Altamira Gold discovers mineralized porphyry body at Maria Bonita West, Brazil

Vancouver, British Columbia--(Newsfile Corp. - August 25, 2026) - Altamira Gold Corp. (TSXV: ALTA) (FSE: T6UP) (OTCQB: EQTRF), (" Altamira " or the " Company ") is pleased to announce the results of four additional drill holes, MBA-040 to 043, which tested the western extension of the Maria Bonita gold porphyry system. Two of these drill holes returned wide intervals of gold mineralization, confirming the presence of a new mineralized early porphyry body, previously detected in hole MBA-036 (70.6m @ 0.5g/t gold); see press release dated May 12, 2026.

Highlights:

Drill hole MBA-042 intersected three intervals of gold mineralization, comprising a total of 282m downhole, including 36.2m @ 0.4g/t gold from surface, 45.4m @ 0.3g/t gold from 61.9m depth and 200.4m @ 0.3g/t gold from 113.2m depth

Drill hole MBA-043 intersected 231.5m @ 0.4g/t gold from 93m depth

Both drill holes intersected quartz-veined porphyritic rocks within a newly defined western intrusive body, interpreted to represent a distinct phase of the Maria Bonita system, separated from the eastern body by a late intrusive dyke. As with previous drill holes at Maria Bonita, gold mineralization is very consistent

President & CEO Michael Bennett commented; "Our continued exploration drilling program over the western part of the Maria Bonita mineralized porphyry system is delivering highly encouraging results. We have now confirmed a new mineralized porphyry body at Maria Bonita West, with drill holes MBA-042 and MBA-043 delivering two of the widest coherent mineralized intersections encountered in our drilling to date. These positive results suggest that the Maria Bonita system extends further west than previously recognized with the mineralized body remaining open to the west and at depth. With our recently secured land access to the adjacent property, we are now in a strong position to continue d