Minera Alamos Announces Positive Pre-Feasibility Study for the Copperstone Gold Project in Arizona

About this update from Minera Alamos Inc.

Board of Directors Approves Fast-Track Construction Toronto, Ontario--(Newsfile Corp. - May 27, 2026) - Minera Alamos Inc. (TSXV: MAI) (OTCQX: MAIFF) ("Minera Alamos" or the "Company") is pleased to announce the results of a pre-feasibility study (the "PFS") on its 100%-owned, past-producing Copperstone project ("Copperstone" or the "Project") located in La Paz County, Arizona, USA. A technical report for the Copperstone PFS is being prepared in accordance with National Instrument 43-101 ("NI 43-101") and will be filed under the Company's profile on SEDAR+ and on the Company's website within 45 days of this news release. All dollar amounts in this news release are expressed in U.S. dollars, unless otherwise noted. Metric tonnes are referred to as "t", imperial short tons as "st", grams as "g", gold as "Au", troy ounces as "oz", thousands of troy ounces as "koz", and millions as "M". Copperstone Pre-Feasibility Highlights 1 Total cash costs and AISC are non-IFRS measures. For more details refer to the "Non-IFRS Measures" section of this release. Darren Koningen, President & COO, commented, "The Copperstone PFS results show a high-return, low capital underground gold mining project with first gold production anticipated in mid-2027 and which will more than double our Company's annual gold production once ramped up. Our Board has made a formal investment decision for construction of the Copperstone project, with full-scale engineering, procurement and construction activities commencing in June, and mobilizing the underground mining contractor in the near-term. The increase in initial capital cost versus the 2025 PEA allows for an expanded process plant capable of increasing throughput from 600 tons per day to 1,000 tons per day. In addition, a planned 3-month ore stockpile ahead of mill startup helps to de-bottleneck the commissioning and ramp-up of the project. "The PFS represents an excellent starting point for the project while the Company continues to evaluate opportunities for resource expansion underground and potentially including a new open pit." Figure 1 – Copperstone project site overview To view an enhanced version of this graphic, please visit:https://images....

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