The Hylea Cobalt Project is located over units of the western side of the Lachlan Orogen, one of a number of orogens in Eastern Australia, the 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; an important group includes porphyry Cu-Au and related mineralisation associated with Ordovician to Early Silurian magmatic arc units of the Macquarie Arc.
A number of Alaskan-Ural intrusive centres have been recognised, including Tout, Owendale, Hylea, Bulbodney and Nyngan, which occur along a NNW trending line.
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; significant areas of the Hylea Cobalt 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 which highlight the general paucity of drilling; as such the intrusive is considered under explored.