The Toromocho deposit is located in the core of the Morococha mining district.

The Toromocho copper-polymetallic deposit is a complex, mineralized assemblage of veins, veinlets, stock works, “manto-type” bodies, and disseminated sulfides of the general “porphyry copper” type mineralization hosted in both intrusive and contact metamorphic units with well-zoned mineralization and alteration characteristics in the Morococha mining district. The skarn-type copper-polymetallic mineralized bodies are controlled mostly by the contacts between the Tertiary-age intrusives including diorites, granodiorites, quartz, monzonites, and quartz porphyries and Jurassic-age calcareous host units of the Pucara Formation. Broad areas of the deposit are brecciated with various levels of intensity. The breccia texture crosses all rock types in the central portion of the deposit.

The mineralization of the Toromocho deposit is well zoned. The metal zonation crosses rock type boundaries although the skarn units are better hosts than the intrusive. The deposit shows well developed concentric silicate alteration along with the metal zoning. There is a central potassic zone with secondary biotite, quartz, and pyrite that is surrounded by a phyllic zone with quartz and sericite.

The outer zone is propylitic with epidote, chorite, calcite, and sphene. The wall rocks of the Toromocho deposit include several intrusive phases of the regional plutons, and at least two phases o ........

The Toromocho Mine is a conventional large scale open pit mine. The ore and waste rock is drilled and blasted prior to excavation by electric rope shovel excavators. The ore is loaded into ultra-class diesel powered off-highway rigid dump trucks (Cat’ 797) and hauled to either stockpile, or dumped directly into the primary crusher. The waste rock is hauled to the western waste dump. The mining fleet is owned and operated by Toromocho Mine.

Blast hole drilling operations at Toromocho are conducted using three large electric Pit Viper 351 blast hole drilling rigs. The drills are capable of drilling up to a ± 20 m depth as a single-pass at 350 mm diameter with some 56.7 t of bit loading. All blast holes are loaded with bulk emulsion explosives that are mixed on site by the local explosives contract provider. The blasting contractor supplies all explosives and blasting accessories for each blast. Blasting patterns in the Skarn and Hornfels is on a 6.9 x 8.0 m staggered pattern. The Potassic material is much harder than either the Skarn or Hornfels and achieves optimum fragmentation at a 5 × 6 m staggered pattern.

The main loading fleet at the Toromocho Mine are the three 35 cu.mt rope shovels (Cat’ 4795) supported by a large Le Tourneau 2350 Front End Loader (FEL). The large FEL provides some degree of blending capability and a fall-back loading capacity.

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