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Location: 32 km S from La Serena, Chile
250 Southridge NW, Suite 300EdmontonAlberta, CanadaT6H 4M9
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Deposit types found in the La Serena region of northern Chile include massive magnetite, Manto-Style copper-(silver), iron oxide-copper-gold (IOCG) deposits, and copper-gold veins potentially related to porphyry systems. These deposits are found within the early-Jurassic to mid-Cretaceous rocks, and appear to be formed through regional faulting and extension and localized structural systems. Review of the historic literature and a site visit completed by the authors determined that the primary exploration target for the Farellon project is copper-gold veins as each comprise high-grade structures with these metals.The Farellon area lies in the contact zone between regional granodiorite and diorite bodies to the west and north respectively, as well as Cretaceous-aged formations of stratified rocks including volcaniclastic sediments, tuffs, limestones and sandstones. The proximity of the intrusive bodies produced contact metamorphism (hornfels) and metasomatism, resulting in areas of skarnification and strong silicification (Denmark, 2008).The intrusions and subsequent movement produced a complex structural system. The dominant fractures in the stratified rocks and intrusive rocks are orientated between 50° (northeast) and 75° (east-northeast).Secondary fracturing is mainly in an east-west orientation, with sporadic downdropping of the rocks to the south (Denmark, 2008). While the geological map shows much of the Farellon Project area underlain by volcanic rocks at surface, much of the area is actually covered with a thin veneer of volcanic rocks. The main host rocks to the Farellon copper-gold vein structures are altered granodiorite with the vein structures on the property trending mostly 75° eastnortheast.Copper +/- gold vein mineralization on the Farellon Property is found within discrete and laterally continuous east-northeast trending vein systems predominantly in the Cretaceous granite to granodiorite unit. There are three main veins structures that can be traced along strike for 1 to 2 km, the Farellon, Laura and Rosario veins. Mineralization within the Farellon vein structure consists of copper +/- gold, with grades of the reported historic mining averaging on the order of 2.5% Cu and 0.5 g/t Au. The Farellon area veins historically are known for their high-grade copper values.In the Farellon area, the high temperature mineralized solutions, likely emanated from local proximal granitoid intrusive bodies resulting in fracture infill veining within both the intrusive bodies as well as the stratified rock units. The mineralization includes mainly copper (+/- gold), with mainly chalcopyrite, bornite along with significant hematite and magnetite, with minor pyrite and gangue minerals that include actinolite, quartz and apatite (Denmark, 2008). Strong epidote alteration can be seen in the wall rocks and in the veins. The hematite and magnetite content of the veins is often sufficient enough to be produced as an iron by-product by the local miners.
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