- WMG’s flagship project – the key portion of under-explored Minigwal Greenstone Belt
- Company holds the entire Mulga Tank Dunite Intrusive – a major ultramafic intrusion approximately the same size as the Kambalda Dome
- Significant evidence for working Ni-Cu-PGE sulphide mineral system across ~18km2
- Only 11 historic holes deeper than 200m – nearly all show Ni-Cu-PGE sulphides
- Multiple untested coincident EM, gravity and geochemical anomalies
The Mulga Tank Project comprises exploration licence E39/2132 and exploration licence application E39/2223 covering an area of approximately 113km2. The project is located approximately 190km east-northeast of Kalgoorlie in the Duketon Domain of the Burtville Terrane, in the Eastern Goldfields Province of the Yilgarn Craton, Western Australia.
The project covers the southern portion of the Minigwal Greenstone Belt which is a NNW trending linear sequence of predominately mafic and ultramafic lithologies with a strike of approximately 21 kilometres. The belt is bounded by granite basement rocks to the east and west and has been classified into two domains. The eastern domain consists of faulted granite and gneiss with thrust repeated layered units of greenstones, BIF, and ultramafic to mafic volcanics on the western margin. The western domain, in which the project is situated, comprises structurally controlled, vertically dipping ultramafic and mafic volcanics adjacent to granites in the east and the large Mulga Tank Dunite Intrusion to the south. Subparallel structures and dolerite dykes that trend east-west cross cut both domains. The project area is largely covered by transported sediments, predominately aeolian sands that vary in thickness from 7m to 60m. Consequently, bedrock interpretation is largely based on interpretation of aeromagnetic data and limited drilling.
The Mulga Tank Dunite Intrusion is a key feature of the area, entirely contained with the Company’s tenement E39/2132 and is considered highly prospective for Ni-Cu-PGE magmatic sulphide mineralisation, whilst the rest of the belt, including tenement application E39/2223, is also considered prospective for shear hosted gold mineralisation.
The Minigwal Belt and Mulga Tank dunite were first identified by BHP in the 1980’s yet are still under explored due to sand cover. Most recent exploration by Impact Minerals (ASX:IPT) (2013-2016) demonstrated a working Ni-Cu-PGE magmatic sulphide mineral system, with sulphide intersections observed within 8 diamond drill holes drilled to test several electromagnetic (EM) geophysical anomalies, including 2m @ 1.3% Ni and 0.25m at 3.8% Ni, 0.7% Cu and 0.7g/t PGE. This exciting work, confirming a sulphide mineral system with a parent magma reaching sulphur saturation and precipitating high-tenor Ni-sulphides, enhances the prospectivity of the intrusion – the challenge now remains for WMG to identify locations where significant accumulations of these sulphides may have occurred.
Impact subsequently completed a number of other geophysical surveys including ground gravity, HeliSAM EM, Down Hole EM and high-resolution airborne magnetics to better define the dunite intrusion and drill targets. This work gives WMG an enviable dataset and launchpad to commence exploration from and the Company looks forward to drill testing this exciting project.