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Location: 91 km NE from Chiclayo, Peru
1133 Melville StreetSuite 3500, The StackVancouverBritish Columbia, CanadaV6E 4E5
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First Quantum Minerals is the operator of the project.
La Granja is a porphyry copper and associated skarn deposit, with high grade breccias with minor silver, and molybdenum.La Granja porphyry copper deposit formed due to subduction of the Nazca plate beneath the South American plate in the Andean Cordillera. The district rocks are mainly a thick sequence of volcanic rocks interbedded with occasional sediments which were intruded by the Pomahuanca batholith. Towards the end of the Cretaceous period, La Granja’s small porphyritic felsic to intermediate stocks were intruded.The deposit has two distinct porphyry clusters, known as Cerro Paja Blanca (CPB) to the east, and Mirador to the west of La Ayraca River. The respective deposits’ lithology and alteration types are similar with their mineralised halos overlapping each other forming “bridge” of skarn material. The deposit is largely circular in shape with a diameter around 2.5 km that decreases with depth. The deposit extents and depth are partially open, with only wide spaced drilling defining current extents.The La Granja Cu-Mo-Ag-Zn porphyry-breccia complex is hosted by several large, composite, Miocene-age intrusive porphyry stocks of dacitic to dioritic composition with numerous associated hydrothermal breccia phases. The rocks in the upper levels of the intrusive porphyry and breccia complexes have undergone extensive sericitic (“phyllic”) alteration, consisting of sericite-pyrite development at the expense of almost all original minerals in the host rock. Beneath the pervasive zone of sericitic alteration exists a large zone of potassic alteration in the form of secondary biotite and lesser K-feldspar development. The potassic alteration appears to have been overprinted and destroyed by the sericitic alteration assemblages. Best hypogene copper grades occur in the potassic zone while supergene copper mineralization is almost exclusively hosted within the sericitic zone. Primary copper mineralization consists predominantly of chalcopyrite intergrown with variable amounts of pyrite. Minor amounts of bornite, digenite, tennantite-tetrahedrite, and enargite are also present. The Cu-As sulfide mineralization is believed to have formed from a later phase of more epithermal-like mineralization and is commonly associated with late-stage quartz veins at higher levels in the system. The secondary enriched zone is deeply penetrating and typically consists of “washes” of chalcocite and minor covellite over abundant pyrite crystals. The greater La Granja system of mineralized porphyry, breccias, and associated skarns defined to date covers an area of at least 3.5 km west-east by 2.5 km north-south, still open below 2,000 m from surface.Recent higher-grade drill intercepts in the Mirador zone suggest a block 2 caving resource potential which may add more than 1.5 Gt at +0.75% Cu at depths from 400 m to 2,000 m from surface. This resource is still open in several directions including at depth.
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Production is likely to be focused on primary copper mineralisation associated with both skarn and porphyry deposits, and which is amenable to processing via conventional mill and concentrator operation. Alternative processing and mining scenarios will be considered.Additional metallurgical studies to establish optimal processing configurations will be carried out in parallel, together with a high-level project layout and configuration of associated infrastructure requirements and logistical routes.
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