Minera Alamos Reports Positive Pre-Feasibility Study for Copperstone Gold Project

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 Strong project economics : At base case gold price of $3,500/oz, after-tax net present value 5% ("NPV5%") of $374 M, internal rate of return ("IRR") of 108%, payback period of 1.2 years, and net cashflow of $512 M. At spot gold price of $4,500/oz, after-tax NPV5% of $537 M, IRR of 154%, payback period of 0.8 years, and net cashflow of $725 M. Resilient, low-cost mine plan : PFS life-of-mine ("LOM") plan shows an initial 6.3-year mine life producing a total of 291 koz gold with average annual production of 46 koz at total cash costs 1  of $1,070/oz gold and all-in sustaining costs 1 ("AISC") of $1,314/oz gold. Initial production anticipated in mid-2027, more than doubling the Company's projected annual gold production : Based on the PFS results and current estimates, project construction is expected to take approximately one year, with initial gold production anticipated by mid-2027.

Given Copperstone's average annual p