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In September 2016, a 600 m deep drillhole intersected altered porphyritic monzonite with narrow intervals containing up to 0.16% Cu and 0.47 g/t Au; four 300 m inclined holes are proposed to be drilled during 2017 to test their refined target, in an area 1 to 2 km NW of Nankivel Hill (Investigator Resources 2017b).
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.The significance, however, for gold exploration in a previously unrecognised hydrothermal mineralising system with possible links to extrusion of the Gawler Range Volcanics was clearly established.A subvolcanic epithermal mineralisation model was developed by Aberfoyle geologists as a focus for exploration on northern Eyre Peninsula and the southern margin of the Gawler Range Volcanics.Investigations to determine the age of alteration at Nankivel Hill were initiated following preliminary petrology and scanning electron microscopy (Fig.
3) that reconfirmed the alunite was a primary alteration phase and probably suitable for dating by K and is able to diffuse from a mineral lattice over geological timeframes provided the mineral is above a ‘closure temperature’ for diffusion.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).