Hylea is located over units of the western side of the Lachlan Orogen, one of a number of orogens in Eastern Australia (Figure 2), the Project geology includes late stage (Stage 4), post orogenic zoned Alaskan-Urals style intrusives intruding into deformed early Early Ordovician sediments of the Girilambone Group with some laterite development.
The Lachlan Orogen is host to a number of mineralisation styles and ages (Figure 2); an important group includes porphyry Cu-Au and related mineralisation associated with Ordovician to Early Silurian magmatic arc units of the Macquarie Arc (Figure 2).
A number of Alaskan-Ural intrusive centres have been recognised, including Tout, Owendale, Hylea, Bulbodney and Nyngan, which occur along a NNW trending line (Figures 2 and 3).
These host the Ni-Co-PGE-Sc bearing laterites, formed by the Tertiary weathering of the more mafic phases, including dunites and pyroxenites; as mentioned previously notable examples are those held by CleanTeq, Australian Mines and Platina in the Fifield district and Scandium Minerals near Nyngan; they may also be prospective for intrusive related Cu (-Ni-Co-PGE) sulphide mineralisation.
The Hylea Intrusive covers an area of some 25km2 and is similar in scale and geology to the other “Fifield” Alaskan-Ural complexes in the region, including Tout and Owendale (Figures 4 and 5); significant areas of the Project are under a shallow veneer of Jurassic to recent cover, thus masking the underlying prospective geology.
The Hylea Intrusive has been a number of phases of work since the 1970’s, however this has not covered the whole complex, and as well assaying of drill samples has been inconsistent – hole collars are shown in Figure 4 and highlight the general paucity of drilling; as such the intrusive is considered under explored.