Data / Mines / Wyoming / Mills Plant
Mills Plant, Natrona County, Wyoming: 54 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Mills Plant is an active bentonite processing facility in Natrona County, Wyoming, operated by Black Hills Bentonite-A Limited Liability Co with 20 employees on MSHA's record (mine ID 4800617). Since January 1, 2022 MSHA inspectors issued 54 citations and orders there with $22,595 in proposed penalties, and 5 accident reports were filed there, with 5 injury or illness cases.
The request: Watch Mills Plant (MSHA mine ID 4800617) in Natrona County, Wyoming: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 4800617
- Status
- Active since October 26, 1990
- Main commodity
- Bentonite
- Mine type
- Facility
- County
- Natrona County, Wyoming
- Nearest town
- Mills
- Operator
- Black Hills Bentonite-A Limited Liability Co
- Employees
- 20
- MSHA field office
- Gillette WY Field Office
- Citations and orders since January 1, 2022
- 54
- Significant and substantial
- 8 (14.8%)
- Closure orders
- 0
- High negligence or reckless
- 2
- Proposed penalties
- $22,595
- Amount paid so far
- $18,913
- Inspections
- 14
- Inspector hours on site
- 114
- Citations per inspection
- 3.86 (all mines 2.30)
- Accident reports
- 5
- Injury and illness cases
- 5
- Fatalities
- 0
- Latest MSHA record
- August 7, 2026
- Citations issued to contractors here
- 3 ($429 proposed)
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 6 | 2 | $7,563 | 1 |
| 2023 | 12 | 2 | $1,972 | 2 |
| 2024 | 26 | 3 | $8,643 | 1 |
| 2025 | 5 | 0 | $2,930 | 1 |
| 2026 | 5 | 1 | $1,487 | 0 |
Standards cited most at Mills Plant
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4430 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14206 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16009 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16006 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12016 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Mills Plant
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 4 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Mills Plant describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 3 |
| Powered haulage | 1 |
| Handling of materials | 1 |
Equipment named in accident reports at Mills Plant
| Equipment | Reports |
|---|---|
| Mine car | 1 |
Other open mines in Natrona County, Wyoming
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Tolsa Wyoming Bentonite Plant | Tolsa Wyoming Bentonite Corp. | Natrona County, WY | Bentonite | 8 | 85 |
| Casper Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 12 | 30 |
| HT Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 10 | 18 |
| Crusher #7 | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 2 | 16 |
| Fold & Go Screen | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 2 | 11 |
| Advanced Screenplant | 71 Construction | Natrona County, WY | Construction sand and gravel | 2 | 11 |
| Cedarapids Screen | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 2 | 7 |
| El Jay | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 6 |
| Crusher #4 | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 3 | 5 |
| Jci K200-6203CC | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 5 |
| Screen #3 | Brutill Construction, Inc | Natrona County, WY | Construction sand and gravel | 3 | 4 |
| Oftedal Crusher #1 | E H Oftedal & Sons Inc | Natrona County, WY | Gypsum | 2 | 4 |
| Portable Screening Plant | Mobile Concrete Inc | Natrona County, WY | Construction sand and gravel | 3 | 1 |
| Casper Pit | JTL Group, Inc. | Natrona County, WY | Construction sand and gravel | 2 | 1 |
| Crusher #6 | JTL Group, Inc. | Natrona County, WY | Crushed, broken limestone | 2 | 0 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.