Aus Tin’s EL50/2011 is located about 25km west of Waratah and the Mt Bischoff tin deposit in northwest Tasmania. Access to the tenement can be gained via the sealed Waratah Road, which joins the north-south Murchison Highway to the east.
The Heazlewood River Project overlies a mafic-ultramafic complex occurring within the Cambrian volcano – sedimentary Dundas Trough of western Tasmania. The complex is generally dominant in olivine and orthopyroxene cumulates and boninite and low titanium-bearing tholeiitic basalts.
Heazlewood River Complex can be divided into two lithological and geochemically distinct regions.
Region A – encompasses the Nineteen Mile Creek-Fentons-Warners Creek area and covers the western and northern parts of the complex. Chromite-rich dunite predominates in this area with minor coarse-grained pyroxenite.
Region B – covers the Burgess Hill, Brassey Hill and Gabbro hill areas in the central parts of the complex. The rocks in this region comprise mixed lithology peridotites which are commonly plagioclase bearing. Chromitite rich zones are hosted in serpentised harzburgite and coarse grained orthopyroxenite.
Mineralisation was first discovered in the Heazlewood area in the 1890s, when nickel mineralisation was discovered at the Lord Brassey nickel mine. Other known prospects include several copper and lead-zinc prospects, as well as numerous alluvial and hard rock osmiridium workings. The Heazlewood Complex supported the world’s largest supplier of osmiridium during the early 1900s.
Past exploration work over the project area has reported nickel sulphide breccia at Fenton’s Knob containing up to 1.4% Ni (Avebury Style), surface rock chip values up to 18.3 g/t Au, 15% Pb, 8% Cu and 4.7% Ni and costeans at Fenton’s prospect returned up to 6m at 6.7ppm Pt and 9m at 4.0 ppm Pt. Although there has been considerable exploration in the area, several prospective targets remain grading from >3,000 ppm and up to 5,600 ppm Ni over a 1km strike length.
Several companies have explored the area in search of PGEs and nickel mineralisation since the 1960s. The most significant work was conducted by AMAX who explored the area for PGE and nickel mineralisation in the late 1960s. Metals Exploration Ltd also explored for PGE and nickel mineralisation in the late 1980s and Bass Metals who held the ground for nickel-skarn type mineralisation analogous to the Avebury system.
Aus Tin intends to commence an exploration program to follow up previously reported historic results by third party exploration programs and to exploit the prospective, under-explored areas of the tenement.