Data / Mines / Wyoming / Big Horn County
Mines in Big Horn County, Wyoming: 19 open mines
MSHA lists 19 open mines in Big Horn County, Wyoming, run by 12 operators and employing 326 people. Since January 1, 2022 its inspectors issued 232 citations and orders there with $80,435 in proposed penalties, and operators reported 33 injury or illness cases. The operators with the most open mines are Wyo-Ben, Inc; American Colloid Company Mineral Group; Frost Rock Products Company. Data from MSHA, November 6, 2026.
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- Open mines
- 19
- Operators
- 12
- Employees
- 326
- Active
- 10
- Intermittent
- 5
- Temporarily Idled
- 4
- Citations and orders since January 1, 2022
- 232
- Significant and substantial
- 46 (19.8%)
- Closure orders
- 2
- High negligence or reckless
- 13
- Proposed penalties
- $80,435
- Amount paid so far
- $74,384
- Inspections
- 164
- Inspector hours on site
- 1,251
- Citations per inspection
- 1.41 (all mines 2.30)
- Accident reports
- 34
- Injury and illness cases
- 33
- Fatalities
- 0
- Latest MSHA record
- November 5, 2026
Operators with the most open mines in Big Horn County, Wyoming
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Wyo-Ben, Inc | 5 | 131 | 77 | $14,384 | 25 |
| American Colloid Company Mineral Group | 2 | 58 | 52 | $27,295 | 4 |
| Frost Rock Products Company | 2 | 5 | 33 | $8,186 | 0 |
| Bentonite Performance Minerals, LLC | 2 | 85 | 28 | $4,740 | 2 |
| Mountain Construction Company | 1 | 13 | 21 | $21,925 | 1 |
| Georgia-Pacific Gypsum LLC | 1 | 17 | 14 | $2,864 | 1 |
| 3J Trucking LLC | 1 | 4 | 5 | $757 | 0 |
| Big Horn Redi-Mix Inc | 1 | 4 | 1 | $151 | 0 |
| River Rock, LLC | 1 | 1 | 1 | $133 | 0 |
| Bairco Construction Inc. | 1 | 3 | 0 | $0 | 0 |
| GK Construction Inc. | 1 | 2 | 0 | $0 | 0 |
| Highland Excavation & Construction, Inc. | 1 | 3 | 0 | $0 | 0 |
Operators with the most citations in Big Horn County, Wyoming
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Wyo-Ben, Inc | 5 | 131 | 77 | $14,384 | 25 |
| American Colloid Company Mineral Group | 2 | 58 | 52 | $27,295 | 4 |
| Frost Rock Products Company | 2 | 5 | 33 | $8,186 | 0 |
| Bentonite Performance Minerals, LLC | 2 | 85 | 28 | $4,740 | 2 |
| Mountain Construction Company | 1 | 13 | 21 | $21,925 | 1 |
| Georgia-Pacific Gypsum LLC | 1 | 17 | 14 | $2,864 | 1 |
| 3J Trucking LLC | 1 | 4 | 5 | $757 | 0 |
| Big Horn Redi-Mix Inc | 1 | 4 | 1 | $151 | 0 |
| River Rock, LLC | 1 | 1 | 1 | $133 | 0 |
| Bairco Construction Inc. | 1 | 3 | 0 | $0 | 0 |
| GK Construction Inc. | 1 | 2 | 0 | $0 | 0 |
| Highland Excavation & Construction, Inc. | 1 | 3 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Lovell Mill | American Colloid Company Mineral Group | Big Horn County, WY | Bentonite | 44 | 52 |
| Magnet Cove Mill | Wyo-Ben, Inc | Big Horn County, WY | Bentonite | 36 | 35 |
| Crusher #1 | Frost Rock Products Company | Big Horn County, WY | Construction sand and gravel | 3 | 33 |
| BPM Lovell Mill | Bentonite Performance Minerals, LLC | Big Horn County, WY | Bentonite | 62 | 27 |
| Portable #1 | Mountain Construction Company | Big Horn County, WY | Construction sand and gravel | 13 | 21 |
| Stucco Mill | Wyo-Ben, Inc | Big Horn County, WY | Bentonite | 30 | 16 |
| G-P Gypsum Quarries | Georgia-Pacific Gypsum LLC | Big Horn County, WY | Gypsum | 17 | 14 |
| Sage Creek Mill | Wyo-Ben, Inc | Big Horn County, WY | Bentonite | 17 | 13 |
| Magnet Cove Mine | Wyo-Ben, Inc | Big Horn County, WY | Bentonite | 37 | 11 |
| 3J Crushing Plant | 3J Trucking LLC | Big Horn County, WY | Construction sand and gravel | 4 | 5 |
| Big Horn Basin Mines | Wyo-Ben, Inc | Big Horn County, WY | Bentonite | 11 | 2 |
| BPM Lovell Mine | Bentonite Performance Minerals, LLC | Big Horn County, WY | Bentonite | 23 | 1 |
| Molnar Pit | Big Horn Redi-Mix Inc | Big Horn County, WY | Construction sand and gravel | 4 | 1 |
| Capwood Properties | River Rock, LLC | Big Horn County, WY | Construction sand and gravel | 1 | 1 |
| Yellowtail Mine | American Colloid Company Mineral Group | Big Horn County, WY | Bentonite | 14 | 0 |
| Highland Excavation Pit | Highland Excavation & Construction, Inc. | Big Horn County, WY | Construction sand and gravel | 3 | 0 |
| Bairco Mobile Crusher | Bairco Construction Inc. | Big Horn County, WY | Construction sand and gravel | 3 | 0 |
| Crusher #2 | Frost Rock Products Company | Big Horn County, WY | Construction sand and gravel | 2 | 0 |
| GK Gravel Pit | GK Construction Inc. | Big Horn County, WY | Construction sand and gravel | 2 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Bentonite | 9 | 47.4% |
| Construction sand and gravel | 9 | 47.4% |
| Gypsum | 1 | 5.3% |
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 | 60 | 23 | $34,065 | 5 |
| 2023 | 51 | 9 | $17,522 | 8 |
| 2024 | 58 | 8 | $18,882 | 6 |
| 2025 | 37 | 2 | $6,621 | 6 |
| 2026 | 26 | 4 | $3,345 | 8 |
Standards cited most at mines in Big Horn County, Wyoming
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 | 19 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 17 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 16 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 13 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.11027 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.16005 | Surface metal and nonmetal mines | 5 |
| 30 CFR 47.41 | Hazard communication | 5 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 4 |
Injury and illness cases at mines in Big Horn County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 25 |
| No lost time, or an occupational illness | 8 |
What the accident reports at mines in Big Horn County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 13 |
| Handling of materials | 9 |
| Handtools (nonpowered) | 3 |
| Powered haulage | 3 |
| Machinery | 2 |
| Other | 2 |
| Striking or bumping | 2 |
Equipment named in accident reports at mines in Big Horn County, Wyoming
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 3 |
| Crusher | 2 |
| Road grader | 2 |
| Bulldozer | 2 |
| Forklift | 2 |
| Mine car | 1 |
| Trucks | 1 |
| Conveyor | 1 |
| Front-end loader | 1 |
| Packaging machine | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. 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.