American Soda LLC, Green River soda ash plant
Large load · 400 COUNTY ROAD 85, Green River, WY
American Soda LLC runs a trona-based soda ash plant at 400 County Road 85 in Green River, Sweetwater County, Wyoming. Uranium Royalty Corp. says production at the Green River Basin operation began in 1979 and that current annual production is 2.6 to 2.8 million tons. A Sweetwater Now article citing the Wyoming State Inspector of Mines' 2025 annual report counts American Soda among the four trona mines currently operating in the county, and describes it as Solvay's. The EPA's record for the plant carries PSD permit PSD-WY-000004-2012 for the Solvay Soda Ash Joint Venture Green River plant, and a July 2025 ISO 9001 certificate covers American Soda LLC's production of soda ash, sodium bicarbonate and trona products.
Overview
Uranium Royalty's project summary says production at the American Soda operation commenced in 1979 and that the current annual production is 2.6 to 2.8 million tons per year. The asset is listed as an existing royalty with an 8 percent PR royalty, a conventional mining method and an In Production stage. The company's ISO 9001 certificate, effective July 9, 2025, covers production of soda ash, sodium bicarbonate and trona products at the Green River address. Together these sources describe an established trona operation with a 2025 capacity addition.
Profile
- 2025 expansion and proposed solution mining
- Uranium Royalty says American Soda completed an approximately 600,000 tons per annum production capacity expansion in the third quarter of 2025. The same summary says the company has proposed a solution mining expansion to raise capacity further, but that detailed operating parameters and development plans have not been publicly disclosed. The 2025 addition is therefore the most recent documented change to the plant's production capacity, and the solution mining proposal is the main open item for future output at the Green River site.
- Permit history and Wyoming trona context
- The EPA's record for the Green River plant describes a final prevention of significant deterioration permit, PSD-WY-000004-2012, issued for the Solvay Soda Ash Joint Venture Green River Soda Ash Plant. The Wyoming State Inspector of Mines' 2025 annual report, as reported by Sweetwater Now, lists four trona mines operating in Sweetwater County, among them Solvay's American Soda mine, alongside Sisecam Wyoming, Tata Chemicals (Soda Ash) Partners and We Soda. That count places the Green River plant among the county's main soda ash producers.
Facility
- Activity
- Soda ash, sodium bicarbonate and trona production
- Industry
- Manufacturing
- Site type
- Facility
- Operating status
- Operating
Related records
Timeline
- Jul 9, 2025
- ISO 9001 certificate for American Soda LLC production at Green River took effect.
www.solvay.com
- Sep 30, 2025
- American Soda completed an approximately 600,000 tons per annum capacity expansion in the third quarter of 2025.
Uranium Royalty Corp. - American Soda<sup>(15)</sup>