The Navajo Nation Council recently voted to oppose a land-swap bill that would allow copper mining in the Tonto National Forest.
The legislation, sponsored by U.S. Rep. Paul Gosar, R-Doney Park, would lift a decades-old mining ban on 2,600 acres of federal forest east of Phoenix.
It would swap the land for 5,000 acres of private land.
Copper prices are at historic highs, and Gosar says a mine near Superior would create 3,700 jobs.
The Navajo Nation has joined the San Carlos Apache Tribe in opposing the bill.