Technical Report for the Maricunga Gold Mine - Kinross Gold

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Kinross Gold CorporationMaricunga Mine Technical Report7.2 StructureMost of the structural trends affecting the Verde and Pancho deposits are related to fracturesystems rather than fault zones. The dominant trends are north-northeast and northnorthwestfracture systems that can be readily identified at Verde. At Pancho, the dominantstructural trend is northwesterly, reflected not only in mineralized structures but also in late,post mineral structures.One of the main structural features influencing the Pancho deposit is Falla Guatita faultzone. Field mapping suggests that there may be significant vertical displacement on thisstructure. The distinctly higher copper grades and presence of potassic alteration in themain zone suggests that the central portion of the Pancho deposit may have been downdropped. Figure 7-1 is a geological map of the Maricunga Area (after Muntean, 2000).Figure 7-1: Geology of the Maricunga Mine Area34
Kinross Gold CorporationMaricunga Mine Technical Report8.0 DEPOSIT TYPES8.1 VerdeGold mineralization at Maricunga has been interpreted to be porphyry style gold systems. AtVerde West, gold mineralization is centered about an elliptical porphyry plug measuring 175by 100 m and oriented at N30°W. At Verde East, the porphyry plug measures 130 by 80 mand is oriented at N35°E. The porphyries occur within a sequence of intermediate tuffs,porphyries and breccias that are the host rocks to the gold mineralization. Lithologicalinterpretation at Verde has identified six major lithologic units. These are:• Post mineral intrusives (barren)• Mineralized post mineral intrusives• Verde breccia• Dacite porphyry• Dacite tuffs• Laguna tuff (barren)The most favourable ore hosts are the Verde Breccia and Dacite Porphyry units. The daciteporphyry is a volcanic to hypabyssal intrusive rock with 20% to 40% plagioclase phenocrystsin a fine-grained matrix. It contains phenocrysts of biotite, hornblende, and sparse quartz.The unit is the best host for stockwork veining, with some portions containing up to 20%quartz-magnetite ± pyrite veinlets.The Verde Breccia consists of intrusive breccia and/or volcanic tuff breccia. Its geometrysuggests an intrusive origin. The unit consists of breccia with angular to rounded clasts,generally matrix supported. The breccia is generally green to greenish gray, which is one ofthe diagnostic features of the unit. The color of the rock is largely due to chlorite andoccasionally epidote. The fragments range from 2 mm to greater than 2 meters in size.Locally the unit is mostly matrix-sized material with only sparse clasts. Clasts in the unit aregenerally monolithic volcanic fragments, which are often porphyritic with white plagioclaselaths up to 5 mm in length. The unoxidized rock typically contains 0.5 to 1% pyrite. Quartzmagnetiteveinlets are common in the mineralized portions of the unit. In places, the breccia35
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Technical Report for the Maricunga Gold Mine - Kinross Gold

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