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Widespread anomalous PGE intercepts from sparse, wide-spaced historical drilling over the 16.5km extent of the Eastman Intrusion indicate an extensive PGE mineralised system. Historical exploration was focused on the outcropping ~6.9 km length of the intrusive complex, with a bias to evaluating relatively short discontinuous chromitite lenses within the sequence. PGE mineralisation, however, is shown to be stratabound within the ultramafic intrusives, unlike the discontinuous strataform chromite-rich layers.

The Eastman Intrusion is interpreted to extend along strike for approximately 16.5km; divided into an Eastern and Western zone by a granite intrusion. The Eastern Zone extends for ~9.4km with 2.5km under cover and the Western zone for 7.1km, mostly under cover.

The Eastman Intrusion is a layered mafic to ultramafic intrusive complex comprised predominately of pyroxenite, anorthosite and gabbro. The pyroxenite forms the basal unit, with the gabbro and anorthosite overlaying it. The sequence has been variously folded and faulted in places resulting in structural repetition of the sequence. Having multiple layers of the sequence adds considerably to the prospectivity of the intrusive complex.

The Eastman Intrusion appears geologically similar to the nearby northerly Panton and Lamboo Intrusions. The three intrusive complexes each have the same ultramafic-mafic rock types and similar intrusion sequencing. Moreover, historical work at all three intrusive complexes has focused on stratiform chromite layers in the ultramafic rocks. Previous exploration at the Eastman Intrusion, like at the nearby Panton and Lamboo intrusions, focused on the discontinuous stratiform chromitite lenses rather than the wider, more extensive PGE-rich stratabound mineralisation that Peako is targeting, which has become recognised within the mafic-ultramafic layers of the intrusive complex.