Dark Horse Resources Limited (ASX: DHR) has announced new positive discoveries from the exploration at its Las Opeñas Gold Project in Argentina.
The company reported that visible Gold metal and Silver sulfosalts as vuggy quartz fillings were identified in rock chips from a particularly significant Presagio West vein breccia zone.
DHR said that this vein breccia zone contains sulphides, chalcedonic quartz, and vuggy texture and is up to 70 meters in width.
It may be noted that an adjacent vein breccia at Presagio West, which was previously diamond channel sampled, contained 0.8m with 17.9 g/t Gold, 225 g/t Silver, and 1.0m with 2.4 g/t Gold, 597g/t Silver.
Dark Horse reported that it has identified another greenfield vein breccia system discovery in the far north of the lease, named ‘Zora Target’. The company said that over 350m outcropping of breccia were sampled, with more exploration to be done in the coming month.
Las Opeñas project
The Las Opeñas Gold Project is on the border of the Indio Belt, Argentina, where there are multi-milllon-ounce gold deposits including the 12Moz Veladero and 18Moz Pascua Lama.
Dark Horse Resources Ltd, through subsidiaries and contractual rights, holds rights to the Las Openas tenements with Genesis Minerals (Argentina) SA.
DHR’s phase 1 drilling in March-April 2019 had confirmed high grade mineralised zones at Tramway and Presagio vein targets in Las Opeñas.
Presagio is the largest target of Las Opeñas Gold Project to date and has a total strike length of 3.7km. The Presagio System includes the Targets Presagio West, Presagio, Presagio Sur, and Presagio East, along with smaller unnamed veins.
Positive exploration results from Presagio West
The company reported that its geologists have identified visible Gold metal and Silver sulfosalts within Presagio West. The mineralized sulfosalts are vuggy quartz fillings, identified from rock‐chip samples.
DHR said that this is a strong indication of high grade Gold and Silver mineralization. The company reported that samples have been sent to the laboratory for confirmation.
East‐West vein breccia zone
DHR said that the visible Gold and Silver was found in a particular East‐West vein breccia zone at Presagio West, which has a large maximum width of 70 meters.
The company said that this particular vein contains the best development of multiple chalcedonic sulfides. DHR noted that the area is partially covered by alluvial sediment and therefore more breccia and stockwork could be present below this cover.
The vein is partially oxidized with granite clast and vuggy texture and contains Galena (Lead Sulphide), Sphalerite (Zinc Sulphide), Pyrite, and the visible Gold metal and Silver sulfosalts.
The company noted that advanced individual vein breccias with widths up to 7m demonstrate multiple rich hydrothermal pulses, providing a high chance that anomalous Gold‐Silver mineralisation will be discovered at depth in the next drilling program.
DHR reported that further channel sampling is being carried out at this location to comprehensively test the area.
New Zora Target
The company announced another greenfield vein breccia discovery in the far north of the Las Opeñas lease, which has been termed, ‘Zora Target’. Zora is an East‐West vein breccia with similar characteristics to Presagio.
DHR said that over 350m of Zora outcrop breccia was sampled, and more exploration will be undertaken as it is open in all directions.
Dark Horse said that Zora was discovered via satellite image research combined with structural knowledge accumulated from its exploration of the Las Opeñas Property.
DHR reported that a new corridor of more of than 3km has been identified for detailed ground exploration.
The company said that the initial 350 meters mapped to date in the west part of the corridor has shown mineralized breccia (sulfide chalcedonic breccia) with strong Alunite alteration. Now exploration is focused on the eastern part of the corridor.
Dark Horse reported that the Presagio West vein breccias are the next target for drilling at Las Opeñas. DHR said that three priority holes will test the particular vein with visible Gold and Silver sulfosalts.
The company noted that the large area between Zora and Presagio is yet to be investigated, and said that it is planned to be included in its future work program.