Perpetua Resources has received federal approval to develop its Stibnite Gold Project in Idaho, a critical step toward securing U.S. supplies of antimony and gold.
The project is part of a broader push by the U.S. government to reduce reliance on foreign sources of critical minerals, particularly amid escalating tensions with China.
Once operational, the mine is projected to produce more than 35% of the United States’ annual antimony demand by 2028, as well as approximately 450,000 ounces of gold each year. 
The Biden administration has highlighted antimony as one of several critical minerals essential for national security and the energy transition. The mineral is used in defense systems, electric vehicle batteries, and other advanced technologies.
Located 138 miles north of Boise in Valley County, Idaho, the Stibnite site spans a mix of federal, state, and private land. Mining at the site dates back to 1899, but previous operations left behind significant environmental damage due to a lack of modern regulations.
The U.S. Forest Service granted Perpetua approval to move forward with the project after more than a decade of environmental studies and permitting reviews.
“I have taken into consideration the degree to which the mine’s environmental design features, monitoring, and mitigation measures will, where feasible, minimize adverse environmental impacts on federal lands,” U.S. Forest Service Supervisor Matthew Davis said in a statement.
Environmental concerns remain a major point of contention.
The Idaho Conservation League, an environmental advocacy group, has opposed the project, arguing that the Forest Service’s approval fails to adequately address risks to water quality and public health. The group contends that the mine could lead to long-term contamination of nearby rivers and watersheds.
Perpetua has revised its mine plan three times in response to regulatory concerns. The company said it believes the current proposal will minimize risks to the environment while bringing economic benefits to the region.
“Every detail of this project was examined with a fine-tooth comb,” said Perpetua CEO Jon Cherry.
Further approvals are required before construction can begin.
The U.S. Army Corps of Engineers must still issue a wetlands permit, which will determine how the mine can affect local waterways. The company must also secure financing to fund the project’s development.
In April 2022, Perpetua received a letter of interest from the U.S. Export-Import Bank for a loan of up to $1.8 billion to help finance the mine.
The project’s approval reflects Washington’s broader focus on building domestic supply chains for critical minerals. The U.S. currently relies heavily on China and other foreign producers for materials like antimony, lithium, and cobalt.
Perpetua’s Stibnite mine is one of only a few projects in the U.S. with the potential to reduce that dependence.
However, environmental groups and some local residents remain wary of the project’s long-term impact on Idaho’s natural resources.
