The Western project comprises four tenements located near the boundary of the Marymia Inlier and the Yerrida and Bryah Basins and approximately midway between the Plutonic and Peak Hill gold camps. The project adjoins Sandfire's tenements and is approximately 6 kilometres north west of the DeGrussa discovery.
Historic exploration carried out during the 1990's focussed exclusively on the gold potential. The south eastern tenements have been tested by wide spaced regional RAB drilling traverses, soil geochemistry and surface sampling. The main targets identified during this phase of exploration were two areas of unresolved soil samples anomalies ranging from 15ppb to >70ppb gold. The RAB drilling produced a best intersection of 4m at 0.12g/t gold at the bottom of a hole at the end of a traverse and there has been no further follow up. Surface sampling identified a north easterly trending zone of brecciation that returned up to 876ppm Cu from outcrop. This anomalous zone was confirmed by RAB drilling on lines almost two kilometres apart; two holes reported elevated copper levels to 500ppm at the position of the structure (Figure 2).
 |
| Figure 3 Exploration targets and structures on Lodestar's Western project |
The Western Project is interpreted to be underlain by the Marymia Inlier however the geology is poorly exposed, with large areas covered by alluvium and transported hardpan. The southern boundary of the tenements is located close to the Jenkin Fault, a major fault system that thrusts the Marymia Inlier over the younger Proterozoic Yerrida and Bryah Groups. In the area of Lodestar's tenements the Marymia Inlier is separated from the Narracoota Formation of the Bryah Group by a wedge of strongly deformed schist known as the Peak Hill Schist. The Peak Hill Schist has been interpreted as a strongly deformed equivalent of the granitoid crystalline basement of the Marymia Inlier however the Peak Hill Schist has also been described as containing units of the Karalundi Formation (Bryah Group) which is also known to occur in the region of the DeGrussa deposit. The possible occurrence of Karalundi sediments within the Peak Hill Schist is consistent with the thrust belt model for the Jenkin Fault zone, where structural repetition of the geology occurs across the strike of the sequence. The aeromagnetic features within the Western project are similar to the those observed to the south east across the Narracoota Formation and Bryah Group; prominent north east and north west trending shear zones and faults traverse the project.
These long lived structures are important in the transfer and focus of mineralising fluids into structural and lithological traps.
Exploration Targets
- Soil samples to 80ppb Au remain unresolved
- RAB sample 4m at 0.12g/t at bottom of hole - not tested
- NE breccia zone extending over 2 km: Cu to 800+ppm in rock chips, confirmed by RAB drilling - up to 500ppm Cu
- VTEM: Low amplitude anomalies under cover require follow up