Assay results include: 422 m @ 0.48% Cu, 0.61 g/t Au & 2.9 g/t Ag (1.00% CuEq) (from 198 m); including 132 m @ 0.71% Cu, 0.85 g/ Au, 4.3 g/t Ag (1.45% CuEq) (from 220m); Including 80 m @ 0.6% Cu, 0.77 g/t Au & 3.2 g/t Ag (1.30% CuEq) (from 468m).
As previously reported, hole PIU-01 was designed to extend Cu-Au mineralization to depth on the southwestern margin of the Piuquenes Central porphyry. Drilling intersected the mineralized intrusion at a downhole depth of 198m as predicted. Supergene copper enrichment was observed from 220m to 380m downhole, coincident, and overlapping with primary mineralization from 350 meters. Strong primary mineralization associated with intense porphyry A type quartz stockwork veining is evident from 350m to approximately 650m. From 650m to the end of hole at 867m quartz veining and mineralization continues, becoming progressively less intense with depth. From 830m disseminated hematite/specularite-pyrite-chalcopyrite mineralization is hosted in volcanic host rocks outside the porphyry intrusive and remains open at depth.
Geology and Mineralization - Diamond Drillhole PIU-01
From surface to 198 m, PIU-01 intersected a fine-grained quartz diorite porphyry with evidence of Intermediate argillic alteration and secondary biotite. Sporadic quartz stockwork veining with disseminated oxidized sulfides are observed from 80 m, becoming more frequent from 150 m deep, coincident with intermineral potassic alteration and anomalous gold values.
Moderate porphyry A-type quartz stockwork veining is present from approximately 150m downhole, increasing in intensity from 220m depth. Supergene copper enrichment is evident from 220m to 380m depth, partially coincident (from 288 m depth) with increasing intensity of porphyry A-type quartz vein stockworks and evidence of intermineral potassic alteration. A narrow zone of copper oxides is observed from 220 - 229m downhole.
Dense porphyry A-type quartz vein stockwork with chalcopyrite and traces of disseminated bornite mineralization hosted in potassic altered diorite porphyry was intersected from 350m to approximately 650 m downhole. From 650m to approximately 740m a zone of moderate intensity quartz veining with lower grade copper-gold mineralization was intersected. Sporadic quartz veining thereafter remains open from 740m to 867m (EOH). From 730m intermediate argillic alteration is present, as is molybdenite, sphalerite and hematite/specularite associated with grey sericite-chlorite veining and fine-grained disseminated chalcopyrite-bornite. From 830m the host-rock is volcanic, superimposed by sericite-chlorite alteration and disseminated hematite/specularite-pyrite-chalcopyrite mineralization, veining and breccias.
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PIU-01 drill hole was collared with a PQ drill bit, reduced to HQ and, sequentially, to NQ as the drill hole progressed deeper. Drill core was extracted from the core tubes by the drill contractor under the supervision of
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