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Location: 40 km SW from Tabuk, Philippines
Lvl 9, MJ Tower Fort, McKinley Business Park, 20th Dr. cor. 21st Dr., BGCTaguig CityPhilippines1635
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The Philippines is one of the most richly endowed Cu-Au regions of southeast Asia, which hosts the MCB copper-gold deposit, classifi ed as a porphyry deposit. The mineralisation is hosted in a series of overprinting vein sets and is associated with late stage granitic (tonalite) intrusions. The mineralised veins predominantly occur along the margins of these intrusions at or near the contact with the older surrounding volcanic host rock.Detailed geological interpretation has identifi ed two main structural controls on mineralisation. The fi rst is a steep dipping northeast trending regional fabric which controls the location of the intrusions and the second a series of NNW trending faults which control mineralisation.The geological setting for the Maalinao-Caigutan-Biyog (MCB) copper-gold mineralisation is typical of a porphyry copper + gold + moly deposit as commonly defined in many academic papers (Hedenquist and Lowernstern, 1994; Sillitoe, R. H., 2010. Corbett and Leach, 1997). The mineralisation and associated alteration exist across the contact between the genetically related intrusive body (tonalite) and the surrounding host rock material. In most cases the surrounding host rock is a mafic volcanic, however, in some instances the older (not genetically related to copper-gold mineralisation) intrusive bodies also exists in contact with the younger intrusive resulting in broad sections of mineralisation and alteration within a series of intrusive bodies.There is also evidence at MCB for epithermal vein deposit types which exist within close proximity to the large-scale porphyry copper-gold mineralisation. At this stage only the deposit type identified from the drilling information for MCB is a porphyry copper-gold style.Basalt lava flows make up the majority of the host rocks in the tenement area, which is part of the oldest exposed unit, Basement Complex. This Cretaceous-Paleogene Metavolcanics has been intruded by quartz diorite complex, which in Kalinga, ranges in composition from gabbro to tonalite.A later stage Tonalite intrusion exists throughout the project area and is interpreted to be genetically related to the copper-gold mineralisation at MCB deposit.A dacite flow and dacitic pyroclastic blankets the older basalt host rock and tonalitic intrusive rocks. There are four types of ore mineralisation that were emphasized in the project: - Type 1 - Early high-grade porphyry Cu-Au mineralisation, hosted both in tonalite and basalt. - Type 2 - Mix of high-grade porphyry Cu-Au (Type 1) and high-sulphidation mineralisation (Type 4). Hosted in basalt and tonalites, but with strong Type 1 mineralisation that was partially overprinted by ore Type 4. - Type 3 - Medium grade porphyry-copper - Type 4 - High-sulphidation epithermal mineralisation DimensionsThe copper-gold mineralisation at MCB is typical for a porphyry copper-gold deposit with the geometry of a very thick body, up to 100 meter in true width for the high-grade core and surrounded by over 400 meter in true width of additional lower grade copper mineralisation, as a relatively elongate body which stretches out parallel to the contact between the intrusive tonalite and the host rock basaltic rocks.Away from the central core, the high-grade copper-gold mineralisation extends further as a narrow structurally controlled sheet, interpreted again to be mostly parallel to the tonalite – basalt contact, with some possible extensions extending along interpreted structures which exist in a northnorth-west orientation. Both structural sets are close to vertical, and their intersection points also are very steeply dipping.
