From a metallogenetic standpoint, mineralisation in the Quinchía district is genetically linked to the emplacement of a cluster of Miocene-aged hypabyssal porphyry bodies. A variety of magmatichydrothermal Au (Cu) and Au-Ag (Pb, Zn, Cu) deposit types are associated with the geochemical and cooling history of the porphyry bodies.

Retreat longhole open stoping with backfill is the mining method proposed. This method permits the extraction of the ore at maximum hydraulic radius after backfilling the stopes. The backfill assumed is waste material from mining and fine tailings material. Backfill is required for both stability and environmental reasons, allowing all waste material generated by the mining operation to be redeposited as fill in the mine.

All the mine accesses will be developed in rock mass with good geotechnical conditions. The first 80m of the decline ramp will be developed in basalt before transitioning to breccia.

The stopes derived from the mining optimisation have been used as the basis for the mine design. These stopes define the ore extraction along the ore body. The optimisation considered a cut-off grade of 1.75 g/t Au for the average grade of the material contained within the stope, which permits the extraction at maximum grade and generates a plant feed that produces 4,000 oz per month. A 40m crown pillar to surface from the upper stopes has been allowed.

The mine has its own primary ventilation circuit. Taking into account the various characteristics of the Miraflores Project design, such as the longhole open stopes and ore haulage by trucks on the main ramp, the mine will be ventilated by an exhausting system using surface fans extracting through a VCR raise with a section of 5 x 5 m. This raise, at 336 m in length, will connect the 1,071 mine le ........

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