Tier One Silver Inc. announced that recent geophysical survey results, combined with existing exploration data sets, have led to the identification of two porphyry copper targets underlying the silver-gold epithermal mineralization defined on surface at its Curibaya project in southern Peru. Tier One Silver completed a 42.7-line kilometre (km) Controlled-Source-Audio-Frequency Magnetotelluric (CSAMT) geophysical survey over the central portion of the Curibaya project in late 2022. These new data sets were integrated into the exploration model, building on previous geophysical, geochemical and geological data sets, to generate targets for the Company's next drill program at the project.

The drilling, which is anticipated to begin in second quarter, will comprise of approximately 5,000 metres (m) to follow-up on the high-grade silver-gold epithermal mineralization defined at surface and target the two main conductive features that may relate to a porphyry system. A CSAMT geophysical survey was completed in October 2022 to augment previously completed geophysical, geochemical and geological surveys. CSAMT is used as an exploration tool to identify deeply rooted resistive and conductive features that may correlate to feeder and breccia structures, and/or zones of silicification and clay alteration, possibly related to porphyry copper targets.

An inversion of the Curibaya CSAMT data outlines two main conductive features that are 400 m by 400 m and 600 m by 500 m, respectively, and show significant depth extent over 700 m. Pseudo sections for lines L5800 and L6200 clearly illustrate sub-vertical conductive features. Both the high conductivity and low resistivity features are sub-vertical and located under important alteration features such as an advanced argillic lithocap, a skarn and hornfels area and a white mica alteration area. Additionally, these conductive anomalies are geochemically anomalous in bismuth, tellurium, selenium and copper.

The hydrothermal alteration present in the upper part of the system and the geophysical features are consistent with buried porphyry systems.