Mills Plant
Active
Facility
Nonmetal
Operator: Black Hills Bentonite
Controller: BHB Limited Partnership; A&M Products
Location: Mills, Natrona County, WY
Employees: 20
273
Violations
96
S&S Violations
68
Accidents
$197K
Penalties
Recent Violations
View all 273 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 12/15/2025 | 56.16005 | Non-S&S | ModNegligence | $288 |
| 12/15/2025 | 56.14115(b) | Non-S&S | LowNegligence | $151 |
| 07/21/2025 | 56.14107(a) | Non-S&S | LowNegligence | $883 |
| 07/21/2025 | 56.14107(a) | Non-S&S | ModNegligence | $1,320 |
| 07/21/2025 | 56.12008 | Non-S&S | ModNegligence | $288 |
| 12/19/2024 | 56.14112(b) | Non-S&S | ModNegligence | $432 |
| 12/19/2024 | 56.4201(a)(2) | Non-S&S | ModNegligence | $432 |
| 12/19/2024 | 56.12028 | Non-S&S | ModNegligence | $288 |
| 07/17/2024 | 56.14107(a) | S&S | ModNegligence | $1,287 |
| 07/17/2024 | 56.11012 | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.11012 | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.20003(a) | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.11012 | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.20003(a) | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.14107(a) | Non-S&S | ModNegligence | $260 |
| 07/17/2024 | 56.11001 | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.14107(a) | Non-S&S | ModNegligence | $260 |
| 07/17/2024 | 56.14112(b) | Non-S&S | ModNegligence | $260 |
| 07/17/2024 | 56.20003(a) | Non-S&S | ModNegligence | $172 |
| 07/17/2024 | 56.20003(a) | Non-S&S | ModNegligence | $172 |
Accidents & Injuries
View all 68 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 05/11/2025 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 5d lost |
| 12/30/2024 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 09/22/2023 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 2d lost |
| 02/12/2023 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 12d lost |
| 08/13/2022 | POWERED HAULAGE | DAYS AWAY FROM WORK ONLY | 71d lost |
| 09/02/2021 | MACHINERY | DAYS AWAY FROM WORK ONLY | 41d lost |
| 12/13/2019 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 11/19/2019 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 08/09/2019 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 06/29/2019 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 97 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 12/14/2025 | 12/16/2025 | 15.00 | 1 |
| 07/15/2025 | 07/23/2025 | 23.25 | 1 |
| 12/19/2024 | 12/19/2024 | 9.75 | 1 |
| 07/16/2024 | 07/29/2024 | 47.25 | 2 |
| 12/18/2023 | 12/18/2023 | 11.75 | 1 |
| 09/19/2023 | 09/19/2023 | 1.00 | 1 |
| 09/18/2023 | 09/19/2023 | 20.50 | 1 |
| 09/08/2023 | 09/15/2023 | 45.00 | 1 |
| 12/11/2022 | 12/14/2022 | 10.50 | 1 |
| 07/19/2022 | 07/25/2022 | 18.00 | 1 |
Mine Details
MSHA Mine ID4800617
Mine TypeFacility
StatusActive
CommodityNonmetal
SIC DescriptionBentonite
Employees20
Days/Week7.0
Hours/Shift12.0
Coordinates42.8494440, -106.3755560
Nearest TownMills
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Frequently Asked Questions
How many MSHA violations does Mills Plant have?
Mills Plant has 273 MSHA violations on record, of which 96 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $197K.
What type of mine is Mills Plant?
Mills Plant is a Facility mine producing Nonmetal, located in Mills, Natrona County, WY. It currently has 20 employees.
Has anyone been injured or killed at Mills Plant?
According to MSHA records, Mills Plant has 68 reported accident/injury records and 0 fatalities on file.
Who operates Mills Plant?
Mills Plant is operated by Black Hills Bentonite and controlled by BHB Limited Partnership; A&M Products. MSHA Mine ID: 4800617.