Name of the Project
Stibnite gold project.

Location
Central Idaho, in the US.

Project Owner/s
Mining exploration and development company Perpetua Resources Corp.

Project Description
The project is expected to be one of the highest-grade openpit gold mines in the US. It is designed to redevelop the abandoned Stibnite mine site for gold, silver and antimony, while providing environmental restoration for the dormant site.

The project contains an estimated 4.8-million-ounce gold reserve and is expected to produce 450 000 oz/y of gold over the first four years of production.

In addition, the estimated 148-million-pound antimony reserve is the only identified antimony reserve in the US, and is expected to supply an estimated 35% of the country’s demand in the first six years of operation. 

Antimony is a listed critical mineral for its role in technology, defence and energy products.

Potential Job Creation
Not stated.

Net Present Value/Internal Rate of Return
The project is expected to provide an estimated 550 jobs for rural Idaho during operations.

Capital Expenditure
Not stated.

Planned Start/End Date
The US Forest Service approved the mine plan in January 2025, in accordance with the country’s National Environmental Policy Act.

This final record of decision concludes an extensive eight-year process of investigation, analysis, consultation and public engagement.

The approval enables Perpetua to proceed towards a final construction decision, including securing remaining federal and state permits, and project financing.

Latest Developments
Perpetua Resources has secured a key US Forest Service authorisation to start the development of the project, clearing the way for construction after nearly a decade of federal permitting.

The conditional notice to proceed confirms the project has met all requirements under the January 2025 record of decision. The only remaining step before initial work can start is the posting of a joint financial assurance bond, agreed to with the Forest Service, the Idaho Department of Lands and the US Army Corps of Engineers.

“After eight years of extensive permitting review and over $400-million invested, it is finally time for the Stibnite gold project to deliver for America,” president and CEO Jon Cherry said on September 19 in a statement. 

Perpetua aims to post the required financial assurance in the coming weeks, allowing for early construction to start in due course.

The Stibnite project, listed under the US President Donald Trump’s administration’s FAST-41 programme to streamline permitting, has drawn more than 23 000 supportive public comments. Its mine plan includes habitat restoration, footprint reductions and improved water quality.

Key Contracts, Suppliers and Consultants
None stated.

Contact Details for Project Information
Perpetua Resources Corp, tel +1 208 901 3060 or email info@perpetuacorp.us.