All dollars in this announcement are US dollars unless otherwise stated. Feasibility Study Highlights: Commenting on the Feasibility Study completion and key outcomes, Sandfire America CEO and Project Director Rob Scargill stated: "The positive outcomes of the Feasibility Study show that we can deliver a robust underground mining project at Black Butte that meets the world's highest environmental standards while at the same time creating jobs, opportunities and significant direct and indirect benefits for the State of Montana. "This is one of the highest-grade copper deposits in the world and one of the very few fully-permitted and development-ready copper assets globally. The Feasibility Study delineates a clear pathway to unlocking its value for our shareholders in a manner that is consistent with world-best practice in ESG and community engagement.