Las Opeñas Gold
1,462ha lease at relatively low elevation levels for this gold region (between 2,800m and 3,500m)
Region is host to numerous multi-million ounce epithermal style gold-silver deposits including Veladero (12Moz), Pascua Lama (18Moz), Gualcamayo (2Moz) and Casposo (0.45Moz).
Property was previously explored by Teck Resources from 2005 to 2012
Teck carried out a significant amount of exploration and discovered two main, and different, target areas – a breccia target hosting a gold porphyry system in the south-west, and a vein target hosting an epithermal gold system in the central-west
Dark Horse has focussed its initial interest on the epithermal gold system where gold-silver mineralization occurs in high grade veins, vein breccias and stockwork zones, principally in a granite. The quartz vein systems have not been drill tested.
6 major mineralised vein sets, each composed of multiple en echelon veins - which can contain pyrite, arsenopyrite, chalcopyrite and galena and are geochemically anomalous in As-Bi-Mo-W-Sn- Te, target elements of gold-silver mineralisation systems
The Las Opeñas property is underlain by a granodiorite batholith of Lower Permian age which has intruded Carboniferous aged clastic sediments of the Cerro Agua Negra Formation creating a contact metamorphic aureole of quartzites and pelites
The property lies at the intersection of two major regional structures which have interacted to form a structural dilation into which has intruded a younger dacitic dome and breccia complex (a high level porphyry) surrounded by a mineralized quartz vein swarm (an epithermal system) that displays a rotating strike from EW through to NE-SW (Figure 2 below). The Las Opeñas deposit is believed to be an intermediate sulphidation epithermal system occurring in an Oligocene back-arc extension environment.