The mineral deposits of the Colquijirca district belong to a member of the family of porphyry copper (Cu) related deposits known as Cordilleran deposits. These types of deposits, which are generally formed in the upper parts of a porphyry Cu, are fundamentally characterized by prominent zoning with internal parts that are dominated by Cu and external zones where Zn, Pb and Ag are the main economically-interesting elements. In the case of the Colquijirca district, and specifically the area between the Marcapunta Norte and Colquijirca sectors, such zoning generally consists of three zones, which mineralogically consist mainly of enargite in the internal parts; chalcopyrite in the intermediate parts; and sphalerite and galena in the external parts (El Brocal, 2021).

Due to the advance of stoping over the years, the Colquijirca deposit is currently exposed, which facilitates the geological identification of the Tertiary basin. Asymmetric anticlines and synclines composed of carbonate and detrital rocks, attributed to the Eocene-Oligocene Calera Formation, can be found and considered as the host of mineralization. The deposit also presents volcano-clastic intercalations (ash tuffs), which is evidence of volcanic activity that was contemporaneous to sedimentation. In addition, with the review of 5 drillholes, the Shuco conglomerate sequence of the upper Eocene has been identified in depth, which underlies Lower Calera and overlies in depositional contact with the Mitú sa ........

Tajo Norte, an open-pit operation that produces silver, lead, zinc and copper ores. Open pit operations: 1.Tajo Norte 2.Tajo Sur The following design parameters have been considered for the open pit operation: - Bench height: 6 m. - Berm width: variable between 5 and 8 m. - Ramp width: considering equipment width, safety distances, and safety berm, the open pit have ramp widths of 12 m with a 10% slope. - Optimum turning radius according to the equipment fleet is 6.4 m. - Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20 m. However, one excavator is expected to work with two trucks. As such, the estimated width can be up to 60 m. Open pit mining production: 9,500 tpd (2022 – 2032).

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Plant 2 processes lead and zinc ores to recover lead and zinc minerals with the purposes of producing lead concentrate and zinc concentrate. Plant 2 receives fresh ore from Tajo Norte mine and low silver content ore from Marcapunta. Plant 2 can process copper ores by campaigns, currently a campaign of 30 days by year is implemented in the Plant 2 for treatment of Copper ore.

Plant 2, Lead and Zinc Ore
Plant 2 is a conventional, sequential multi-stage concentrator that produces lead and zinc concentrates that are trucked offsite to be sold to third parties. The plant’s unit processes include crushing, washing, grinding, and flotation. Final tails are thickened and disposed of in a conventional tailings storage facility. Final concentrates are thickened and dewatered before being trucked off site.

Flotation and Coarse Fraction
The 24’ x 24’ conditioning tank receives slurry from the primary grinding stage and feeds the lead rougher flotation cells 1 to 5; ........