There are two types of deposits in the San Cristobal district, veins and mantoso Veins are roughly perpendicular to the axis of the Chumpe Anticline and mantos are emplaced along the Mitu volcanic rocks-Paria limestone contact.

The San Cristobal Vein system is made up of two main mineral-bearing structures, the San Cristobal Main Vein and the Siberia 1 Vein, The Oyama-Triunfo Vein, which is located on the northeast limb of the anticline, appears to be an extension of the San Cristobal Main Vein, Both veins are separated on the surface by Chumpe lake and no underground workings exist below the area that permit a clear correlation.

The San Cristobal Main Vein extends all the way along the San Cristobal fault, considering the Oyama-Triunfo Vein as its extension. The Siberia 1 Vein is located in the axial zone of the anticline# At present the San Cristobal mine is working in the San Cristobal Main Vein.

The newly found Ticlio Cu-Au porphyry prospect is a single granodiorite intrusion showing a pronounced zonation pattern with respect to mineralization and alteration. Its central part is characterized by the occurrence of high density quartz-magnetite±K-feldspar stockwork. The zone rimming the core shows strong K-feldspar alteration with low-density magnetite and quartzmagnetite veining. This zone hosts small amounts of chalcopyrite and bornite as disseminations and in veinlets.

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 Yauli unit is located in the Junín Region, 40 kilometers from the city of La Oroya and 170 kilometers from Lima, and it is accessible by road and rail.

The unit consists of four underground mines and one open pit, from which the ore is treated in three concentrator plants.

In 2015, Andaychagua mine continued the preparatory work for long-hole drilling in the high zone (Recuay), which resulted in a 400 tpd production increase, for a total of 3,400 tpd of mine capacity. Also, work was completed on the water-pumping system infrastructure for the deepening of the mine, making it possible to develop levels 1170 and 1200. Work was completed on replacing two pumps used for delivering cemented fill at the Central mine, raising cemented-fill placement capacity from 11,000 m3/month to 16,000 m3/month. In addition, the fill-delivery pipes were replaced and two substations were installed inside the mine to improve the reliability of the system and to secure the energy-supply system in the mine-deepening zones. Finally, during the year various improvements were made to the accommodations for personnel.

As for mine expansion work, 5,377 meters of mine development was completed, as well as 7,600 meters of sub-level preparation and exploitation. Finally, 582 meters of ventilation shafts were raisebored.

In 2014 the Ticlio Mine achieved production of 1,200 tpd, thanks to an increase in preparation of the Ramal Techo vein, where 50% of the production was obtained through long-hole drilling. In addition, improvements were made to pumping systems in the lower levels of the mine and six raise borer chimneys were built for the ventilation and services systems. Ore extraction was resumed at the Ariana body using the ascending cut-and-fill method, which allowed for better control of the stability of limestone rock.

At the Carahuacra Norte Mine, work included stripping necessary to reach 1,000 tpd and extend the operating life of the open pit. The Company carried out preliminary evaluations in preparation for increasing the level of resources and reserves.

At the same time, a total of 6,936 meters of new ramps and bypasses were developed, along with 15,867 meters of preparatory works and exploitation of sub-levels, as well as 881 meters of raisebore shafts for ventilation. Finally, the mine continued employing the hydraulic fill method, using classified-tailings backfill.

During the year, mine development and preparation work increased with a view to raising production and reaching 2,500 tpd capacity. In order to achieve this goal, an intense campaign was conducted consisting of developing ramps and accesses to three different ore veins. 100% production was obtained using long-hole drilling methods.

Currently there are four underground mines operating: San Cristóbal, Carahuacra, Andaychagua and Ticlio, whose extracted ore is treated in three concentrator plants: Victoria, Mahr Tunel and Andaychagua, with a total installed capacity of 11,400 tpd.

Victoria
The operation of the Victoria concentrator plant is automated, including Courier online analysis systems and a control system that regulates the ratio of water to ore during the milling process. It is worth highlighting that the Victoria concentrator plant can separate low-grade lead and copper concentrates by flotation.

During 2019, the capacity of the Victoria concentrator plant to process 5,200 tpd was maintained.

Selective zinc flotation was implemented, eliminating 100% of the use of lime in the flotation process, thereby lowering the flotation costs, lowering the ratios of the main reagents (CuSO4 from 0.38 to 0.34).

Copper flotation in the bulk circuit was improved, reducing ........