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The Lackman Rock project is located in the south of the Yilgarn
Craton in Western Australia.
The craton hosts world class deposits
of both gold and nickel sulphide within contained greenstone belts.
Greatland’s exploration licence application covers almost
40km of previously unrecognized greenstones. Greatland processed
the latest aeromagnetic data and interpreted the location of the
rocks. The project’s location and surmised geology make
it prospective for both gold and nickel sulphide mineralisation.
The central-southern Yilgarn region has produced
significant quantities of gold from deposits in the Marvel Loch,
Forrestania, and Southern Cross areas. It also hosts nickel sulphide
deposits at Lake Johnston, Forrestania, and Ravensthorpe.
The tenement is located over the eastern section
of the Lake Johnston greenstone belt, a 200km long greenstone
sequence that includes mafic, ultramafic, felsic volcanic, and
sedimentary lithologies. The western section of the belt hosts
the Emily Ann and Maggie Hays nickel sulphide mines operated by
LionOre Mining International Limited (now Norilsk Nickel).
No greenstone outcrop has been mapped within the
project area, the majority of the tenement being covered by surficial
deposits. The Archaean geology has been largely interpreted from
aeromagnetic data, satellite imagery, and aerial photography.
Along strike to the north, the stratigraphy comprises
a sequence of metamorphosed mafic and ultramafic rocks with minor
chert and banded iron formation intruded by granitoid. Gold mineralisation
was located here by Billiton (now BHP Billiton) and others but
not followed up.
The major greenstone belts, from west to east
across the southern Yilgarn, are the Southern Cross-Forrestania
belt, the Lake Johnston belt, and the Norseman-Wiluna belt. The
first and last contain significant gold and nickel sulphide deposits.
The Lake Johnston belt is the least well explored of the three
and contains two nickel sulphide deposits. The tenement has potential
to host mineralisation of either commodity.
The Lackman Rock project is located in a
region where gold and nickel is currently mined and represents
an opportunity for Greatland to be ‘first mover’ on
a sequence of prospective rocks that have not been subject to
previous exploration.
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