Mr. Michael Bennett reports

ALTAMIRA GOLD FILES NI 43-101 TECHNICAL REPORT ON UPDATED MARIA BONITA RESOURCE ESTIMATE, CAJUEIRO GOLD DISTRICT, BRAZIL

Altamira Gold Corp. has filed a National Instrument 43-101 technical report with an effective date of Sept. 16, 2026, on the updated resource estimate for the Maria Bonita porphyry gold deposit within the company's Cajueiro project in Brazil.

The report can be found under the company's profile on SEDAR+ and on the company's website. The updated resource was originally published in the company's news release on Sept. 21, 2026, which is also available for review on SEDAR+ and on the company's website. There are no material differences between the resource announced in the news release and the resource in the report.

Qualified person

Volodymyr Myadzel, PhD, MAIG, a consultant to the company, as well as a qualified person as defined by National Instrument 43-101, supervised the preparation of the technical information in the report.

About Altamira Gold Corp.

The company is focused on the exploration and development of gold projects within western central Brazil, strategically advancing four projects spanning over 90,000 hectares within the prolific Juruena gold belt, an area that has historically yielded over six 6 million ounces of placer gold (1). The company's advanced Cajueiro project contains two gold deposits. Continuing exploration and fieldwork at Cajueiro indicate the presence of multiple hard rock gold occurrences, traceable from historical alluvial gold production, highlighting the region's exceptional gold endowment and potential scalability. With two independently established mineral resources, a highly prospective geological setting and a record of significant discoveries, the company is well positioned to unlock further value across its extensive land package.

(1) National Instrument 43-101 technical report, mineral resource for the Maria Bonita prospect, VMG Consultoria, Belo Horizonte, Minas Gerais, Brazil, Sept. 16, 2026, author: V. Myadzel.

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