The West Arunta Project is a greenfields exploration project located in the Gibson Desert region of Western Australia. Broad zones of anomlous zinc mineralisation have been intersected.
The West Arunta Project, comprising four adjoining Exploration Licences, is located in an area that has had limited previous exploration. Historical data collected by the Geological Survey of Western Australia (GSWA) indicated the existence of a large geochemical anomaly, with elements identified that are commonly associated with hydrothermal gold and base metal mineralisation.
In 2014, Cassini conducted a regional geochemical survey identifying three significant Zinc (Zn) – Lead (Pb) anomalies. Evidence for a major Zn-Pb mineral system presented in both soil and lag geochemical results from the survey. Three large, coherent soil anomalies, identified Zn values up to 10 times background, with supporting anomalism in Pb, Copper (Cu) and Silver (Ag). Coincident Cadmium (Cd) anomalism was present in the lag geochemical results. These lag anomalies are interpreted to lie on a single continuous stratigraphic horizon, referred to as the Dione Horizon striking over 35km. An integrated analysis of the geochemical, geophysical and geological data has resulted in the definition of four discrete prospect-scale targets: Iapetus, Enceladus, Rhea and Mimas.
Figure 1: West Arunta Project - Exploration targets.
An RC drilling programme was also conducted in April 2106 to test for the presence of primary zinc mineralisation below the ferricrete outcrops and soil anomalies at Iapetus and Enceladus. Drilling returned broad zones of sub-surface enrichment in zinc and associated elements within the weathered zone at both prospects. Best results include 22m @ 0.26% Zn from 13m including 2m @ 0.89% Zn from 22m in WAC0007 at the Enceladus Prospect.
Figure 2: West Arunta Project - Enceladus Prospect cross section.
In addition to the Enceladus and Iapetus Prospects, prior exploration work identified the Mimas and Rhea Prospects. There remains enormous potential for the identification of further zinc targets due to the lack of previous exploration and shallow sand cover obscuring the bedrock geology. Cassini has received a co-funded drilling grant to the value of $150,000 to be used towards drilling the Rhea and Mimas Prospects.
The Company is encouraged that the results to date support the geological model which points to a primary source of zinc mineralisation within the project area.