Data / Mines / Wyoming / Sheridan County
Mines in Sheridan County, Wyoming: 8 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 8 open mines in Sheridan County, Wyoming, run by 5 operators and employing 18 people. Since January 1, 2022 its inspectors issued 48 citations and orders there with $11,561 in proposed penalties, and operators reported no injury or illness cases. The operators with the most open mines are Wagner Ranch Services, LLC; Mullinax Inc; Tongue River Stone Inc. Data from MSHA, November 6, 2026.
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- Open mines
- 8
- Operators
- 5
- Employees
- 18
- Temporarily Idled
- 3
- Intermittent
- 2
- New Mine
- 2
- NonProducing
- 1
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 48
- Significant and substantial
- 11 (22.9%)
- Closure orders
- 2
- High negligence or reckless
- 9
- Proposed penalties
- $11,561
- Amount paid so far
- $7,456
- Inspections
- 37
- Inspector hours on site
- 208
- Citations per inspection
- 1.30 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- September 11, 2026
Operators with the most open mines in Sheridan 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 |
|---|---|---|---|---|---|
| Wagner Ranch Services, LLC | 2 | 5 | 10 | $1,480 | 0 |
| Mullinax Inc | 2 | 5 | 6 | $1,702 | 0 |
| Tongue River Stone Inc | 1 | 3 | 32 | $8,379 | 0 |
| Brook Mining Company, LLC | 1 | 5 | 0 | $0 | 0 |
| Navajo Transitional Energy Company, LLC | 1 | 0 | 0 | $0 | 0 |
Operators with the most citations in Sheridan 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 |
|---|---|---|---|---|---|
| Tongue River Stone Inc | 1 | 3 | 32 | $8,379 | 0 |
| Wagner Ranch Services, LLC | 2 | 5 | 10 | $1,480 | 0 |
| Mullinax Inc | 2 | 5 | 6 | $1,702 | 0 |
| Brook Mining Company, LLC | 1 | 5 | 0 | $0 | 0 |
| Navajo Transitional Energy Company, LLC | 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 |
|---|---|---|---|---|---|
| Tongue River Stone Inc | Tongue River Stone Inc | Sheridan County, WY | Crushed, broken stone | 3 | 32 |
| Wagner Spread 2 | Wagner Ranch Services, LLC | Sheridan County, WY | Construction sand and gravel | 4 | 8 |
| Portable Crusher 2 | Mullinax Inc | Sheridan County, WY | Construction sand and gravel | 2 | 5 |
| Wagner Spread 3 | Wagner Ranch Services, LLC | Sheridan County, WY | Construction sand and gravel | 1 | 2 |
| Portable #3 | Mullinax Inc | Sheridan County, WY | Construction sand and gravel | 3 | 1 |
| Brook Mine | Brook Mining Company, LLC | Sheridan County, WY | Coal (bituminous) | 5 | 0 |
| Youngs Creek Mine | Navajo Transitional Energy Company, LLC | Sheridan County, WY | Not stated | 0 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 4 | 50% |
| Crushed, broken stone | 1 | 12.5% |
| Coal (bituminous) | 1 | 12.5% |
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 | 6 | 1 | $798 | 0 |
| 2023 | 6 | 2 | $1,264 | 0 |
| 2024 | 15 | 4 | $2,635 | 0 |
| 2025 | 15 | 2 | $5,162 | 0 |
| 2026 | 6 | 2 | $1,702 | 0 |
Standards cited most at mines in Sheridan 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 | 5 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 46.8 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 2 |
| 30 CFR 41.12 | Notice of legal identity | 1 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 1 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4203 | Surface metal and nonmetal mines | 1 |
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.