Data / Mines / Black Hills Bentonite-A Limited Liability Co
Black Hills Bentonite-A Limited Liability Co: MSHA record
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Black Hills Bentonite-A Limited Liability Co (MSHA operator ID L09605) operates 8 open mines with 78 employees in Wyoming, mostly bentonite. Since January 1, 2022 MSHA inspectors issued it 224 citations and orders with $68,438 in proposed penalties, and it reported 41 injury or illness cases. Data from MSHA, November 6, 2026.
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- MSHA operator ID
- L09605
- Open mines
- 8
- Employees at open mines
- 78
- States
- Wyoming
- Citations and orders since January 1, 2022
- 224
- Significant and substantial
- 40 (17.9%)
- Closure orders
- 2
- High negligence or reckless
- 10
- Proposed penalties
- $68,438
- Amount paid so far
- $62,896
- Inspections
- 104
- Inspector hours on site
- 859
- Citations per inspection
- 2.15 (all mines 2.30)
- Accident reports
- 43
- Injury and illness cases
- 41
- Fatalities
- 0
- Latest MSHA record
- October 26, 2026
Open mines of Black Hills Bentonite-A Limited Liability Co
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Mills Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 20 | 54 |
| Kaycee Mine | Black Hills Bentonite-A Limited Liability Co | Johnson County, WY | Bentonite | 13 | 33 |
| Casper Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 12 | 30 |
| Tensleep Mine | Black Hills Bentonite-A Limited Liability Co | Washakie County, WY | Bentonite | 8 | 30 |
| Thornton Plant | Black Hills Bentonite-A Limited Liability Co | Weston County, WY | Bentonite | 1 | 26 |
| Worland Plant | Black Hills Bentonite-A Limited Liability Co | Washakie County, WY | Bentonite | 11 | 22 |
| HT Plant | Black Hills Bentonite-A Limited Liability Co | Natrona County, WY | Bentonite | 10 | 18 |
| Oshoto Mine | Black Hills Bentonite-A Limited Liability Co | Weston County, WY | Bentonite | 3 | 11 |
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 | 43 | 11 | $20,932 | 7 |
| 2023 | 47 | 9 | $10,245 | 11 |
| 2024 | 89 | 15 | $26,296 | 13 |
| 2025 | 25 | 1 | $7,184 | 3 |
| 2026 | 20 | 4 | $3,781 | 7 |
Standards cited most at Black Hills Bentonite-A Limited Liability Co
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 56.14107 | Surface metal and nonmetal mines | 27 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 16 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.11012 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14130 | Surface metal and nonmetal mines | 5 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 5 |
| 30 CFR 46.12 | Training at sand, gravel and surface stone mines | 5 |
Injury and illness cases at Black Hills Bentonite-A Limited Liability Co
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 34 |
| No lost time, or an occupational illness | 7 |
What the accident reports at Black Hills Bentonite-A Limited Liability Co describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 12 |
| Handling of materials | 10 |
| Handtools (nonpowered) | 7 |
| Powered haulage | 7 |
| Machinery | 3 |
| Other | 2 |
| Stepping or kneeling on object | 1 |
| Striking or bumping | 1 |
Equipment named in accident reports at Black Hills Bentonite-A Limited Liability Co
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 7 |
| Scraper loader | 5 |
| Bulldozer | 2 |
| Packaging machine | 2 |
| Conveyor | 1 |
| Fan | 1 |
| Mine car | 1 |
| Ore haulage trucks - off highway trucks | 1 |
Commodities
| Main commodity | Open mines |
|---|---|
| Bentonite | 8 |
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.