The Yauli dome is located 100km east of Lima, Peru. The southern portion of the dome is where Andaychagua, Carahuacra, San Cristobal and Ticlio are located, and is made up of mantos and vein-type deposits. The mantos are hosted by the Pucara limestone, while the veins are steeply dipping and cross-cut rocks of the Mitu and Excelsior groups, as well as the Chumpe and San Cristobal intrusions.

(Translated from Spanish by Google Translate)
Carahuacra underground Mine is a part of Yauli unit.

There was an increase in the head grades of silver and lead by 25% and 4%, respectively. However, zinc and copper head grades decreased by 20% and 3%, respectively. The programmed laws were not reached due to the delays in the primary and secondary developments of 2020, product of the impact of the covid-19.

The volume of production contribution was 23% higher than in 2020, due to the contribution of the veins in the main mantle systems, Lourdes, Fátima, Susana and Mary's part. The results of production of fines in zinc, lead and silver were above 2020 by 1%, 29% and 63%, respectively.

In this area, mining is consolidated using the OCF method utilizing Hydraulic backfill.

Seismic events occurred in the Mary vein, which paralyzed its production contribution for a period of three months. In this period the cable installation was implemented bolting and additional support to secure the mine with a greater safety factor.

Diamond drilling exploration was directed towards mantle systems main, Mary, Lourdes, Susana, Manto Poderosa, Fátima and Jazmín vein in the levels 870, 920, 970, 1070, 1180, 1220, 1360. Likewise, on the surface the vein Kindness, where it was possible to recategorize indicated resources to measured ones.

Andaychagua's processing plant include grinding circuit consist of primary ball mills #1, 2 (10.5 'x 14', 8 'x 10') and secondary grinding ball mill (7’ x 12’).

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