Project Facts

The TMM Project is based on an underground mine plan focused on the Maturi mineral deposit in northeastern Minnesota. The TMM project will process approximately 20,000 tons of mineralized ore per day, producing marketable concentrates.

Copper, nickel, platinum, palladium, gold and silver – metals of strategic importance to the U.S. economy and national defense – are the focus of this project.

Location: The TMM Project is based on an underground mine plan targeting the Maturi mineral deposit. The Maturi deposit is located outside the Boundary Waters and is approximately nine miles southeast of the city of Ely, Minnesota, and 11 miles northeast of the city of Babbitt, Minnesota.

Jobs: Once operational, the TMM Project will create approximately 650 direct full-time jobs and an additional 1,300 jobs in industries such as equipment supplies, manufacturing, retail, healthcare, automotive and more.

Underground Mine: Underground mining operations allow for maximizing underground storage of waste rock and tailings, minimizing the impacts of mining activities. When in production, all waste rock generated from underground mining activity will be used as underground backfill, meaning there will be no permanent waste rock piles. Additionally, half of the tailings produced by the concentrator in the processing of mineralized ore will be returned to the underground mine as permanent cemented backfill, and the remaining tailings will be stored in a modern, lined surface storage facility.

Tailings Storage Facility (TSF): Approximately half of the tailings will be stored as permanent cemented backfill in the underground mine. The remaining tailings will be stored in the modern, lined surface tailings storage facility (TSF). TMM intends to propose the TSF near an existing mine southwest of the city of Babbitt, Minnesota, and outside the Rainy River drainage. Testing shows the tailings will be non-acid generating.

Twin Metals has been conducting environmental studies for more than five years – and these efforts will be ongoing. Environmental information from in and around Twin Metals Minnesota’s land and mineral assets will feed into the formal, Environmental Impact Statement (EIS) that will be developed by state and federal agencies. Today’s environmental regulations tightly restrict how mines are designed and operated. State and federal agencies require strict adherence to regulations surrounding key environmental issues, including surface water and groundwater quality, threatened and endangered species, air quality, plant life and wetlands to name a few.

Dozens of local, state and federal environmental permits will be required to plan, construct and operate the proposed underground mine. State and federal environmental requirements must be met or exceeded, or the TMM Project will not be authorized to move forward.

Twin Metals Minnesota has 15 Minnesota-based employees in two offices. Through its project design activities, Twin Metals has supported as many as 200 consulting/contractor positions and additional spinoff jobs.

The Twin Metals Minnesota project will create approximately 650 long-term mining jobs and 1,300 indirect spinoff jobs in other industries. The three year construction phase of the TMM project will require several million labor hours for construction trades and other professions, which is on par with or greater than the tremendous job creation for construction projects in the Twin Cities, such as U.S. Bank Stadium and Target Field. Read More.

Average mining wages and benefits significantly outpace other industries in Minnesota.

According to the U.S. Bureau of Labor Statistics, the average annual wage for a Minnesota mining job in 2015 was $78,635, more than 45 percent greater than the average for all industries. Mining offers living wages that can support families, send children to college, provide for retirement and build local communities. Read More.

More than $400 million has been invested in exploration and project development to date. Based on current plans being studied, more than $1.2 billion will be invested in further design and construction for the TMM underground mine project. Read More.

The TMM Project will generate significant tax and royalty revenue for state and local governments as well as the education of nearly 900,000 K-12 students statewide. Read More.