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Location: 90 km S from Port Hedland, Western Australia, Australia
Level 2, 146 Colin StreetPO Box 884PerthWestern Australia, Australia6005
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The Pilgangoora pegmatite deposit is one of the largest hard rock lithium deposits in the world. The Pilgangoora pegmatite district is located within the East Strelley greenstone belt, approximately 30 km east of Wodgina. Three principal pegmatite groups or domains are identified in the centre of the project area: Eastern, Central and South. Pegmatites of the principal domains have a strike length of up to 1.4 km, and mostly range in thickness from 1-30 m, although pegmatites in the Central domain may be up to 70 m thick. Two outlying pegmatite groups, Monster and Southern have strike lengths of up to 350 m and 500 m respectively. Pegmatites strike sub-parallel to the dominant north-northwest trending fabric of the greenstone belt with variable dips ranging from shallow to subvertical to the east. The pegmatite domains at Pilgangoora are composites of several intrusive phases emplaced sequentially over the duration of the late-stage Turner River orogeny. Lithium grade in the pegmatite domains is subject to two main influences, one primary and the other secondary. The primary ore types comprise mainly coarse spodumene, K-feldspar and quartz, and the abundance of spodumene relative to the other two gangue phases is likely the main control on grade variations in zones grading better than 2% Li2O.The main modelled mineralised domains are hosted in an area stretching 8,500m (north-south from Lynas Find and Monster down to South End), ranging between 50-1,500m (east-west) in multiple veins and ranging between (minus) -550m and 220m RL (AMSL).The mineralisation dips between 20 and 60 degrees at a dip direction between 050 and 115 degrees for the majority of the domains. The Monster zone strikes 040 to 045 degrees and dips moderately to the south-east. In the Lynas area the pegmatite varies between horizontal and 50-degree dip towards the south and south-east.Ngungaju (Altura Lithium)Pilgangoora Lithium Project occurs at the southern end of a zone of pegmatite intrusive dykes within the synformal Pilgangoora greenstone belt. The pegmatites are hosted within amphibolites which have a mafic and ultramafic volcanic origin. A total of 13 mineralised pegmatites have been identified and these occur as a set of stacked lodes generally striking 010 030oNNE and dipping 25-40oESE. The dykes generally range from 8-14m thick however there are areas where the pegmatites form lenticular pods and are much thicker (up to 64m).Based upon the completed drilling, the pegmatites appear to be confined to a NNE trending corridor which is approximately 1600 metres long (north to south), 550 metres wide (east to west) and 450m deep. Mineralisation is present at surface for some lodes with most mineralised lodes starting from within 10m of surface.The mineralised pegmatites are located approximately 1km east of a granite contact. There are several barren pegmatites located in the zone between the granite contact and the mineralised pegmatite zone. The granite contact and barren pegmatites were identified via sterilisation drilling carried out for the proposed infrastructure and waste dump areas.The reason for this structural and or geological control within the deposit area is not fully understood however the distance from the granite contact is such that mineralisation in the pegmatite is confined to lithium and rubidium (almost wholly reporting in spodumene and muscovite respectively) with relatively low values for tin and tantalum or other associated minerals.
