Data / Mines / Wyoming / Thornton Plant
Thornton Plant, Weston County, Wyoming: 26 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Thornton Plant is an intermittent bentonite surface mine in Weston County, Wyoming, operated by Black Hills Bentonite-A Limited Liability Co with 1 employee on MSHA's record (mine ID 4801042). Since January 1, 2022 MSHA inspectors issued 26 citations and orders there with $5,414 in proposed penalties, and 7 accident reports were filed there, with 6 injury or illness cases.
The request: Watch Thornton Plant (MSHA mine ID 4801042) in Weston County, Wyoming: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 4801042
- Status
- Intermittent since May 14, 2026
- Main commodity
- Bentonite
- Mine type
- Surface
- County
- Weston County, Wyoming
- Nearest town
- Upton
- Operator
- Black Hills Bentonite-A Limited Liability Co
- Employees
- 1
- MSHA field office
- Gillette WY Field Office
- Citations and orders since January 1, 2022
- 26
- Significant and substantial
- 4 (15.4%)
- Closure orders
- 0
- High negligence or reckless
- 2
- Proposed penalties
- $5,414
- Amount paid so far
- $5,414
- Inspections
- 11
- Inspector hours on site
- 85
- Citations per inspection
- 2.36 (all mines 2.30)
- Accident reports
- 7
- Injury and illness cases
- 6
- Fatalities
- 0
- Latest MSHA record
- May 13, 2026
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 | 5 | 1 | $805 | 0 |
| 2023 | 3 | 0 | $429 | 2 |
| 2024 | 12 | 2 | $2,741 | 4 |
| 2025 | 4 | 0 | $1,137 | 0 |
| 2026 | 2 | 1 | $302 | 0 |
Standards cited most at Thornton 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 56.14100 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14200 | Surface metal and nonmetal mines | 1 |
| 30 CFR 47.41 | Hazard communication | 1 |
| 30 CFR 47.44 | Hazard communication | 1 |
| 30 CFR 56.14115 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4230 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.15004 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4603 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 47.42 | Hazard communication | 1 |
| 30 CFR 56.4430 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Thornton Plant
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 5 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Thornton Plant describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 3 |
| Handtools (nonpowered) | 2 |
| Handling of materials | 1 |
| Other | 1 |
Equipment named in accident reports at Thornton Plant
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 2 |
Other open mines in Weston County, Wyoming
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Habeck Gravel Pit | Timberline Aggregates, LLC. | Weston County, WY | Construction sand and gravel | 6 | 14 |
| Oshoto Mine | Black Hills Bentonite-A Limited Liability Co | Weston County, WY | Bentonite | 3 | 11 |
| Wagner Scoria Pit | Wagner Ranch Services, LLC | Weston County, WY | Construction sand and gravel | 3 | 1 |
| Metso Nordberg HP400 Cone Crusher | Wyoming Earthmoving Corporation | Weston County, WY | Agate | 6 | 0 |
| Superbase Screen | Wyoming Earthmoving Corporation | Weston County, WY | Agate | 6 | 0 |
| Fisher Industries Plant 21 | Fisher Sand & Gravel Company | Weston County, WY | Construction sand and gravel | 0 | 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.