How IRIS Metals Plans to Unlock Montana’s High-Grade Tungsten Potential

Strategic Expansion into Tungsten

IRIS Metals Limited (ASX:IR1) has taken a significant step in diversifying its critical minerals portfolio by executing a definitive farm-in agreement with Finley Mining Inc. This agreement grants IRIS the right to earn up to a 100% fully diluted shareholding in Finley Mining, owner of the high-grade Finley Basin Tungsten Project located in Granite County, Montana, USA. The move follows a binding Heads of Agreement signed in December 2025 and positions IRIS firmly within the tungsten sector, a metal increasingly recognised for its strategic importance in defence, aerospace, and advanced manufacturing.

Project Overview and Historical Context

The Finley Basin Project covers approximately 378 hectares of unpatented mining claims in the Flint Creek Mountain Range, an area with a rich history of tungsten exploration dating back over a century. Historical work by Union Carbide Corporation in the late 1970s and early 1980s identified a non-JORC compliant mineral reserve estimate of 850,000 tons at an average grade of 0.68% tungsten trioxide (WO₃). While these historical figures provide a promising indication of the project's potential, IRIS cautions that these estimates have not been independently verified or classified under modern JORC standards.

Pathway to Resource Definition and Development

IRIS plans to commence a Phase I drill program in the third quarter of 2026, aiming to deliver an initial JORC-compliant mineral resource estimate by early 2027. The program will include over 4,500 metres of drilling to confirm and expand on historical results, alongside metallurgical testing to validate processing methods using a nearby fully permitted contract flotation mill in Phillipsburg, Montana. This proximity to existing infrastructure could facilitate efficient project development, a key advantage in the competitive critical minerals landscape.

Transaction Structure and Financial Considerations

The farm-in agreement is structured in stages, with IRIS required to fund US$1 million in exploration over two years to earn an initial 70% interest, followed by an additional US$1 million over a further two years to increase its stake to 90%. The remaining vendor interest would convert to a 2% net smelter royalty, allowing IRIS the potential to secure full ownership. The deal also includes upfront share issuances and deferred share payments contingent on achieving specified JORC resource milestones, subject to shareholder approval.

Strategic Implications and Market Context

This acquisition aligns with IRIS Metals’ broader strategy to build a diversified portfolio of critical minerals within the United States, complementing its existing lithium and rubidium assets in South Dakota. Tungsten’s critical role in defence and energy sectors, combined with growing geopolitical emphasis on secure domestic supply chains, underscores the strategic value of the Finley Basin Project. IRIS’s entry into this space could position the company as a key player in the US critical minerals supply chain, benefiting from government incentives and rising demand.