ATERRA Metals Commences Preparation of Maiden Mineral Resource Estimate for the Totora Cu/Au Project

Toronto, Ontario--(Newsfile Corp. - August 6, 2026) - ATERRA Metals Inc. (CSE: ATC) (OTCQB: CSSCF) ("ATERRA" or the "Company") is pleased to announce that it has commenced preparation of the Company's maiden independent Mineral Resource Estimate ("MRE") for its Totora Cu/Au Project ("Totora" or the "Project"). The maiden MRE will define Totora's initial mineral inventory and establish the technical foundation for future economic studies.