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In addition, porphyritic dacite of the Gawler Range Volcanics was also sampled and the K-feldspar phenocrysts dated using the Ar technique.K-feldspar is generally considered to have a lower closure temperature window than muscovite (~250–150 °C).Drill cutting samples (2 m interval) were analysed for Au, Cu, Pb, Zn and As, but the results were not deemed significant at the time (Gerakiteys 1996).In the context of an advanced-argillic alteration system that may host high-sulfidation-style epithermal mineralisation however, these results and in particular the coherent anomalous arsenic results are now considered to be significant as an indicator to possible sites of nearby concealed mineralisation (e.g. Investigator Resources has continued to refine a model for associated Cu–Au porphyry mineralisation at depth.1590 Ma volcanic and plutonic event that formed the silicic large igneous province on the Gawler Craton, but this has proved to be difficult to confirm by direct dating methods.
Total mineral resource at the Paris deposit is estimated at 9.3 Mt at 139 g/t Ag and 0.6% Pb for 42 Moz contained silver and 55 kt contained lead at a cutoff of 50 g/t Ag (Investigator Resources 2017a).Subsequently, these rocks were subjected to high-sulfidation style epithermal alteration.The timing of this alteration is suggested to be c.The epithermal characteristics of the Nankivel breccia were confirmed by petrographic analysis that identified alunite and dickite associated with silicification in strongly altered rock samples (Purvis and Pontifex 1991).In 1996 alteration mapping using a portable infrared mineral analyser delineated zones containing alunite, dickite and pyrophyllite (Gerakiteys 1996); the mineral assemblage is consistent with that found in advanced-argillic alteration systems and commonly associated with high-sulfidation epithermal As–Au–Cu mineralisation (e.g. In joint venture with Mount Isa Mines Ltd, three RC percussion holes (averaging 115 m) were drilled in September 1996 on Aberfoyle Exploration Licence 1841 on the flanks of the hills, close to the margins of blocky siliceous breccia outcrop.