Common questions answered

Perpetua Resources is a publicly traded company. Company shares are owned primarily by investors in the United States and Canada, as well as overseas. As of June 30, 2022, institutional investors make up more than 75% of the company ownership including Paulson & Co. (~39%), Sun Valley Gold (~9%), Kopernik (~8%) and Nokomis (~2%).

No, Perpetua is solely focused on the Stibnite Gold Project.

No. Perpetua Resources Corp. is based in Boise, Idaho. It is a publicly owned company, traded on the Nasdaq and Toronto Stock exchange. The project is owned and staffed by Idaho companies, and regulated by county, state and federal agencies in the U.S.

There is no business relationship between the two companies. Their proposed projects take place in two different national forests: Stibnite is in the Payette National Forest, while Stallion Uranium’s is in the Boise National Forest.

Perpetua Resources’ claim package includes 29,827 acres of private and public land, but the onsite project footprint is only 1,740 acres—just 5.8% of the total package. Approximately 51% of the project footprint is on land that has already been disturbed by previous mining activity.

The Stibnite Gold Project is designed to mine gold, antimony, and silver.

The project goes beyond the reclamation required by law. Perpetua designed the Stibnite Gold Project to leave the site better than they found it. Repairing the East Fork South Fork of the Salmon River, restoring fish passage, addressing legacies of the past, and repairing Blowout Creek are not required by regulation, but they are the right thing to do.

Perpetua Resources plans to excavate three open pits, two of which (Yellow Pine and West End) are expansions of existing pits at site today. The third proposed pit, known as Hanger Flats, is located at the site of a former underground mine, processing facilities, and smelter.

Mining, environmental technology, and practices have evolved; engineering controls have been developed, and federal and state regulatory programs and financial assurance requirements have been adopted since the early 1990s to ensure comprehensive bonding for mining’s impacts. The Stibnite Gold Project was designed from the start with ultimate closure in mind, and with restoration and reclamation as primary design standards.

Dust abatement is a high priority across the site and throughout the life of the project. Best management practices include the application of water and/or approved chemical treatments to road surfaces, installation of spray bars at processing areas, and enclosure of dust-generating mill processes.

Perpetua factored risks ranging from rain-on-snow events to earthquakes into the engineering and design of the infrastructure. By adding an 80-million-ton buttress to the face of the tailings storage facility, the factor of safety for the facility is 5.9, which is nearly four times the state requirement of 1.5. The facility was designed to withstand shaking about 6 times stronger than what was experienced in the March 2020 earthquake.

Yes, the company has a recycling program for plastic, glass, and metal, and plans to compost food waste at the worker housing facility to use in reclamation activities.

Perpetua designed its shifts to be two weeks on, two weeks off, to make it possible for employees to live anywhere in Idaho to reduce impacts on local communities by spreading employees over a larger area. Perpetua believes impacts will be limited, estimating about 120 people will move into the Valley and Adams County region from elsewhere.

Transportation experts anticipate the traffic created by the project will add approximately 1–3% more new vehicles on the road. The company will drive 90% of its employees to the site on buses and is committed to transporting goods Monday through Friday during business hours as much as possible.

No. It is an industry best practice for transparency and collaboration. Participating communities are not required to support the project, and funding is not tied to their support.

There is no data suggesting modern mining increases crime. Employees must meet strict standards, stay at the site during their shifts, and adhere to a strict no-alcohol or drug policy.

The project received its Final Record of Decision in January 2025 and a Notice to Proceed from the U.S. Forest Service in September 2025. Early works construction began in October 2025.

No. The plan has been continually refined based on science and stakeholder feedback. A 2020 update improved water quality and eliminated the need for perpetual water treatment.

This law governs mineral rights on federal lands. However, over 90% of the mineral resources at Stibnite are on Perpetua’s private land. The project will still provide benefits to local, state, and federal governments through various taxes.

The project has low operating costs designed to weather weaker gold prices. The company may also pre-sell gold at a fixed price to reduce financial risk.

Before Perpetua Resources was allowed to begin construction or mining operations, the company was required by law to set aside all the funds necessary to fully reclaim and restore any disturbance made to the site.

Historical assurance often used flat-fee structures that didn’t match real costs. Perpetua uses the Standardized Reclamation Cost Estimator (SRCE), which bases the bond amount on detailed, site-specific factors and government-contracting rates.

No. Permanent water treatment will no longer be required. Water treatment is required at site during operations and for approximately eight years following active mine operations.

The geochemical composition of the substantial majority of rocks at site make acid rock drainage highly improbable. Testing shows the samples generally had minimal acid generating potential but a significant amount of neutralization potential due to carbonate minerals.

Yes, as a temporary solution. A 0.9-mile state-of-the-art tunnel with resting pools and lighting will be used until the Yellow Pine pit is backfilled and the river is permanently restored.

Yes. Naturally occurring mercury will be collected by scrubbers and retort condensers, then transported to an approved offsite hazardous waste facility.

Yes. All processing occurs in an enclosed facility with 110% secondary containment. Furthermore, a cyanide destruction process neutralizes the solution to negligible levels before it ever leaves the building for the lined storage facility.

It will be delivered as solid briquettes in specially designed sealed trailers, escorted by a HAZMAT-equipped vehicle.

Used oil is currently used as fuel for onsite heaters. Any oils that cannot be used as fuel are shipped to certified recycling or disposal facilities.

It is constructed using the “downstream method” with coarse rockfill, which is the most stable design. It also features an 80-million-ton rock buttress that doubles the required safety factor.

Yes. It is fully lined with a composite system consisting of a Geosynthetic Clay Liner (GCL) and a linear low-density polyethylene (LLDPE) geomembrane with a half-life of over 450 years.

While an avalanche could cause minor damage, such as blocking a diversion ditch, it would be repairable in short order and is not expected to cause a major failure.

Yes. Perpetua worked with the community to identify alternative routes to allow seasonal public access through the site during operations.

The company is evaluating options to support U.S. critical mineral needs and has signed an agreement with U.S. Antimony to evaluate North American processing facilities.