GoldQuest extends polymetallic VMS mineralization at Cachimbo, Dominican Republic

Vancouver, British Columbia--(Newsfile Corp. - May 28, 2026) - GoldQuest Mining Corp. (TSXV: GQC) (OTCQX: GDQMF) (" GoldQuest " or the " Company ") reports new assay results from the ongoing exploration campaign at the Cachimbo target. Drill hole TIR-26-62, a follow-up to discovery hole TIR-26-58, intersected 12.15 metres of high-grade polymetallic VMS mineralization, confirming continuity of the newly identified high-grade mineralized level. The new intercept confirms a gold-silver-copper-zinc-lead VMS level at Cachimbo and opens additional potential along trend, particularly toward the northwest.

The results provide additional geological information regarding the mineralized system and will be incorporated into ongoing geological interpretation and drill targeting activities. TIR-26-62: 12.15 m @ 8.60 g/t Au, 128.2 g/t Ag, 0.77% Cu, 11.21% Zn and 0.34% Pb from 277.35 m depth. High-Grade VMS Level Confirmed: The new intercept follows TIR-26-58 and provides a second high-grade intersection of the polymetallic VMS level, supporting continuity of the mineralized horizon.

Very High Zinc Values : A sub-interval returned 3.35 m @ 9.95 g/t Au, 120.7 g/t Ag, 2.39% Cu, 35.85% Zn and 0.56% Pb. One sample returned zinc above the upper detection limit (>40% Zn) and is being re-analyzed by the laboratory. Open Along Trend: The new result opens potential along trend, particularly toward the northwest, and supports further drill testing at Cachimbo and within the broader 7.5 km anomalous corridor.

Additional Results Pending: Assays from a stringer zone below the high-grade VMS level remain pending and will be reported once received and reviewed. Hole TIR-26-62 was drilled as a follow-up to TIR-26-58, which confirmed a new mineralized parallel structure at Cachimbo earlier in 2026. Located 60 metres to the northeast of TIR-26-58, the new hole intersected a high-grade polymetallic in