Data / Mines / Wyoming / Johnson County
Mines in Johnson County, Wyoming: 20 open mines
MSHA lists 20 open mines in Johnson County, Wyoming, run by 14 operators and employing 64 people. Since January 1, 2022 its inspectors issued 122 citations and orders there with $26,171 in proposed penalties, and operators reported 11 injury or illness cases. The operators with the most open mines are Kart LLC; Wyoming Construction Materials; Carlat Construction, Inc.. Data from MSHA, November 6, 2026.
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- Open mines
- 20
- Operators
- 14
- Employees
- 64
- Temporarily Idled
- 13
- Intermittent
- 7
- Citations and orders since January 1, 2022
- 122
- Significant and substantial
- 21 (17.2%)
- Closure orders
- 1
- High negligence or reckless
- 15
- Proposed penalties
- $26,171
- Amount paid so far
- $25,626
- Inspections
- 111
- Inspector hours on site
- 587
- Citations per inspection
- 1.10 (all mines 2.30)
- Accident reports
- 11
- Injury and illness cases
- 11
- Fatalities
- 0
- Latest MSHA record
- October 14, 2026
Operators with the most open mines in Johnson 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 |
|---|---|---|---|---|---|
| Kart LLC | 3 | 6 | 2 | $298 | 0 |
| Wyoming Construction Materials | 2 | 4 | 15 | $2,973 | 0 |
| Carlat Construction, Inc. | 2 | 4 | 13 | $1,887 | 1 |
| Mullinax Inc | 2 | 8 | 13 | $2,913 | 1 |
| Prism Logistics, LLC | 2 | 4 | 5 | $1,173 | 0 |
| Black Hills Bentonite-A Limited Liability Co | 1 | 13 | 33 | $8,739 | 8 |
| Croell, Inc. | 1 | 5 | 20 | $3,552 | 0 |
| The Stone Yard, LLC | 1 | 3 | 14 | $3,587 | 0 |
| Fisher Sand & Gravel Company | 1 | 6 | 3 | $453 | 1 |
| Powder River Sand and Gravel | 1 | 0 | 2 | $294 | 0 |
| 3R Farm and Ranch, LLC | 1 | 6 | 1 | $151 | 0 |
| Simon Contractors | 1 | 3 | 1 | $151 | 0 |
| Brutill Construction, Inc | 1 | 2 | 0 | $0 | 0 |
| Sussex Sand & Gravel | 1 | 0 | 0 | $0 | 0 |
Operators with the most citations in Johnson 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 |
|---|---|---|---|---|---|
| Black Hills Bentonite-A Limited Liability Co | 1 | 13 | 33 | $8,739 | 8 |
| Croell, Inc. | 1 | 5 | 20 | $3,552 | 0 |
| Wyoming Construction Materials | 2 | 4 | 15 | $2,973 | 0 |
| The Stone Yard, LLC | 1 | 3 | 14 | $3,587 | 0 |
| Carlat Construction, Inc. | 2 | 4 | 13 | $1,887 | 1 |
| Mullinax Inc | 2 | 8 | 13 | $2,913 | 1 |
| Prism Logistics, LLC | 2 | 4 | 5 | $1,173 | 0 |
| Fisher Sand & Gravel Company | 1 | 6 | 3 | $453 | 1 |
| Kart LLC | 3 | 6 | 2 | $298 | 0 |
| Powder River Sand and Gravel | 1 | 0 | 2 | $294 | 0 |
| 3R Farm and Ranch, LLC | 1 | 6 | 1 | $151 | 0 |
| Simon Contractors | 1 | 3 | 1 | $151 | 0 |
| Brutill Construction, Inc | 1 | 2 | 0 | $0 | 0 |
| Sussex Sand & Gravel | 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 |
|---|---|---|---|---|---|
| Kaycee Mine | Black Hills Bentonite-A Limited Liability Co | Johnson County, WY | Bentonite | 13 | 33 |
| Wash Plant 5 | Croell, Inc. | Johnson County, WY | Construction sand and gravel | 5 | 20 |
| Quarter Circle 41 Ranch Pit | Wyoming Construction Materials | Johnson County, WY | Construction sand and gravel | 4 | 14 |
| Stone Yard #1 | The Stone Yard, LLC | Johnson County, WY | Construction sand and gravel | 3 | 14 |
| Cross H Pit | Carlat Construction, Inc. | Johnson County, WY | Construction sand and gravel | 2 | 13 |
| Portable Crusher | Mullinax Inc | Johnson County, WY | Construction sand and gravel | 6 | 12 |
| Metso Screening Plant | Prism Logistics, LLC | Johnson County, WY | Construction sand and gravel | 2 | 4 |
| Fisher Industries Plant 42 | Fisher Sand & Gravel Company | Johnson County, WY | Construction sand and gravel | 6 | 3 |
| Fabtech Wash Plant | Powder River Sand and Gravel | Johnson County, WY | Construction sand and gravel | 0 | 2 |
| 3R Pit | 3R Farm and Ranch, LLC | Johnson County, WY | Construction sand and gravel | 6 | 1 |
| T.a. Ranch Pit | Simon Contractors | Johnson County, WY | Construction sand and gravel | 3 | 1 |
| Screen 1 | Kart LLC | Johnson County, WY | Construction sand and gravel | 3 | 1 |
| Crusher 1 Rental | Kart LLC | Johnson County, WY | Construction sand and gravel | 3 | 1 |
| Track Jaw | Prism Logistics, LLC | Johnson County, WY | Construction sand and gravel | 2 | 1 |
| Kennedy | Mullinax Inc | Johnson County, WY | Construction sand and gravel | 2 | 1 |
| WCM Mobile Trommel | Wyoming Construction Materials | Johnson County, WY | Sand, common | 0 | 1 |
| Astec Screening Plant | Carlat Construction, Inc. | Johnson County, WY | Sand, common | 2 | 0 |
| Screen #4 | Brutill Construction, Inc | Johnson County, WY | Bentonite | 2 | 0 |
| Ullery Pit | Sussex Sand & Gravel | Johnson County, WY | Construction sand and gravel | 0 | 0 |
| Hazelton 1- Turnpike | Kart LLC | Johnson County, WY | Construction sand and gravel | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 16 | 80% |
| Bentonite | 2 | 10% |
| Sand, common | 2 | 10% |
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 | 13 | 1 | $1,729 | 1 |
| 2023 | 43 | 10 | $8,966 | 1 |
| 2024 | 30 | 5 | $9,458 | 3 |
| 2025 | 31 | 4 | $5,048 | 2 |
| 2026 | 5 | 1 | $970 | 4 |
Standards cited most at mines in Johnson 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 56.12030 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 7 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 6 |
| 30 CFR 56.1000 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14130 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14206 | Surface metal and nonmetal mines | 3 |
| 30 CFR 46.6 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
Injury and illness cases at mines in Johnson County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 6 |
| No lost time, or an occupational illness | 5 |
What the accident reports at mines in Johnson County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 3 |
| Slip or fall of person | 3 |
| Handtools (nonpowered) | 2 |
| Powered haulage | 2 |
| Machinery | 1 |
Equipment named in accident reports at mines in Johnson County, Wyoming
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 2 |
| Bulldozer | 2 |
| Scraper loader | 2 |
| Conveyor | 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.