Orla Mining Ltd. Delivers Initial Underground Mineral Resource for Camino Rojo in Mexico, Paving the Way for Future Development Planning

Published: 2025-06-05 07:05:44 ET OLA.TO

Published on 06/05/2025 at 07:05

Orla Mining Ltd. provided the first underground Mineral Resource estimate for the Company's Camino Rojo deposit located in Zacatecas, Mexico, representing a down plunge extension from the oxide open pit. This news release presents the initial underground Mineral Resource estimate for the Camino Rojo deposit, incorporating mineralization hosted in the Camino Rojo Sulphides and extending into the underlying Zone 22. The 2025 drilling results from Zone 22 will be incorporated in future resource updates.

Recovery model supported by ongoing metallurgical work: The mineral resource is divided into three spatially distinct zones, each with specific processing options for the Caracol-hosted mineralization: heap leaching (3); cyanidation (CIL) (25); and flotation followed by pressure oxidation ("POX") as a pre-treatment prior to cyanidation (CIL with POX) (72%). These zones inform the resource recovery assumptions. Evolution of Camino Rojo Deposit: Orla's north-to-south drilling programs from Fourth Quarter-2020 to Fourth Quarter-2024, together with historical drilling data, have been instrumental in enhancing the geological model.

Development Pathway /Next steps: Current and Planned Future Exploration: In 2025, Orla is advancing a 15,000-metre drilling program aimed at upgrading and expanding the upper part of the Zone 22 resource, with 11,000 metres drilled to date. Visual drill intercepts continue to support the geological model and continuity of mineralization. This program is expected to be completed in the third quarter and is anticipated to extend and infill the down-plunge extension.

Longitudinal Sections of the Camino Rojo deposit show the three mineralized zones and new resource block model, as well as the distribution of gold grades. Zone 22: Initial drilling to resource in two years; open for upgrade and expansion. Ongoing exploration at Camino Rojo continues to expand the deposit's footprint and refine geological understanding, defining additional mineralization beyond the currently outlined mineral resource.

All Orlametallurgical studies for the Camino Rojo SulPHides have been completed by Blue Coast Research of Parksville, Canada under the guidance of Andrew Kelly, P.Eng. Based on the metallurgical testing results to date, three conceptual mineral resource process streams have been identified that inform the recovery model assumptions of the Camino Rojo underground mineral resource (Measured, Indicated, Inferred): Heap leach (existing infrastructure), 3% of the tonnage of the underground Mineral Resource, with gold recovery ranging from 40% to 70%; Carbon-in-leach (CIL), 27% of the tonnage the underground Mineral Resource, with a mean gold recovery of 92%, and a mean silver recovery of 36%; CIL with Pressure Oxidation (POX): 70% of the tonnageof the underground Mineral Resource, with an mean gold recovery of 85%, and a mean silver recovery the mean silver recovery of 41%.