Data / Mines / Wyoming / Campbell County
Mines in Campbell County, Wyoming: 27 open mines
MSHA lists 27 open mines in Campbell County, Wyoming, run by 17 operators and employing 2,926 people. Since January 1, 2022 its inspectors issued 2,036 citations and orders there with $1,825,031 in proposed penalties, and operators reported 226 injury or illness cases. The operators with the most open mines are Melgaard Construction Company Inc.; Thunder Basin Coal Company LLC; Eagle Specialty Materials LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 27
- Operators
- 17
- Employees
- 2,926
- Active
- 12
- Temporarily Idled
- 10
- Intermittent
- 4
- New Mine
- 1
- Mines run by individuals, counted and not listed
- 3
- Citations and orders since January 1, 2022
- 2,036
- Significant and substantial
- 288 (14.1%)
- Closure orders
- 18
- High negligence or reckless
- 104
- Proposed penalties
- $1,825,031
- Amount paid so far
- $1,431,451
- Inspections
- 346
- Inspector hours on site
- 16,421
- Citations per inspection
- 5.88 (all mines 2.30)
- Accident reports
- 335
- Injury and illness cases
- 226
- Fatalities
- 0
- Latest MSHA record
- November 4, 2026
Operators with the most open mines in Campbell 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 |
|---|---|---|---|---|---|
| Melgaard Construction Company Inc. | 6 | 22 | 26 | $4,037 | 0 |
| Thunder Basin Coal Company LLC | 2 | 444 | 465 | $402,022 | 52 |
| Eagle Specialty Materials LLC | 2 | 472 | 326 | $204,650 | 35 |
| Peabody Caballo Mining, LLC | 2 | 276 | 251 | $117,873 | 21 |
| Quality Agg & Construction Inc | 2 | 4 | 4 | $698 | 0 |
| Peabody Powder River Mining LLC | 1 | 1,207 | 593 | $824,449 | 86 |
| Buckskin Mining Company | 1 | 120 | 130 | $114,930 | 8 |
| Navajo Transitional Energy Company, LLC | 1 | 215 | 79 | $54,320 | 13 |
| Black Hills Energy | 1 | 53 | 45 | $13,606 | 4 |
| Western Fuels-Wyoming Inc | 1 | 67 | 14 | $4,699 | 2 |
| Campbell County Road & Bridge Department | 1 | 0 | 4 | $542 | 0 |
| The Stone Yard, LLC | 1 | 2 | 1 | $151 | 0 |
| Earth Work Solutions (WY) | 1 | 3 | 0 | $0 | 0 |
| FireSteel Well Service Inc. | 1 | 2 | 0 | $0 | 0 |
| Green Bridge Holdings, Inc. | 1 | 0 | 0 | $0 | 0 |
Operators with the most citations in Campbell 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 |
|---|---|---|---|---|---|
| Peabody Powder River Mining LLC | 1 | 1,207 | 593 | $824,449 | 86 |
| Thunder Basin Coal Company LLC | 2 | 444 | 465 | $402,022 | 52 |
| Eagle Specialty Materials LLC | 2 | 472 | 326 | $204,650 | 35 |
| Peabody Caballo Mining, LLC | 2 | 276 | 251 | $117,873 | 21 |
| Buckskin Mining Company | 1 | 120 | 130 | $114,930 | 8 |
| Navajo Transitional Energy Company, LLC | 1 | 215 | 79 | $54,320 | 13 |
| Black Hills Energy | 1 | 53 | 45 | $13,606 | 4 |
| Melgaard Construction Company Inc. | 6 | 22 | 26 | $4,037 | 0 |
| Western Fuels-Wyoming Inc | 1 | 67 | 14 | $4,699 | 2 |
| Quality Agg & Construction Inc | 2 | 4 | 4 | $698 | 0 |
| Campbell County Road & Bridge Department | 1 | 0 | 4 | $542 | 0 |
| The Stone Yard, LLC | 1 | 2 | 1 | $151 | 0 |
| Earth Work Solutions (WY) | 1 | 3 | 0 | $0 | 0 |
| FireSteel Well Service Inc. | 1 | 2 | 0 | $0 | 0 |
| Green Bridge Holdings, Inc. | 1 | 0 | 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 |
|---|---|---|---|---|---|
| North Antelope Rochelle Mine | Peabody Powder River Mining LLC | Campbell County, WY | Coal (bituminous) | 1,207 | 593 |
| Black Thunder | Thunder Basin Coal Company LLC | Campbell County, WY | Coal (bituminous) | 408 | 394 |
| Belle Ayr Mine | Eagle Specialty Materials LLC | Campbell County, WY | Coal (bituminous) | 240 | 207 |
| Caballo Mine | Peabody Caballo Mining, LLC | Campbell County, WY | Coal (bituminous) | 163 | 131 |
| Buckskin Mine | Buckskin Mining Company | Campbell County, WY | Coal (bituminous) | 120 | 130 |
| Rawhide Mine | Peabody Caballo Mining, LLC | Campbell County, WY | Coal (bituminous) | 113 | 120 |
| Eagle Butte Mine | Eagle Specialty Materials LLC | Campbell County, WY | Coal (bituminous) | 232 | 119 |
| Cordero Rojo Mine | Navajo Transitional Energy Company, LLC | Campbell County, WY | Coal (bituminous) | 215 | 79 |
| Coal Creek Mine | Thunder Basin Coal Company LLC | Campbell County, WY | Coal (bituminous) | 36 | 71 |
| Wyodak Mine | Black Hills Energy | Campbell County, WY | Coal (bituminous) | 53 | 45 |
| Dry Fork Mine | Western Fuels-Wyoming Inc | Campbell County, WY | Coal (bituminous) | 67 | 14 |
| 2019 Lippmann 4800 Impactor | Melgaard Construction Company Inc. | Campbell County, WY | Construction sand and gravel | 5 | 10 |
| 2003 Cedar Rapids Electric Jaw | Melgaard Construction Company Inc. | Campbell County, WY | Construction sand and gravel | 5 | 8 |
| 2003 Cedar Rapids Cone Crusher | Melgaard Construction Company Inc. | Campbell County, WY | Construction sand and gravel | 4 | 6 |
| Qac #1 | Quality Agg & Construction Inc | Campbell County, WY | Construction sand and gravel | 4 | 4 |
| Campbell County Crusher | Campbell County Road & Bridge Department | Campbell County, WY | Construction sand and gravel | 0 | 4 |
| Astec 2512K Fold & Go SP001 093075 | Melgaard Construction Company Inc. | Campbell County, WY | Construction sand and gravel | 4 | 2 |
| Stone Yard #2 | The Stone Yard, LLC | Campbell County, WY | Construction sand and gravel | 2 | 1 |
| 2004 Cedar Rapids Impactor | Melgaard Construction Company Inc. | Campbell County, WY | Construction sand and gravel | 4 | 0 |
| State 36 | Earth Work Solutions (WY) | Campbell County, WY | Construction sand and gravel | 3 | 0 |
| Pickrel #2 | FireSteel Well Service Inc. | Campbell County, WY | Crushed, broken stone | 2 | 0 |
| Synthetic Fuels | Green Bridge Holdings, Inc. | Campbell County, WY | Coal (bituminous) | 0 | 0 |
| Jig Plant | Melgaard Construction Company Inc. | Campbell County, WY | Sand, common | 0 | 0 |
| Qac Screening Plant | Quality Agg & Construction Inc | Campbell County, WY | Sand, common | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Coal (bituminous) | 12 | 44.4% |
| Construction sand and gravel | 10 | 37% |
| Sand, common | 2 | 7.4% |
| Crushed, broken stone | 2 | 7.4% |
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 | 433 | 72 | $335,521 | 42 |
| 2023 | 537 | 67 | $452,738 | 63 |
| 2024 | 422 | 56 | $563,994 | 49 |
| 2025 | 378 | 55 | $328,562 | 33 |
| 2026 | 266 | 38 | $144,216 | 39 |
Standards cited most at mines in Campbell 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 77.1104 | Surface coal mines, safety | 203 |
| 30 CFR 77.502 | Surface coal mines, safety | 173 |
| 30 CFR 77.404 | Surface coal mines, safety | 150 |
| 30 CFR 77.1110 | Surface coal mines, safety | 136 |
| 30 CFR 77.1605 | Surface coal mines, safety | 114 |
| 30 CFR 77.1607 | Surface coal mines, safety | 94 |
| 30 CFR 77.1606 | Surface coal mines, safety | 89 |
| 30 CFR 77.512 | Surface coal mines, safety | 67 |
| 30 CFR 77.410 | Surface coal mines, safety | 65 |
| 30 CFR 77.502-2 | Surface coal mines, safety | 64 |
| 30 CFR 77.400 | Surface coal mines, safety | 55 |
| 30 CFR 77.505 | Surface coal mines, safety | 50 |
| 30 CFR 77.516 | Surface coal mines, safety | 47 |
| 30 CFR 77.205 | Surface coal mines, safety | 37 |
| 30 CFR 77.1101 | Surface coal mines, safety | 30 |
Injury and illness cases at mines in Campbell County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 4 |
| Days away from work or restricted activity | 130 |
| No lost time, or an occupational illness | 92 |
What the accident reports at mines in Campbell County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Fire | 97 |
| Handling of materials | 73 |
| Slip or fall of person | 56 |
| Powered haulage | 28 |
| Machinery | 25 |
| Other | 21 |
| Handtools (nonpowered) | 13 |
| All other occupational illnesses | 5 |
| Disorders (repeated trauma) | 4 |
| Stepping or kneeling on object | 3 |
Equipment named in accident reports at mines in Campbell County, Wyoming
| Equipment | Reports |
|---|---|
| Ore haulage trucks - off highway trucks | 26 |
| Shovel | 15 |
| Bulldozer | 12 |
| Hand tools (not powered) | 12 |
| Hand tools (powered) | 10 |
| Trucks | 8 |
| Road grader | 4 |
| Mancar | 4 |
| Front-end loader | 3 |
| Tugger | 2 |
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.