |
| 2013 | 10 |
| 2012 | 14 |
| 2011 | 12 |
| 2010 | 14 |
| 2009 | 13 |
| 2008 | 13 |
| 2007 | 13 |
| 2006 | 12 |
| 2005 | 12 |
| 2004 | 11 |
| 2003 | 12 |
| 2002 | 12 |
| 2001 | 13 |
| 2000 | 14 |
HT Plant sits in Natrona County, Wyoming, where the Census mining category is 6.5% of county employment.
ⓘ
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.ⓘ
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.| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2026 Q2 | 4,260 | 1 | 0 | 234.7 |
| 2026 Q1 | 4,663 | 0 | 0 | 0.0 |
| 2025 Q4 | 5,625 | 1 | 0 | 177.8 |
| 2025 Q3 | 4,417 | 1 | 0 | 226.4 |
| 2025 Q2 | 5,309 | 0 | 0 | 0.0 |
| 2025 Q1 | 5,597 | 0 | 0 | 0.0 |
| 2024 Q4 | 6,530 | 3 | 0 | 459.4 |
| 2024 Q3 | 5,439 | 7 | 2 | 1287.0 |
Show 98 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 7,305 | 0 | 0 | 0.0 |
| 2024 Q1 | 6,350 | 0 | 0 | 0.0 |
| 2023 Q4 | 6,244 | 1 | 0 | 160.2 |
| 2023 Q3 | 5,901 | 0 | 0 | 0.0 |
| 2023 Q2 | 6,420 | 0 | 0 | 0.0 |
| 2023 Q1 | 4,449 | 0 | 0 | 0.0 |
| 2022 Q4 | 8,751 | 0 | 0 | 0.0 |
| 2022 Q3 | 5,430 | 0 | 0 | 0.0 |
| 2022 Q2 | 4,106 | 2 | 0 | 487.1 |
| 2022 Q1 | 5,345 | 2 | 0 | 374.2 |
| 2021 Q4 | 10,017 | 0 | 0 | 0.0 |
| 2021 Q3 | 9,524 | 2 | 0 | 210.0 |
| 2021 Q2 | 6,583 | 0 | 0 | 0.0 |
| 2021 Q1 | 6,583 | 0 | 0 | 0.0 |
| 2020 Q4 | 9,052 | 3 | 0 | 331.4 |
| 2020 Q3 | 8,510 | 5 | 2 | 587.5 |
| 2020 Q2 | 7,183 | 0 | 0 | 0.0 |
| 2020 Q1 | 8,103 | 2 | 1 | 246.8 |
| 2019 Q4 | 8,076 | 0 | 0 | 0.0 |
| 2019 Q3 | 7,119 | 0 | 0 | 0.0 |
| 2019 Q2 | 7,028 | 6 | 1 | 853.7 |
| 2019 Q1 | 7,542 | 1 | 1 | 132.6 |
| 2018 Q4 | 7,395 | 0 | 0 | 0.0 |
| 2018 Q3 | 8,676 | 0 | 0 | 0.0 |
| 2018 Q2 | 7,642 | 0 | 0 | 0.0 |
| 2018 Q1 | 8,593 | 0 | 0 | 0.0 |
| 2017 Q4 | 7,793 | 2 | 0 | 256.6 |
| 2017 Q3 | 8,397 | 0 | 0 | 0.0 |
| 2017 Q2 | 8,745 | 3 | 0 | 343.1 |
| 2017 Q1 | 8,709 | 2 | 0 | 229.6 |
| 2016 Q4 | 9,039 | 0 | 0 | 0.0 |
| 2016 Q3 | 9,001 | 3 | 0 | 333.3 |
| 2016 Q2 | 9,533 | 0 | 0 | 0.0 |
| 2016 Q1 | 9,503 | 3 | 1 | 315.7 |
| 2015 Q4 | 6,365 | 0 | 0 | 0.0 |
| 2015 Q3 | 6,337 | 0 | 0 | 0.0 |
| 2015 Q2 | 7,005 | 1 | 0 | 142.8 |
| 2015 Q1 | 6,763 | 0 | 0 | 0.0 |
| 2014 Q4 | 7,915 | 1 | 0 | 126.3 |
| 2014 Q3 | 7,981 | 0 | 0 | 0.0 |
| 2014 Q2 | 6,614 | 4 | 1 | 604.8 |
| 2014 Q1 | 5,867 | 1 | 0 | 170.4 |
| 2013 Q4 | 7,255 | 0 | 0 | 0.0 |
| 2013 Q3 | 7,102 | 0 | 0 | 0.0 |
| 2013 Q2 | 6,702 | 2 | 0 | 298.4 |
| 2013 Q1 | 5,425 | 0 | 0 | 0.0 |
| 2012 Q4 | 7,662 | 4 | 1 | 522.1 |
| 2012 Q3 | 7,622 | 0 | 0 | 0.0 |
| 2012 Q2 | 7,629 | 0 | 0 | 0.0 |
| 2012 Q1 | 7,888 | 0 | 0 | 0.0 |
| 2011 Q4 | 7,522 | 0 | 0 | 0.0 |
| 2011 Q3 | 7,285 | 0 | 0 | 0.0 |
| 2011 Q2 | 7,062 | 0 | 0 | 0.0 |
| 2011 Q1 | 7,390 | 0 | 0 | 0.0 |
| 2010 Q4 | 6,568 | 2 | 1 | 304.5 |
| 2010 Q3 | 6,828 | 0 | 0 | 0.0 |
| 2010 Q2 | 7,500 | 2 | 1 | 266.7 |
| 2010 Q1 | 7,184 | 0 | 0 | 0.0 |
| 2009 Q4 | 6,720 | 0 | 0 | 0.0 |
| 2009 Q3 | 6,495 | 0 | 0 | 0.0 |
| 2009 Q2 | 6,514 | 2 | 0 | 307.0 |
| 2009 Q1 | 6,679 | 1 | 0 | 149.7 |
| 2008 Q4 | 6,303 | 0 | 0 | 0.0 |
| 2008 Q3 | 6,586 | 0 | 0 | 0.0 |
| 2008 Q2 | 6,823 | 5 | 0 | 732.8 |
| 2008 Q1 | 7,282 | 0 | 0 | 0.0 |
| 2007 Q4 | 7,191 | 8 | 5 | 1112.5 |
| 2007 Q3 | 7,225 | 1 | 0 | 138.4 |
| 2007 Q2 | 6,953 | 0 | 0 | 0.0 |
| 2007 Q1 | 7,490 | 2 | 0 | 267.0 |
| 2006 Q4 | 6,926 | 0 | 0 | 0.0 |
| 2006 Q3 | 5,717 | 1 | 1 | 174.9 |
| 2006 Q2 | 6,386 | 0 | 0 | 0.0 |
| 2006 Q1 | 6,577 | 2 | 1 | 304.1 |
| 2005 Q4 | 6,537 | 0 | 0 | 0.0 |
| 2005 Q3 | 6,627 | 1 | 0 | 150.9 |
| 2005 Q2 | 6,706 | 0 | 0 | 0.0 |
| 2005 Q1 | 6,602 | 1 | 0 | 151.5 |
| 2004 Q4 | 5,884 | 0 | 0 | 0.0 |
| 2004 Q3 | 5,420 | 0 | 0 | 0.0 |
| 2004 Q2 | 3,969 | 0 | 0 | 0.0 |
| 2004 Q1 | 5,765 | 2 | 0 | 346.9 |
| 2003 Q4 | 8,394 | 0 | 0 | 0.0 |
| 2003 Q3 | 7,834 | 0 | 0 | 0.0 |
| 2003 Q2 | 7,422 | 0 | 0 | 0.0 |
| 2003 Q1 | 7,447 | 0 | 0 | 0.0 |
| 2002 Q4 | 6,878 | 1 | 0 | 145.4 |
| 2002 Q3 | 6,817 | 0 | 0 | 0.0 |
| 2002 Q2 | 6,657 | 0 | 0 | 0.0 |
| 2002 Q1 | 6,748 | 0 | 0 | 0.0 |
| 2001 Q4 | 6,518 | 0 | 0 | 0.0 |
| 2001 Q3 | 6,637 | 0 | 0 | 0.0 |
| 2001 Q2 | 6,759 | 1 | 1 | 148.0 |
| 2001 Q1 | 7,355 | 1 | 0 | 136.0 |
| 2000 Q4 | 7,224 | 0 | 0 | 0.0 |
| 2000 Q3 | 7,648 | 0 | 0 | 0.0 |
| 2000 Q2 | 7,330 | 0 | 0 | 0.0 |
| 2000 Q1 | 7,622 | 0 | 0 | 0.0 |
Reportable incidents
20 on file2023 · 1 incident
2022 · 1 incident
Employee was cleaning material out of the Mill Hopper when an air cannon purged and shot dust and debris at the employees legs causing bruising and abrasions the front of the thighs and shins.
2020 · 3 incidents
Employee had completed a welding project on the hopper. The employee was cleaning up the work area and packing tools out of the area. As the emplyee was lifting a 5 gallon bucket full of tools up onto the service cart, they felt a sharp pain in their right shoulder. Employee is going to seek orthopedic examination at this time.
While unclogging a pin mill, the employee accidently stepped on the remote switch lowering the pin mill lid on top of themselves, crushing them between the lid and the pin mill. This resulted in a fractured vertebre and a loss of sensation in the right leg.
While working with metal, performing maintenance duties, the worker cut their hand while trying to catch a falling piece of metal.
2019 · 2 incidents
A roofing contractor was in the process of installing new sheet metal at the plant, when the sheet of metal they were holding slipped in their hands cutting through the leather gloves they were wearing. The sheet metal cut the contractors left thumb resulting in stitches.
While cleaning the plant at the end of the shift the employee struck their elbow on an elevator, the elbow became swollen and needed to be checked out.
2018 · 2 incidents
The employee was installing heater pipes when they struck their shoulder against an upright pipe flange. The employee went to the doctor a couple weeks later due to the pain they were experiencing, and on 12/27/2018, quit working.
Employee was barring mud out of a dryer conveyor belt tail roll. The bar slipped in the employee's hands, crushing the pinky finger on the right hand between the bar and the tail roll housing.
2017 · 1 incident
Employee was climbing out of the front end loader when they slipped off the ladder pulling and hurting a shoulder
2015 · 1 incident
Employee was changing a carbon bag when he slipped and fell coming off the stairs he fell from the bottom step and landed on his left wrist breaking it in 2 places.
2013 · 2 incidents
EE was spotting slow moving railcars with PPE on when he stumbled and fell on top of a car onto his right shoulder and back. He did not file an accident report until now, having worked for many weeks with pain in the right shoulder. Recent diagnostics on 09/30/2013 reveal a torn cartilage that will soon require surgery. No time has been lost as yet.
EE was operating front-end loader over rough ground when he felt pain in lower back. EE experienced herniated disc in 2005; may be re-occurrence. EE is now seeing Chiropractor.
2007 · 2 incidents
Third deck hammer-mill area had 28x48 inch deck plate removed for transporting maintenance equipment. It was left open and employee went into area to clean magnets in feed chute, apparently forgot or did not see opening and fell 25' 9" to concrete floor below and sustained serious injuries - many broken bones. See Report
Employee was cutting string on bulk bag when the knife slipped around his left thumb, causing a laceration that required 10 stitches at the emergency room. The employee has not missed time at work.
2005 · 1 incident
Employee was bending over a railing to clean out a pin-mixer when he felt a sudden pain in lower back. He visited Chiropractor several days later; x-rays reveal a slipped disc in lumbar region. No work for 2-4 weeks as per doctor.
2002 · 1 incident
INJURED WRIST WHILE OPERATING FRONT-END LOADER. AT THE END OF SHIFT, EE FELT SOME DISCOMFORT IN HIS LEFT WRIST, PROBABLY DUE TO REPETITIVE MOTION WHILE OPERATING THE FRONT END LOADER. A VISIT TO THE DR. REVEALED A SWOLLEN OR SPRAINED TENDON IN THE WRIST.
2000 · 1 incident
EE WAS STEPPING DOWN FROM A 4' LADDER WITH TOOLS IN HANDS WHEN HE LOST HIS BALANCE AND FELL DOWN ON TOP OF SOME OF THESE ITEMS, BEING STRUCK IN THE PUBIC REGION AND SUSTAINING A BRUISE NEAR TH E RECTUM.
1999 · 1 incident
WHILE LIFTING FRONT END OF WHEELBARROW, IT SLIPPED CATCHING EE'S THUMB IN THE TIRE ASSEMBLLY. IN THE PROCESS OF MOVING HIS HAND BACK, HE TWISTED HIS LOWER BACK. A TRIP TO MEDICAL INDICATED HIS THUMB WAS BROKEN. HIS THUMB WAS OPERATED ON FORA CHIP AND HE IS RECEIVING CHIROPRACTIC TREATMENT FOR HIS BACK. OPERATION 0N 4/23 WAS ONLY DAY OF WORK MISSED.
1997 · 1 incident
EMPLOYEE WAS INSTALLING SHEAVES ON CONVEYOR DRIVE, WORKING OFF OF 10' LADDER SLIPPED OUT FROM UNDER HIM AND HE FELL INJURING HIS WRIST.