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.

During 2019, production was mainly focused on Mary and ML Veins, representing 79% of total production. In the West area, mining started in Huaripamapa Ore Body at SL_1070, the Main Manto at SL_1020 and Galáctico Ore Body at SL_780, contributing with a total of 15% of the production and with a higher contribution of Zn and Ag. Also, in this area, mining is consolidated using the OCF method utilizing Hydraulic backfill.

Works for the pumping system project at Level 1220 were completed, with a 130 l/s capacity that will provide better reliability to the system.

Currently, the extracted ore is treated in three concentrator plants: Victoria, Mahr Tunel and Andaychagua, with a total installed capacity of 11,400 tpd.

Victoria concentrator plant
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. As a result, production from the Victoria plant represented 42% of treated tonnage for the Yauli UEA.

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 circui ........