Key Takeaway
HT Plant is a active facility mine producing Nonmetal, located in Mills, Natrona County, WY. It has 95 violations on record (20 S&S) and $26K in proposed penalties. Operated by Black Hills Bentonite.
HT Plant
Operator: Black Hills Bentonite
Controller: BHB Limited Partnership; A&M Products
Location: Mills, Natrona County, WY
Employees: 10
Recent Violations
View all 95 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 12/16/2025 | 56.12018 | Non-S&S | ModNegligence | $267 |
| 07/22/2025 | 56.14112(a)(1) | Non-S&S | LowNegligence | $151 |
| 12/17/2024 | 56.14112(b) | Non-S&S | ModNegligence | $151 |
| 12/17/2024 | 56.12028 | Non-S&S | ModNegligence | $151 |
| 12/17/2024 | 56.12028 | Non-S&S | ModNegligence | $151 |
| 07/24/2024 | 56.16005 | Non-S&S | LowNegligence | $147 |
| 07/24/2024 | 56.20003(a) | Non-S&S | ModNegligence | $147 |
| 07/24/2024 | 56.14107(a) | Non-S&S | LowNegligence | $147 |
| 07/24/2024 | 56.14107(a) | S&S | ModNegligence | $260 |
| 07/24/2024 | 56.14107(a) | S&S | LowNegligence | $147 |
| 07/24/2024 | 56.14107(a) | Non-S&S | ModNegligence | $147 |
| 07/24/2024 | 56.14109(b)(1) | Non-S&S | ModNegligence | $147 |
| 12/19/2023 | 56.14101(a)(3) | Non-S&S | ModNegligence | $147 |
| 04/19/2022 | 56.4201(a)(1) | Non-S&S | ModNegligence | $133 |
| 04/19/2022 | 56.14100(b) | Non-S&S | ModNegligence | $133 |
| 03/01/2022 | 56.14206(b) | Non-S&S | ModNegligence | $133 |
| 03/01/2022 | 56.14205 | Non-S&S | ModNegligence | $133 |
| 08/16/2021 | 56.14100(c) | Non-S&S | ModNegligence | $125 |
| 08/16/2021 | 56.11012 | Non-S&S | ModNegligence | $125 |
| 11/23/2020 | 56.14107(a) | Non-S&S | ModNegligence | $123 |
Accidents & Injuries
View all 18 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 08/10/2023 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 31d lost |
| 08/10/2022 | POWERED HAULAGE | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/06/2020 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 30d lost |
| 08/02/2020 | MACHINERY | DAYS AWAY FROM WORK ONLY | 54d lost |
| 07/16/2020 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 6d lost |
| 08/12/2019 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/11/2019 | STRIKING OR BUMPING | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/08/2018 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 38d lost |
| 04/29/2018 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 10/15/2017 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 5d lost |
Inspections
View all 76 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 12/16/2025 | 12/16/2025 | 15.00 | 1 |
| 07/21/2025 | 07/23/2025 | 11.75 | 1 |
| 12/17/2024 | 12/18/2024 | 7.25 | 1 |
| 07/23/2024 | 07/29/2024 | 41.00 | 1 |
| 12/19/2023 | 12/19/2023 | 9.25 | 1 |
| 09/20/2023 | 09/20/2023 | 12.50 | 1 |
| 08/17/2023 | 08/18/2023 | 10.50 | 1 |
| 12/14/2022 | 12/15/2022 | 12.75 | 1 |
| 04/18/2022 | 04/19/2022 | 36.50 | 2 |
| 03/07/2022 | 03/10/2022 | 4.00 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does HT Plant have?
HT Plant has 95 MSHA violations on record, of which 20 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $26K.
What type of mine is HT Plant?
HT Plant is a Facility mine producing Nonmetal, located in Mills, Natrona County, WY. It currently has 10 employees.
Has anyone been injured or killed at HT Plant?
According to MSHA records, HT Plant has 18 reported accident/injury records and 0 fatalities on file.
Who operates HT Plant?
HT Plant is operated by Black Hills Bentonite and controlled by BHB Limited Partnership; A&M Products. MSHA Mine ID: 4801539.