Data / Mines / Wyoming / Sweetwater County
Mines in Sweetwater County, Wyoming: 15 open mines
MSHA lists 15 open mines in Sweetwater County, Wyoming, run by 12 operators and employing 2,489 people. Since January 1, 2022 its inspectors issued 2,874 citations and orders there with $1,706,628 in proposed penalties, and operators reported 199 injury or illness cases, 1 of them fatal. The operators with the most open mines are Searle Brothers Construction Company; Sunroc Corporation; We Soda Alkali, LLC. Data from MSHA, November 6, 2026.
SpecStream is the live web data engine for teams and agents. It reads the mine, citation, inspection and accident files that MSHA publishes, and this page is that reading. Ask for the mines of a commodity, state or operator with the operator's headquarters, website and size added from the web, and new mines, new citations and new accident reports arrive in your sheet, CRM, Slack or agent as MSHA posts them.
- Open mines
- 15
- Operators
- 12
- Employees
- 2,489
- Active
- 10
- Intermittent
- 5
- Citations and orders since January 1, 2022
- 2,874
- Significant and substantial
- 306 (10.6%)
- Closure orders
- 18
- High negligence or reckless
- 140
- Proposed penalties
- $1,706,628
- Amount paid so far
- $1,370,441
- Inspections
- 1,596
- Inspector hours on site
- 23,771
- Citations per inspection
- 1.80 (all mines 2.30)
- Accident reports
- 259
- Injury and illness cases
- 199
- Fatalities
- 1
- Latest MSHA record
- November 5, 2026
Operators with the most open mines in Sweetwater 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 |
|---|---|---|---|---|---|
| Searle Brothers Construction Company | 3 | 7 | 9 | $1,349 | 0 |
| Sunroc Corporation | 2 | 7 | 26 | $4,263 | 1 |
| We Soda Alkali, LLC | 1 | 815 | 996 | $875,599 | 89 |
| American Soda LLC | 1 | 449 | 804 | $396,226 | 41 |
| Tata Chemicals Soda Ash Partners LLC | 1 | 539 | 626 | $287,540 | 38 |
| Sisecam Wyoming, LLC | 1 | 437 | 345 | $122,741 | 11 |
| Black Butte Coal Company | 1 | 59 | 23 | $8,022 | 6 |
| Arizona Materials | 1 | 9 | 18 | $4,165 | 1 |
| Bridger Coal Company | 1 | 160 | 16 | $4,895 | 12 |
| H. B. Lee Construction Co., Inc. | 1 | 2 | 8 | $1,178 | 0 |
| Lee Sand and Gravel, Inc | 1 | 2 | 3 | $650 | 0 |
| Plattoga Holdings, LLC | 1 | 3 | 0 | $0 | 0 |
Operators with the most citations in Sweetwater 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 |
|---|---|---|---|---|---|
| We Soda Alkali, LLC | 1 | 815 | 996 | $875,599 | 89 |
| American Soda LLC | 1 | 449 | 804 | $396,226 | 41 |
| Tata Chemicals Soda Ash Partners LLC | 1 | 539 | 626 | $287,540 | 38 |
| Sisecam Wyoming, LLC | 1 | 437 | 345 | $122,741 | 11 |
| Sunroc Corporation | 2 | 7 | 26 | $4,263 | 1 |
| Black Butte Coal Company | 1 | 59 | 23 | $8,022 | 6 |
| Arizona Materials | 1 | 9 | 18 | $4,165 | 1 |
| Bridger Coal Company | 1 | 160 | 16 | $4,895 | 12 |
| Searle Brothers Construction Company | 3 | 7 | 9 | $1,349 | 0 |
| H. B. Lee Construction Co., Inc. | 1 | 2 | 8 | $1,178 | 0 |
| Lee Sand and Gravel, Inc | 1 | 2 | 3 | $650 | 0 |
| Plattoga Holdings, LLC | 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 |
|---|---|---|---|---|---|
| We Soda @ Westvaco | We Soda Alkali, LLC | Sweetwater County, WY | Trona | 815 | 996 |
| American Soda LLC | American Soda LLC | Sweetwater County, WY | Trona | 449 | 804 |
| Tata Chemicals Mine | Tata Chemicals Soda Ash Partners LLC | Sweetwater County, WY | Trona | 539 | 626 |
| Big Island Mine & Refinery | Sisecam Wyoming, LLC | Sweetwater County, WY | Trona | 437 | 345 |
| Black Butte And Leucite Hills Mines | Black Butte Coal Company | Sweetwater County, WY | Coal (bituminous) | 59 | 23 |
| Portable Crusher Unit F | Arizona Materials | Sweetwater County, WY | Construction sand and gravel | 9 | 18 |
| Pioneer Trails Pit #565 | Sunroc Corporation | Sweetwater County, WY | Construction sand and gravel | 4 | 17 |
| Jim Bridger Mine | Bridger Coal Company | Sweetwater County, WY | Coal (bituminous) | 160 | 16 |
| Mobile Crusher, 76-4034 | Sunroc Corporation | Sweetwater County, WY | Construction sand and gravel | 3 | 9 |
| 2001 BL Pegson Crusher | H. B. Lee Construction Co., Inc. | Sweetwater County, WY | Construction sand and gravel | 2 | 8 |
| Leucite Mine #11 | Searle Brothers Construction Company | Sweetwater County, WY | Crushed, broken stone | 2 | 7 |
| 2004 Chieftan Screener | Lee Sand and Gravel, Inc | Sweetwater County, WY | Construction sand and gravel | 2 | 3 |
| Kolberg 271B | Searle Brothers Construction Company | Sweetwater County, WY | Construction sand and gravel | 3 | 2 |
| Plattoga Pit | Plattoga Holdings, LLC | Sweetwater County, WY | Construction sand and gravel | 3 | 0 |
| 2016 Metso Nordbert C120 Jaw Crusher Pla | Searle Brothers Construction Company | Sweetwater County, WY | Construction sand and gravel | 2 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 8 | 53.3% |
| Trona | 4 | 26.7% |
| Coal (bituminous) | 2 | 13.3% |
| Crushed, broken stone | 1 | 6.7% |
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 | 609 | 78 | $420,335 | 38 |
| 2023 | 526 | 50 | $246,075 | 47 |
| 2024 | 755 | 75 | $529,722 | 39 |
| 2025 | 599 | 65 | $367,289 | 45 |
| 2026 | 385 | 38 | $143,207 | 30 |
Standards cited most at mines in Sweetwater 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 57.20003 | Underground metal and nonmetal mines | 274 |
| 30 CFR 57.14100 | Underground metal and nonmetal mines | 197 |
| 30 CFR 57.4201 | Underground metal and nonmetal mines | 176 |
| 30 CFR 57.12004 | Underground metal and nonmetal mines | 169 |
| 30 CFR 57.14112 | Underground metal and nonmetal mines | 149 |
| 30 CFR 57.14107 | Underground metal and nonmetal mines | 133 |
| 30 CFR 57.12028 | Underground metal and nonmetal mines | 128 |
| 30 CFR 57.12032 | Underground metal and nonmetal mines | 126 |
| 30 CFR 47.41 | Hazard communication | 125 |
| 30 CFR 57.11001 | Underground metal and nonmetal mines | 83 |
| 30 CFR 57.12018 | Underground metal and nonmetal mines | 70 |
| 30 CFR 57.4102 | Underground metal and nonmetal mines | 61 |
| 30 CFR 57.22305 | Underground metal and nonmetal mines | 51 |
| 30 CFR 57.14207 | Underground metal and nonmetal mines | 44 |
| 30 CFR 57.12008 | Underground metal and nonmetal mines | 42 |
Injury and illness cases at mines in Sweetwater County, Wyoming
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Permanent disability | 1 |
| Days away from work or restricted activity | 135 |
| No lost time, or an occupational illness | 62 |
What the accident reports at mines in Sweetwater County, Wyoming describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 85 |
| Slip or fall of person | 46 |
| Machinery | 27 |
| Hoisting | 23 |
| Fall of roof or back | 22 |
| Handtools (nonpowered) | 12 |
| Powered haulage | 10 |
| Entrapment | 7 |
| Fire | 6 |
| Other | 5 |
Equipment named in accident reports at mines in Sweetwater County, Wyoming
| Equipment | Reports |
|---|---|
| Elevator | 30 |
| Hand tools (not powered) | 12 |
| Hand tools (powered) | 7 |
| Welding machine | 4 |
| Forklift | 4 |
| Rock or roof bolting machine | 4 |
| Mancar | 3 |
| Front-end loader | 2 |
| Pump | 2 |
| Hoist | 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.