Julcani is a large polymetallic deposit in Central Peru, which principally produces silver that presents mainly as sulpho-salts in many mineralogically complex veins. They are hosted in dacite domes, tuffs, breccias and other tertiary volcanic rocks. Julcani is a fracture-filling silver-bearing epithermal deposit with Ag-Pb-Bi-Cu-WO3 mineralization, hosted in a complex of dacitic/rhyolitic domes from the Tertiary. The most important system of structures runs NW-SE, followed by E-W and NE-SW. It is important to note the zoning, wherein the central part (Tentadora dome) exhibits an Au-Bi-WO3 ensemble that changes to Ag- Pb toward the edges. Historically, the most important mines have been Herminia, Nueva Herminia, Mimosa, and Manto. The Acchilla and Estela Mines are currently in operation. The minerals present include tetrahedrite, argentite, silver sulfosalts, galena, sphalerite, and chalcopyrite, with gangues of siderite, pyrite, barite, silica, and calcite.

Over the course of its history, it has had several areas of exploitation. Operations are currently underway at Acchilla and Estela, where there are eight levels, with the highest being 420 and the lowest being 710. The shafts are located in Acchilla. Exploitation is carried out using the conventional overhand cut and fill method. The waste is recirculated to the pits, and the excess material is transported to the barren material deposits on the surface. Mine water drainage is performed using pumping stations located near shafts 487 and 993, with maximum flow volumes of 120 l/s. There is an acid water treatment plant at Acchilla, with a capacity of 180 l/s. The mining method used in this operation is cut and fill, for which the primary equipment employed are pneumatic shovels, and locomotives. The mine is currently deepening the mine at level 710 operating with synergistic equipment such as electric shovels, jumbo jets and battery powered locomotives.

At Julcani, the ore enters via hoppers and is sent to the washing mill, the crusher, and then to the bar and ball mills. The process continues in the flotation cells, thickener, and press filter. Finally, a silver-lead-copper-gold concentrate is obtained, while ore with low metal content is disposed of in the Acchila tailings pond.

The plant has a rated capacity of 585 tons per day. Water for operations in Julcani is obtained from mine drainage (that must be previously treated with lime), from seasonal streams and a small lagoon.