Technical Report for the Maricunga Gold Mine - Kinross Gold

Kinross Gold CorporationMaricunga Mine Technical Reportis cut by fine-grained matrix material that forms clastic-like dikes. These are generally > 2cm in width. They may have been formed as “fluidized” material injected into fractures at thetime of the formation of the unit.8.2 PanchoThe gold mineralization at Pancho is also described as porphyry style mineralization. Itoccurs within a sequence of intermediate tuffs, porphyries and breccias that are the hostrocks to the gold mineralization. Lithological interpretation based on the recent 2006 drillprogram has identified six major lithologic units. These are from older to younger rocks:• Hornfels – They represent less than 5% of the total volume. They were identified atdepth in the Pancho porphyry system. They are present in a series of elongatedbodies, sub-horizontal and intercalated with intrusive breccias and dioritic porphyry.The hornfels are also characterized by widespread intense silicification.• Diorite Porphyry - Rocks hypabyssal that represent 60% of the volume of the Panchointrusive complex. It is the most frequent host of mineralized A, B and T veinlets.The diorite porphyry also shows signs of being intruded by a smaller intrusive phase.The porphyry displays obvious porphyry texture with 20 to 40 % phenocrysts.Phenocrysts alteration pattern include biotite or hornblende being completed alteredand replaced by assemblages of chlorite-quartz-sericite-magnetite-hematite. Atdepth the porphyry clearly shows potassic alteration.• Intrusive Breccias – The intrusive breccias represent approximately 15% of thevolume of material in the Pancho complex. They are generally elongated and subhorizontal.These breccias are characterized by their fragments of dioritic porphyry.The fragments vary in size for mm to several cm within a matrix which is normallyfine-grained. The intrusive breccias are a significant host of gold mineralization withA, B, T veinlets.• Diorite Porphyry (2) - This diorite porphyry is defined as a small body identifiedbetween two drill sections and found at depths ranging from 300-400 meters. 400 m.In theory, it intrudes the main porphyry but in turn is intruded by the PMI. It is verysimilar to the main porphyry body in terms of mineralogy, alteration andmineralization. The main difference observed is its primary biotite that is partiallyaltered into chlorite. It also has less veinlets than the main diorite porphyry.• Dioritic Post Mineral Intrusive – The Post Mineral Intrusive (PMI) identified at Panchois not a PMI in a strict sense as there is some very low-grade mineralizationassociated with it.• Volcanic Breccias – Found in the upper portion of the deposit they representapproximately 15 % of the volume of material explored to date at Pancho. Thevolcanic breccias are normally sub-horizontal and discordant with the other unitsdescribed.36