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Location: 15 km NE from Vegadeo, Spain
Ground Floor, Regent House Rodney RoadCheltenhamUnited KingdomGL50 1HX
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Gold mineralisation at Salave is related to hydrothermal alteration of the host granodiorite. The highest gold grades are associated with intense albite-sericite alteration with fine-grained arsenopyrite, commonly disseminated as fine needles, pyrite and stibnite. Destruction of the original texture is a major feature of the most intensively altered and mineralised granodiorite. Quartz veins, and quartz-carbonate molybdenite-bearing veins present in the deposit do not contain gold and represent a separate mineralising event. BDG consider the Salave deposit to be an intrusive related gold deposit with similarities to other intrusions related gold deposit models including Fort Knox, Pogo and Donlin Creek in Alaska and Telfer and Boddington in Western Australia. The Salave gold deposit is hosted mainly by the strongly altered Salave granodiorite at its western boundary, close to the contact with the Los Cabos sedimentary sequence.Most of the gold mineralisation has been delineated within an area 400 m wide, 500 m long and 350 m deep. Gold mineralisation occurs in a series of stacked, north-to-northwest trending, shallowly southwest dipping irregular lenses related to faults and fracture zones that are parallel to the contact of the intrusive and metasedimentary rocks. The faults and fracture zones appear to be related to one or more vertical structures some of which contain high-grade gold mineralisation. These structures may play an important role as conduits and opening shallow dipping structures with subsequent deposition of hydrothermal solutions, particularly at the contact with the metasediments.Previous explorers noted that the attitude of the sheeted alteration-mineralisation zones mirrors that of the overlying metasedimentary rocks. In places, these lenses may be sub-horizontal. The dimensions of the individual mineralised zones range from 50 m to 300 m in length, 10 m to 150 m in width, and 5 m to 60 m in thickness, with an average thickness in the order of 20 m. Narrow zones of gold mineralisation are also present within the Los Cabos metasedimentary rocks, possibly reflecting later reactivation and leakage.
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