Mr. Michael Bennett reports

ALTAMIRA GOLD SECURES LAND ACCESS TO HIGH-PRIORITY GOLD TARGETS, UNLOCKING A NEW PHASE OF EXPLORATION IN THE WEST OF THE CAJUEIRO GOLD DISTRICT, BRAZIL

Altamira Gold Corp. has secured surface access to the western extension of the Cajueiro exploration licences, including the high-priority Novo Sonho target. The access commences immediately west of the Maria Bonita porphyry gold deposit and extends over an area of 58 square kilometres, of which only five square kilometres have been systematically sampled to date. This represents a significant strategic milestone, enabling the systematic exploration of some of the most geologically compelling untested targets in Altamira's district-scale portfolio.

Highlights:

• Novo Sonho is located approximately three km west-southwest of Maria Bonita, Brazil's first confirmed porphyry gold deposit, which hosts a maiden indicated resources of 24.2 million tonnes of 0.46 gram per tonne gold (357,800 ounces) and inferred resources of 25.6 Mt of 0.44 g/t gold (362,400 oz).
• Novo Sonho is defined by a significant gold-in-soil anomaly associated with an alluvial dispersion train, within a 15-kilometre east-west structural corridor hosting multiple intrusive-related gold prospects across the Cajueiro district.
• Artisanal gold workings in nearby south-draining streams confirm an east-west gold-bearing corridor of at least five km centred on the Maria Bonita porphyry, further supporting the prospectivity of the recently accessible area.
• Drilling is planned in both the western extension of the Maria Bonita resource and at the Novo Sonho target.

President and chief executive officer Mike Bennett commented: "Securing surface access to both Novo Sonho and the western part of the Maria Bonita porphyry gold deposit represents an important step in our strategy to continue growing the mineral inventory of the Cajueiro district and identifying additional porphyry gold centres along a 15-kilometre corridor. This newly accessible area is particularly exciting because the Maria Bonita resource appears to extend westward onto this ground, opening up significant exploration potential beyond the limits of the current resource. Novo Sonho is also one of the most geologically attractive targets in our portfolio. With access now secured, we can move quickly to drill test these targets and systematically explore the remainder of our licence areas."

Cajueiro district

The Cajueiro district is located approximately 75 km northwest of the town of Alta Floresta in the state of Mato Grosso in central-western Brazil. The project is easily accessible by road, lies on open farmland, and has grid power and a local water supply. Cajueiro is the most advanced of the key projects that Altamira controls in the region.

The Cajueiro district consists of two independently estimated gold mineral resources at Cajueiro Central and Maria Bonita, plus a series of eight additional untested exploration targets within a radius of eight km of Cajueiro Central.

The Cajueiro Central area has a current open-pit resource of 5.66 Mt of 1.02 g/t gold containing 185,000 oz in the indicated resource category and 12.66 Mt of 1.26 g/t gold (515,000 oz) in the inferred resource category (estimated using a cut-off grade of 0.25 g/t Au and a gold price of $1,500 (U.S.) per oz).

The Maria Bonita open-pit resource consists of indicated resources of 24.19 Mt of 0.46 g/t gold (357,800 oz) and inferred resources of 25.64 Mt of 0.44 g/t gold (362,400 oz). These resources were calculated using a 0.2 g/t gold cut-off grade and a gold price of $2,780 (U.S.) per oz. These resources include near-surface saprolite indicated resources of 2.02 Mt of 0.59 g/t gold (38,000 oz) and inferred resources of 680,000 tonnes of 0.40 g/t gold (8,700 oz).

The Maria Bonita porphyry gold deposit forms part of a district-scale portfolio of prospects that are interpreted as having a similar geological origin. The Cajueiro area is characterized by a 15-kilometre stretch of former alluvial gold workings along the Teles Pires River. The source of some of this alluvial gold is related to a pronounced east-west corridor of gold anomalies in soils and rock chips and a set of subcropping intrusions extending east-west, implying the presence of a long-standing and deep-seated reactivated crustal structure.

Novo Sonho target

Novo Sonho was identified in prior fieldwork investigating potential source areas above alluvial artisanal gold workings using soil sampling. The gold-in-soil anomaly has a strike extent of 3,000 metres.

This soil grid covers an area of five square kilometres out of a total exploration licence area of 58 square kilometres that is now accessible in full.

The Novo Sonho target is situated three km southwest of the Maria Bonita porphyry gold deposit and is spatially associated with an alluvial dispersion train reflecting the upstream presence of primary gold sources.

The ternary radiometric image shows that the Maria Bonita gold deposit is associated with a distinctive radiometric domain that extends west-southwest toward the Novo Sonho target. The partial coincidence of this radiometric signature with gold-in-soil anomalies and historical alluvial workings further supports the prospectivity of this largely underexplored corridor. Regional artisanal gold workings in south-draining streams in and around the Maria Bonita area confirm an east-west corridor of gold-in-stream sediment dispersion of at least five km. Novo Sonho occupies the western segment of this corridor, reinforcing the interpretation that a primary gold-bearing source system may underlie the target at shallow depth.

Planned exploration program

With access secured, the company plans to advance exploration at Novo Sonho through confirmation of the soil anomaly, trenching and scout drilling. Stream sediment and soil sampling will be extended over the rest of the exploration licence to identify primary gold-bearing sources.

Resource extension drilling will continue to the west of the Maria Bonita mineral resource where recent drilling has found gold mineralization associated with hydrothermal quartz veining, both within and outside of porphyry host rocks over significant intervals.

Qualified person

Fernando Benegas, FAusIMM, a consultant to the company, as well as a qualified person as defined by National Instrument 43-101, supervised and approved the preparation of the technical information in this news release.

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 million ounces of placer gold. The company's advanced Cajueiro project contains two gold deposits. Continuing exploration and fieldwork at Cajueiro indicate the presence of multiple hardrock 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.

Quality assurance/quality control

Drill holes commence in HQ diameter (63.5 millimetres) and proceed to the base of weathering where core diameter is reduced to NQ (47.6 mm). Logging and sampling are completed at a secure company facility located on site. Drill core is cut in half on site by a saw cut or slicer (in soft saprolite). Until dispatch, samples are stored under the supervision of the company's exploration office. The samples are couriered to the assay laboratory using a commercial contractor. Pulps are returned to the company and archived.

For all drilling, half core is submitted to SGS Geosol, a leading commercial laboratory in Brazil, and analyzed for gold by 50-gram fire assay, plus a suite of other elements by the ICP atomic absorption method, using standard laboratory procedures. Soil and rock chip samples follow the same analytical protocol.

Quality control of drill hole assays follows normal industry procedures of inserting control samples randomly into the submitted batch, comprising field duplicates, independent reference samples and blank samples. Selected batches of sample pulps are periodically resubmitted to a third party laboratory to check the main laboratory precision and accuracy. Drill holes results are quoted as downhole length weighted intersections.

Additional information regarding the company data verification processes is set out in the National Instrument 43-101 technical report, Maria Bonita prospect, June, 2025, which can be found on the company's website.

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