In 2014, 2,866 meters were drilled in nine diamond-drill perforations from inside the mine aimed at intercepting the Mary Vein, to delineate new inferred resources with 70 x 70 meter grids at 200 meters below 1,070 level (3,960 masl). The boreholes also intercepted the Ramal Mary and Tensionales veins with positive results in terms of polymetallic mineralization, mainly zinc. The ore potential in Manto Principal has been confirmed with favorable results. Principal has been confirmed with favorable results.

The Carahuacra Norte Pit was halted in 2018.

(Translated from Spanish by Google Translate)

Extracted ore is treated in two concentrator plants, Victoria and Andaychagua, with an installed capacity of 8,650 tpd. The Mahr Túnel plant with a capacity of 2,750 tpd is in care & maintenance.

Victoria concentrator plant
The Victoria concentrator plant has an available processing capacity of 5,300 tpd. During 2021, the zinc flotation flow sheet was modified to implement the RCS-100 and RCS-30 cells in the Rouger, Scavenger and Cleaner circuits, with the aim of improving the recovery and increasing the quality of the zinc concentrate.

The following recoveries were achieved: zinc 94.5%, lead 83.3% and silver 87.0%; in 2021, which represents an increase in zinc by 3%, silver by 2% and a decrease in the lead by 0.4% compared to 2020.

Likewise, the silica content in zinc concentrates was reduced, which made it possible to reduce the probability of penalties in the sale of concentrates.