Excitingly, recent detailed field work at
Over the last three years, at Valiente Hannan has discovered a Miocene-age porphyry-epithermal gold-copper mineralized belt that extends over 150 km by 40 kms in area, located in central-eastern
Highlights
The first exploration work reported from the
Two styles of gold mineralized boulders have been described so far: 1. Gossanous polymictic hydrothermal breccias and 2. phyllic alteration with thin veins of quartz pyrite and disseminated roscoelite, a vanadium-bearing mica common as a marker in alkalic gold systems and: A second target, Previsto Norte , located 4 km north of Previsto East has also been discovered with copper mineralized boulders. Copper is hosted in fractures and seams within sandstones, porphyritic and phaneritic intrusive rocks with weak propylitic alteration and pervasively leached gossanous dolomite boulders. Further work is being undertaken and Hannan believes the copper in the sandstones is associated with a mineralized porphyry target in the area.
Previously reported initial reconnaissance field work from the third target area, Previsto Central, located 3 km West of Previsto East has identified a large-scale hydrothermal system within a 6 km x 3 km area. This area also demonstrates alkalic porphyry style mineralization with the best float sample assaying 25.6% copper and 28 g/t silver, from an interpreted supergene enrichment zone.
'The initial work at Previsto East is very exciting with such relatively high grades of gold in soil sampling extending over more than 1 km. The anomalous band of soil anomalies is associated with mineralized and high altered rocks that point excitingly to what may lay below the surface. Field teams are active within the area collecting further exploration data as we continue to unravel the opportunities at
Geological Discussion
The 100% owned Valiente project is in central eastern
The
This exploration took place over a period of a few weeks in 2021. Exploration was temporary put on hold while Hannan invested further in social licensing within the area and technical teams became more focused at the Belen area, located 25 km to the SW. Belen consists of another porphyry copper-gold and epithermal gold mineral cluster (
Since September, surface exploration has shifted to expanding into new areas of the
17 soil samples over 1,200m strike ranged from below detection to 0.4 g/t Au in thick scree cover and averaged 0.1 g/t Au. These initial values are considered to be highly anomalous.
Two styles of gold mineralized boulders have been described so far: o Gossanous polymictic hydrothermal breccias. o Phyllic alteration with thin veins of quartz pyrite and disseminated roscoelite, a vanadium-bearing mica common as a marker in alkalic gold systems, was present throughout most samples, selectively replacing feldspar phenocrysts and in fractures and veinlets associated with pyrite and trace chalcopyrite.
Rock chip grab samples (11) ranged from 1.6 g/t Au to below detection limit and averaged 0.27 g/t Au and ranged from 0.2 g/t Cu to below detection limit and averaged 0.1 g/t Au. Trace elements associated with the mineralization were V, Ag, Te, Mo, Zn.
According to USGS Alkalic epithermal deposits from some of the largest epithermal gold deposits in the world. Considered a subset of low-sulfidation epithermal deposits, they are spatially and genetically linked to small stocks or clusters of intrusions containing high alkali-element contents.
Separately, a third target at Previsto Norte is emerging 4 km to the north. Here copper mineralized boulders have been discovered. Copper is hosted in fractures and seams of sandstones and within the same area porphyritic and phaneritic intrusive rocks with weak propylitic alteration, with pervasively leached gossanous dolomitic boulders also occurring frequently. Further work is being undertaken and Hannan believes the copper in the sandstones are associated with a mineralized porphyry.
Technical Background
All samples were collected by Hannan geologists. Samples were transported to ALS in
About
Mr. Michael Hudson FAusIMM, Hannan's Chairman and CEO, a Qualified Person as defined in National Instrument 43-101, has reviewed and approved the technical disclosure contained in this news release.
Contact:
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Email: info@hannanmetals.com
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