Tintina Mines drills at Dos Amigos project in Chile

40,000-metre infill drilling program underway at Dos Amigos in support of a planned feasibility study; Appointment of Richard Leclerc as General Manager

TORONTO, ON AND SANTIAGO, CHILE / ACCESS Newswire / September 22, 2026 / Tintina Mines Limited (TSXV:TTS)(OTC PINK:TNNTF) ("Tintina" or the "Company") is pleased to announce the commencement of diamond drilling and field activities at its wholly owned Dos Amigos project ("Dos Amigos" or the "Project") in the Atacama Region of Chile. An initial approximately 40,000-metre ("m") program has been designed to support the conversion of Inferred Mineral Resources to the Indicated category, which is intended to form the basis for future feasibility study workstreams. Tintina intends to release drilling results on a regular basis throughout the program, with initial assays expected mid-November.

In addition, the Tricolor target, a high-priority porphyry target located ~3km north of Dos Amigos, will be drill tested in Q4 2026. Previous drilling in 2018 at Tricolor returned 230m @ 0.56% copper ("Cu") and 0.33 g/t gold ("Au") from 18m to end-of-hole (SDDK 18-035).

Infill Drilling Program

The key near-term priority is approximately 40,000m of diamond drilling designed to support the conversion of existing Inferred Mineral Resources to the Indicated category. The Mineral Resource Estimate prepared by SRK Consulting (Chile) SpA ("SRK") and set out in the technical report titled "Technical Report NI 43-101 - PEA Domeyko Sulfuros" with an effective date of January 23, 2026 (the "Technical Report"), which supports the 2026 preliminary economic assessment ("PEA"), is as follows (see "Cautionary Note Regarding Mineral Resources" below):

Measured & Indicated Mineral Resources - 100.8 million tonnes ("Mt") at 0.35% copper and 0.28 g/t gold (0.52% copper equivalent ("CuEq") at PEA base-case metal prices; 0.56% CuEq at current consensus long-term m