Project Overview


Perpetua Resources and our team of professionals and consultants have studied the Stibnite Gold Project site for the past decade, searching for minerals, identifying opportunities to work closely with local residents and businesses and creating a plan to use responsible, modern mining to address environmental legacies and add to the economic success of Idaho.

Our plan for the Stibnite Gold Project site is about restoring the site as well as mining it for the much-needed critical mineral antimony and gold. Redeveloping this already mined area will allow us to generate the funds needed to properly take care of the environment.

Fish haven’t been able to swim past the historic Yellow Pine pit since 1938, almost no topsoil can be found in the area, due to extensive erosion, and millions of tons of sediment are running into the waterways, degrading water quality and fish habitat. Arsenic and antimony from historic tailings leach into the waterways and waste dumps negatively impact water quality. Our plan will address these impacts and we’ve intentionally designed it so a lot of the restoration work will occur early on in the project.

We are proud of the Stibnite Gold Project and our team. We remain committed to ensuring our project takes care of the environment and the resources at site for this generation and the many more to come. The safety of our team and the community will always remain at the forefront of everything we do. And above all else we are focused on creating a positive, long-term impact on Idaho.

We care deeply about Valley County and the people who call it home, including our own employees. For the last ten years, we have been getting to know our community and learning what is most important to the people who call this area home. Community input helped shape our plans and guide our designs and ultimately allowed us to create something better than we could have done on our own.

We hope you will take the time to read our Plan and provide us with your feedback.

Tour the Stibnite Gold Project

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The Stibnite Gold Project is located in the abandoned Stibnite Mining District in Valley County, which is approximately 44 air miles northeast of Cascade, Idaho and near Yellow Pine, Idaho.

Environmental Highlights

Mining started at Stibnite in 1899 and continued on and off for more than a century. Much of the mining activity that took place at site occurred long before environmental regulations existed. This has left the site in desperate need of repair. Action must be taken to address the legacies impacting water quality and habitat today.

The East Fork of the South Fork of the Salmon River currently flows into an abandoned mining pit. The project will restore the natural flow of the river and allow salmon to migrate to their native spawning grounds for the first time in more than 80 years.

The project will improve water quality at site by reprocessing and safely storing the millions of tons of historic tailings that are currently laying in the valley floor unconstrained.

Millions of additional tons of waste rock dumped around the site will be recovered and reused in properly designed locations.

Economic Highlights

The Pre-Feasibility Study in 2014 found:

  • The Stibnite Gold Project has the largest known antimony resource in the U.S.
  • The project is one of the top 10 gold deposits in the U.S.
  • We will recover more than 4 million ounces of gold over the 12 years projected for the life-of-mine.
  • Almost $1 billion of initial investment will be required to build the Stibnite Gold Project, with another $200 million invested in Idaho over the life of mine.
  • The high grades, combined with good recoveries and other positive attributes means the Stibnite Gold Project has low operating costs compared with foreign gold operations worldwide.

Financial Support from Key Investors

Perpetua Resources has a strong community of investors including many U.S.-based, large institutional investors. At the end of 2020, our team released the feasibility study. Read it here to get the latest updates on the Stibnite Gold Project.

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