Lachlan Star Limited (ASX:LSA) has obtained encouraging results from recent geochemical sampling at the Koojan Cu-Ni-PGE Project JV with Liontown in Western Australia.
Following recent successful first-pass geochemical sampling, infill and extension sampling has now defined anomalies on the interpreted northern extension of the “Julimar Trend” including:
- Mallory PGE-Gold target defined over a 2km strike length with PGE* values up to 160ppb, and numerous +100ppb PGE. The anomaly is coincident with geologically mapped mafic units and is coincident with strongly anomalous NNW/SSE trending coherent gold anomalism.
- Bourbana Gold Anomaly with values up to 135ppb Au returned and an anomaly extending for over 2km in strike and 2.4km in width.
- New anomalous gold and PGE zones have been defined by wide spaced sampling requiring infill and geological review in the west and south of the JV tenements.
The latest results will optimise planning of ground geophysical surveys including Electro Magnetics (EM) and Induced Polarization (IP) designed to define targets for follow-up drill testing.
The Koojan JV Project abuts the western boundary of Liontown’s 100%-owned Moora Project, where initial Reverse Circulation (RC) drilling has intersected up to 43m @ 1.7g/t Au2 at the Angepena prospect.
The Mallory PGE-gold anomaly is defined by 200x200m spaced samples with several plus 100ppb (0.1g/t) PGE values recorded coincident with strongly anomalous gold, copper and nickel.
The coincident anomalous copper and nickel is interpreted to indicate possible sulphide-related mineralisation. Government geological mapping indicates that the underlying bedrock geology comprises poorly exposed mafic, metasedimentary and gneissic rock units.
The Bourbana gold anomaly is an irregular shaped feature with multiple plus 50ppb Au peaks.
The bedrock geology is obscured by shallow lateritic cover; however, the anomaly is coincident with linear magnetic highs, suggestive of the presence of iron-rich mafic units.
The anomaly requires further geological evaluation including geophysical testing prior to reconnaissance drill testing.
Additional geochemical anomalies have been defined by the extension sampling and require further infill and geological assessment.
The anomalies are coincident with geophysical features observed in the aeromagnetic data and highlight potential for extension.
The geochemical sampling will also be reviewed to ensure that the varying surface geology has been adequately tested, and the geochemical anomalies will be further prioritised with a view for ground geophysical testing including EM and IP surveys.