Las Opeñas Gold

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Project overview

  • 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

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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.

Exploration Results for the Las Opeñas Gold Project including existing drill holes (blue) and gold grades (multi-coloured dots). The gold porphyry system is in the lower left and marked in yellow, and the epithermal gold system in the upper middle part of the figure. Dark Horse’s planned new drill holes (yellow and black) are also shown.

Exploration Results for the Las Opeñas Gold Project including existing drill holes (blue) and gold grades (multi-coloured dots). The gold porphyry system is in the lower left and marked in yellow, and the epithermal gold system in the upper middle part of the figure. Dark Horse’s planned new drill holes (yellow and black) are also shown.

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