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 of porphyritic stocks associated with the alteration and mineralization of the Tertiary Toromocho deposit.

The majority of copper mineralization is in the form of chalcopyrite and chalcocite. Molybdenum (moly) and silver are also present as byproduct credits. In the Toromocho deposit, chalcocite is distributed vertically over at least 250m, but some chalcopyrite remains throughout much of this interval. Sequential assays completed by drilling have confirmed this occurrence and provide a sound basis for interpretation of copper mineral species throughout the deposit.

The Toromocho ore body outcrops on the surface at elevations of 4,600m to 4,800m. The copper ore body extends downwards to a flat “bottom” 500m to 600m below the surface. The highest grade part of the ore body lies within a 1.0 km by 2.0 km body of brecciated skarn, surrounding a cupola-like 7-million year old feldspar porphyry and granodioritic intrusive. The ore body contains about 2.5 billion tonnes of plus 0.3% copper resources averaging about 0.5% copper. The primary ore body is over-printed by late-stage, pyritic primary mineralization, clay and serpentine alteration, and supergene chalcocite and covellite enrichment. Spotty and structurally controlled, moderate-to weak, chalcocite enrichment extends from the surface and from the top of dominant sulfides, downward to the bottom of enrichment, 200m to 400m below the present surface. A sulfate zone containing anhydrite disseminations and veinlets occur several hundred meters below the bottom of enrichment.

A significant portion of the original leached capping above the enriched zone was probably stripped by Pleistocene glaciation. The upper half of the enriched zone in many places contains more than 50% leachable copper by sequential analyses. The lower half of the enrichment blanket above the bottom of enrichment and the top of the primary zone is generally only weakly enriched and contains from 15% to 50% leachable copper by sequential analyses.

Metallic minerals in the deposit include chalcopyrite, chalcocite, molybdenite, tetrahedrite, galena, sphalerite, digenite, pyrite, pyrrhotite, magnetite, limonite, malachite, and azurite. Nonmetallic minerals include garnet, diopside, tremolite, epidote, quartz, feldspar, biotite, sericite, chlorite, calcite, anhydrite, chorite, calcite, and sphene.

The Toromocho deposit will be mined using conventional hard rock open pit methods. The mine will deliver 117,200 tpd (42,778 kt/yr) of sulfide flotation ore to the primary crusher and will generally move 260,274 tpd (95,000 kt/yr) of total material to assure sustained availability of the mill ore.

Mine equipment has been selected to meet the production requirements of the mine plan. The size and type of mine equipment is consistent with the size of the project. Electric-cable shovels with 35.2 m3 dippers are paired with 345 tonne haul trucks to meet the total annual production requirements of 95 to 99 Mt/yr.

There are zones of the Toromocho deposit that have elevated arsenic grades in the form of enargite (Cu3AsS4). In order to assure that the concentrate is marketable, high-grade arsenic material is not sent to the plant but is stockpiled. This material is stored permanently and not processed, although process options may exist for this material in the future.

The Group plans to employ a semi-autogenous grinding mill/ball mill/flotation processing plant that is standard for the industry, with a designed average daily production capacity of 1,838 tonnes of 26.5% copper concentrates over the 36-year life of the mill and a separate molybdenum hydrometallurgical plant with a designed average daily production capacity of 25.1 tonnes of molybdenum per day over the life of the mill. Based on the planned production capacities described above, the Toromocho Project has an estimated mine life of 32 years and an estimated production life of 36 years.