Successful Exploration Transforming McEwen's Gold Bar Mine Complex Sets the Stage for Meaningful Mine Life Extension

The most recent news release from December 8, 2025, titled "Successful Exploration Transforming McEwen's Gold Bar Mine Complex Sets the Stage for Meaningful Mine Life Extension," details positive drilling results from three key areas within the Gold Bar Mine Complex in Nevada: Lookout Mountain, Windfall, and Unity Ridge.

• Lookout Mountain: The 2025 drill program has concluded, with an updated resource estimate to be published alongside year-end financials. Notable intercepts include 1.0 gpt gold over 89.9 meters (LM045) and 1.0 gpt gold over 54.9 meters (LM016). Existing resources are 423,000 oz gold (Measured & Indicated) and 84,000 oz gold (Inferred).
• Windfall: Significant intercepts were reported, such as 4.6 gpt gold over 26.7 meters (WF055) and 3.7 gpt gold over 26.0 meters (WF056). A resource estimate for Windfall is scheduled for next year.
• Unity Ridge: Evaluation is in its early stages, aiming to expand and merge existing pits. Highlights include 3.6 gpt gold over 48.8 meters (GB660) and 3.7 gpt gold over 21.3 meters (PKC_009).

The company asserts that these results, particularly the demonstrated continuity of oxide gold mineralization and deeper high-grade zones, will contribute to increasing resources, extending the mine life, and potentially boosting annual gold production at the Gold Bar Complex. The upcoming year is described as pivotal for the Gold Bar operation.

This news is a positive development for McEwen Inc., particularly concerning its Gold Bar Mine Complex, which experienced operational challenges and production shortfalls in Q3 2025. The Q3 earnings report (November 6, 2025) highlighted issues such as a section of anticipated ore turning out to be unmineralized material, leading to lower production guidance and higher-than-expected costs at Gold Bar (Cash Costs $2,540/GEO, AISC $2,852/GEO). CEO Rob McEwen notably described the year-to-date production miss as "inexcusable" in the Q3 earnings call transcript.

In this context, the new exploration results from Lookout Mountain, Windfall, and Unity Ridge are encouraging. The reported gold grades (e.g., 4.6 gpt over 26.7m at Windfall, 3.6 gpt over 48.8m at Unity Ridge) and widths are attractive for potential open-pit, heap leach operations, especially given the mention of near-surface oxide mineralization in previous Windfall updates. This demonstrates successful exploration efforts to replenish and expand the resource base, which is crucial for extending the Gold Bar mine's operational life beyond 2029 (as targeted in the March 2025 annual report).

However, the impact is more routine positive than materially transformative at this stage. While the results indicate potential for "meaningful mine life extension," they are exploration intercepts that still need to be converted into updated mineral resource estimates (for Lookout Mountain with year-end financials, for Windfall next year) and subsequently into reserves for inclusion in a mine plan. This process requires further time and investment. The news does not immediately address the short-term operational hurdles or cost efficiencies required to meet the revised 2025 production guidance (112,000-123,000 GEOs, lowered from 120,000-140,000 GEOs). It provides a positive outlook for the future of Gold Bar but does not resolve the immediate challenges that led to the Q3 underperformance. The exploration success helps to de-risk the longer-term asset base, but the conversion to tangible production and financial improvement is still some time away.

McEwen Inc. (formerly McEwen Mining Inc.) is a gold and silver producer with a diversified portfolio of operating mines and development projects in North and South America, notably in Canada (Ontario), the United States (Nevada), and Argentina. The company's strategic vision, championed by its Chief Owner Rob McEwen, is to expand its annual gold and silver production significantly by 2030, targeting 250,000 to 300,000 gold equivalent ounces (GEOs), while simultaneously advancing its substantial copper project.

Flagship Projects:

• Los Azules Copper Project (Argentina): This is the company's major copper development asset, owned 46.4% by McEwen Copper Inc. (a subsidiary of McEwen Inc.). It is characterized as a world-class, long-life, low-impact copper project. A recently completed Feasibility Study (FS) confirmed robust economics, including an after-tax NPV(8%) of $2.9 billion and an IRR of 19.8%, with initial capital expenditure estimated at $3.17 billion. The project aims to produce 99.99% LME Grade A copper cathodes with a significantly reduced environmental footprint, including 100% renewable power and 74% less water usage compared to conventional milling. It has been accepted into Argentina's Large Investment Incentive Regime (RIGI), providing significant tax and regulatory stability for 30 years, a key derisking factor. First copper production is targeted for 2030. McEwen Inc. also holds a 1.25% Net Smelter Royalty (NSR) on Los Azules.
• Fox Complex (Timmins, Ontario, Canada): This 100%-owned gold complex is a key operating asset, currently relying on the Froome mine, with plans to transition and expand production from the Stock Mine and Grey Fox deposits. The Stock Mine is undergoing ramp development and is expected to reach commercial production in H1 2026. Grey Fox has shown significant resource growth (Indicated resources increased by 32% to 1.538 Moz, Inferred by 95% to 458 koz Au in Dec 2024 update) and a PFS is expected in H1 2026.
• Gold Bar Mine (Nevada, USA): A 100%-owned open-pit, heap leach gold mine. Recent exploration at areas like Windfall, Lookout Mountain, and Unity Ridge aims to extend its mine life beyond 2029. However, the mine faced operational challenges in Q3 2025 due to encountering unmineralized material in a planned mining area.
• San José Mine (Santa Cruz, Argentina): A 49%-owned joint venture gold-silver mine. While a producing asset, it has also experienced challenges, including lower processed grades and recovery rates in Q1 2025.

The company has also made strategic investments in Goliath Resources Limited (a gold explorer in British Columbia's Golden Triangle) and is in the process of acquiring Canadian Gold Corp. (owner of the Tartan Lake Gold Mine project in Manitoba). Additionally, McEwen Inc. made a strategic investment in Paragon Geochemical Laboratories Inc., a leader in PhotonAssay technology, to improve exploration efficiency.