Northern Gawler Projects
EL 5718 Robins Rise
EL 4907 Lake Woorong
EL 5154 Muckanippie
EL 4908 Perfection Well
The Robins Rise and Lake Woorong exploration licence areas cover portions of the Palaeoproterozoic Coober Pedy Ridge, an east northeast trending magnetic block of variable magnetic intensity separating the Mount Woods Inlier to the southeast from the Mabel Creek Ridge to the north. These three terranes abut an interpreted Archaean age cratonic area to their south and west. The area contains major regional structures (including the Karari Fault Zone) and is traversed by a several prominent northwest trending structures along which significant thicknesses of Permian sediments have been deposited.
Basement outcrop in the region is generally restricted to the Mount Woods Inlier to the east and southeast of the tenement, and limited outcrop of Gawler Range Volcanics and Archaean Gneisses to the south and southwest of the area.
The metasediments of the Mt Woods inlier are characterised by an intense magnetic response in regional aeromagnetic data, which reflects a combination of magnetite rich precursor sediments including BIFs, magnetite alteration, and interpreted probable mafic intrusive bodies.
Perfection Well 80 km South West of Coober Pedy is prospective for coal. The EL covers 458 square kilometres and target definition in progress.
The Muckanippie exploration licence covers part of the north-western side of the large Malbooma Anorthosite Complex, a large circular intrusion that covers an area of approximately 800 square kilometres and comprises anorthosite, gabbro, diorite syenite, granodiorite and granite. Elsewhere in the world similar anorthosite complexes are host to significant nickel and copper massive sulphide deposits.
Recent non-coal exploration by others was conducted to specifically test for hematite dominant Iron Oxide Copper Gold style mineralisation in an area of the Northern Gawler Craton where little exploration activity has been directed towards this model. Incorporation of the geophysical responses at Prominent Hill and Carrapateena defined areas for detailed gravity coverage which subsequently defined valid drilling targets for hematite dominant mineralised systems. Several of these anomalies were tested with five short drill holes only four of which reached basement. The holes intersected metamorphosed felsic intrusive and metasedimentary rock types overprinted by calc-silicate dominant alteration typical of gold, nickel and base metals terrain and gabbro intrusive amphibolite with retrograde chlorite-pyrite alteration. Only low order sulphide mineralisation was intersected.
WPG considers that in addition to the gold, nickel and base metals potential the Robins Rise Lake Woorong and Muckanippie tenements are also prospective for iron ore deposits similar to those at Peculiar Knob, Hawks Nest and Cairn Hill. Other targets include magnetite in gneissic metasediments and additional sub-bituminous coal in the overlying younger sedimentary formations.
Heavy Mineral Sands Project
EL 5450 Barton West
The Barton West/Notrab heavy mineral sand deposit was discovered by Dominion in 2005 and acquired by WPG through the Challenger asset sale from Kingsgate. It is located in Exploration Licence 5450 (244 square kilometres) in the far west of South Australia, within the Maralinga Tjarutja Aboriginal Lands, who have a beneficial interest of 10% in the project (carried to decision to mine). Whilst the area is very remote, the deposit is located only 10 to 15 kilometres north of the Trans Australia Railway, so logistically it is quite well placed.
Location of Barton West Project and Resource
Initial RAB/aircore drilling at Barton West in 2005 was designed to test a calcrete gold anomaly. In the course of this drilling it was noted that abundant dark heavy minerals were present in unconsolidated sands at shallow depth, immediately recognised as being potentially analogous to recent discoveries by Iluka Resources at Jacinth and Ambrosia.
Within the target Cainozoic sequence, a distinctive stratigraphy is present – though lateral variation is marked. The gross sequence is suggestive of marine transgression followed by regression. In the central prospect area, the Target Sand sequence is dominated by fine to medium and more rarely coarse grained quartz sands. The sands are always very well sorted, rounded and clean washed.
These sands are interpreted as shoreline beach facies deposits and are the principal exploration target. Rapid thickness variation occurs proximal to basement highs, along with greater abundance of heavy minerals. The basement highs are interpreted as headlands or islands at the time of sand deposition and their interaction with longshore drift focused heavy mineral accumulation, similar to that seen at Tripitaka heavy mineral sand deposit. Several strandlines appear to be present and discovery of further zones of significant heavy mineral accumulation is likely within these facies.
Importantly, there is a 3km stretch of high grade heavy minerals (>20m x HM%) on the western side of the deposit that is open to the west. This zone immediately flanks a basement high and extensional drilling is likely to intersect additional heavy mineral accumulations.
Gold potential of the tenement has been subjected to only limited exploration since the Project focus shifted to HMS. Strongly gold anomalous bottom of hole samples (peak 405 ppb Au) at the top of “fresh” bedrock remain beneath a 2km long calcrete gold anomaly that warrant deeper drill testing.