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Aurania confirms new discovery that extends Tiria-Shimpia to 22 km
Outcropping mineralization in the first reconnaissance exploration in this new area gave a grade of 40 grams per tonne (“g/t”) silver in an extensively weathered gossan (iron-rich residue that remains after intense weathering of sulphide-rich rock) and, among other samples, a boulder of barite in a stream returned 19g/t silver, 6.5% lead and 1.1% zinc.
Aurania’s Chairman & CEO, Dr. Keith Barron commented, “Shimpia North appears to have the same character, style and mineralization type as Tiria-Shimpia, though it is displaced to the northwest. I consider it to be part of the same system. This may be the distal expression of the copper/silver -in-sediment system we have traced further to the south across country for 23 kilometres. In any case, the Cutucu is proving to be a rare case of a metal-rich basin, that though uplifted and exposed has appeared to not be eroded to significant extent. The siliceous sinters we find at Kuri-Yawi are evidence of the original land surface in the Jurassic, when we expect the mineralizing event took place. What I find astounding is that Cretaceous and younger cover rocks have been stripped off to just the right erosional level to expose mineralization. Otherwise, we would never have guessed it was there. Equally significant, our very large land parcel has allowed us to piece this story together. If we had had a postage stamp type parcel, we never would have guessed the magnitude of these mineralizing systems. Serendipity has worked in our favour.”
Rock-chip and stream sediment sampling that highlights the extent of the mineralized zone, corresponds closely with high potassium detected in radiometric data from the Company’s geophysical survey completed in 2017. The potassium enrichment feature extends approximately 10 km beyond the area investigated so far (Figure 1), providing an invaluable exploration guide to finding possible further extensions of the mineralized system. Though it is not yet confirmed, it is believed the potassium mineral is langbeinite, a potassium magnesium sulphate which could potentially occur with the other sulphates like barite, celestite, or gypsum. The Company has commenced selection of drill sites at the Tiria-Shimpia target area and expects to begin drilling in this quarter.
Geological Details of the Area Sampled at Shimpia North
The mineralization is sediment-hosted, found parallel to the sedimentary layering in limestone intercalated with sandstone. Hard rock samples contain galena (lead sulphide) and sphalerite (zinc sulphide) with barite (barium sulphate) and celestite (strontium sulphate). Gossan, weathered rock in which the sulphide minerals have been removed by oxidation to leave an iron oxide residue, has also been encountered. Although zinc and lead would have been leached out of the gossans, these residues allow us to map out the original extent of the sulphide-rich layers at surface, which could guide us to fresh, sulphide-rich rock below the weathered zone as illustrated in Figure 2.
Sample Analysis & Quality Assurance / Quality Control (“QAQC”)
Laboratories: The stream and rock samples were prepared for analysis at MS Analytical (“MSA”) in Cuenca, Ecuador, and the analyses were done in Vancouver, Canada.
Sample preparation: The rock samples were jaw-crushed to 10 mesh (crushed material passes through a mesh with apertures of 2 millimetres (“mm”)), from which a one-kilogram sub-sample was taken. The sub-sample was crushed to a grain size of 0.075mm and a 200-gram (“g”) split was set aside for analysis.
The stream sediment samples were wet-sieved through a 20 mesh (0.84mm) screen in the field and placed in cloth bags so that excess water could drain. The samples were transported from the field to Aurania’s field office in Macas, Ecuador and batched for delivery to at MSA in Cuenca, for drying and screening at 80 mesh (0.18mm sieve aperture). The -80 mesh silt was packaged by MSA for analysis.
Analytical procedure: Approximately 0.25g of rock pulp or -80# soil underwent four-acid digestion and analysis for 48 elements by ICP-MS. For the over-limit samples, those that had a grade of greater than 1% lead and zinc, or 100g/t silver, 0.4 grams of pulp underwent digestion in four acids and the resulting liquid was diluted and analyzed by ICP-MS.
Stream sediment: a 0.5g split of the -80 mesh fraction of the stream silt underwent digestion with aqua regia and the liquid was analyzed for 48 elements by ICP-MS.
Apart from being analyzed by ICP-MS, gold was also analyzed by fire assay with an ICP-AES finish.
QAQC: Aurania personnel inserted a certified standard pulp sample, alternating with a field blank, at approximate 20 sample intervals in all sample batches. Aurania’s analysis of results from its independent QAQC samples showed the batches reported on above, lie within acceptable limits. In addition, the labs reported that the analyses had passed their internal QAQC tests.
The geological information contained in this news release has been verified and approved by Jean-Paul Pallier, MSc. Mr. Pallier is a designated EurGeol by the European Federation of Geologists and a Qualified Person as defined by National Instrument 43-101, Standards of Disclosure for Mineral Projects of the Canadian Securities Administrators.
Aurania is a mineral exploration company engaged in the identification, evaluation, acquisition and exploration of mineral property interests, with a focus on precious metals and copper in South America. Its flagship asset, The Lost Cities – Cutucu Project, is located in the Jurassic Metallogenic Belt in the eastern foothills of the Andes mountain range of southeastern Ecuador.
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