Responsible Mining

Responsible mining is compatible with wilderness preservation, just as it has been throughout the more than 130-year history of mining in Minnesota. In fact, Minnesota has long been a world leader in developing and upholding strict regulatory processes for the development of natural resources and modern mining.

Twin Metals Minnesota recognizes environmental conservation as a core value and strives to be a leader in protecting Minnesota’s wilderness, natural environment and recreational resources. Today’s environmental regulations tightly control how mines are designed and operated, and require bankruptcy-proof financial assurance for reclamation and closure performance. The Minnesota Department of Natural Resources, Minnesota Pollution Control Agency, U.S. Environmental Protection Agency and other state and federal agencies will enforce regulations protecting water, soil, animals and air.

Pending a resolution of its federal mineral rights, TMM expects to submit a formal mine plan proposal in the next two years, initiating a rigorous and thorough environmental review by multiple state and federal agencies as required by law.

Some of the agencies with regulatory authority over the Twin Metals Minnesota project include:

  • Minnesota Department of Natural Resources
  • Minnesota Pollution Control Agency
  • Minnesota Department of Health
  • U.S. Environmental Protection Agency
  • U.S. Army Corps of Engineers
  • U.S. Forest Service
  • U.S. Bureau of Land Management

The TMM Project will minimize the surface footprint of mining activity by using underground mining operations coupled with storing half of tailings material as permanent cemented backfill in the underground mine. The remaining tailings will be stored in a modern surface storage facility outside the Rainy River drainage near an existing mining area. All tailings will be non-acid generating and no permanent waste rock piles will be required.