Carawine’s Oakover Project, located in the highly prospective Eastern Pilbara region about 100km east of Nullagine, is centred on the Proterozoic Oakover Basin and is considered prospective for copper, cobalt, manganese and iron.
Oakover and Paterson Project tenement location plan
Western Star is located on the western side of the Oakover Basin. Detailed geological mapping and rock chip sampling by the Company’s geologists identified several mineralised trends of high-grade copper mineralisation in breccia and vein stockworks hosted by dolomite, exposed in outcrop and in historic workings. Rock chip samples of this mineralisation have returned assay values ranging from 0.03% up to 43.7% Cu, and 7.8ppm up to 1,436ppm (0.14%) Co (see ASX announcement dated 19 December 2017 for further details).
Western Star Prospect - copper breccia (left), copper vein stock work in stromatolitic dolomite (right).
Mapping has also identified a number of manganese outcrops away from the main area of historic copper workings. These have returned assay values ranging from <0.1% to 53.8% Mn, with cobalt values ranging from 244ppm up to 1,122ppm (0.11%) Co (associated with manganese assay values above 25% Mn). The Company considers cobalt-manganese mineralisation such as that identified at Western Star, and elsewhere within the Oakover Project (e.g. Xmas region - see ASX announcement dated 26 March 2018) as a potentially significant new cobalt-manganese district: both important feedstocks for the growing global battery market.
Western Star prospect plan showing drill targets, modelled IP anomalies, outcrop geology and summary of rock chip assay results
To date the Company has completed two dipole-dipole induced polarisation (IP) ground geophysical surveys at the prospect. In total 9 lines for 14.5 line-km of IP were completed, with the results increasing the potential for copper, cobalt and manganese mineralisation identified at surface to extend at depth. Together with results of rock chip sampling and geological mapping, six high-priority targets have been identified for drill testing.
Further details on Western Star can be found in the Company’s ASX announcement dated 28 August 2018.
In the Xmas Prospect Region the Company has identified significant outcrops of cobalt-manganese mineralisation over one kilometre of strike at its Xmas prospect, where historic rock chip sampling returned results of up to 0.31% cobalt. The work confirmed those outcrops as the source of a large surface cobalt lag anomaly and indicated its potential as a possible new cobalt occurrence (see ASX announcement dated 21 December 2017 for details). A further review of historic data from the area and reprocessing of airborne GEOTEM geophysical data, focusing particularly on work by previous explorer CRA Exploration (“CRAE”) identified a number of new large and highly anomalous cobalt-manganese lag anomalies with associated high-grade rock chip samples.
The Company has secured additional tenure over 130km strike length of the prospective host units and cobalt-manganese lag anomalies in the area, with three new tenement applications increasing land held under granted and application exploration tenements in the Xmas region to over 1,160km2. The next stage of exploration planned for the Xmas region will comprise field mapping and geochemical sampling at each lag anomaly with the objective to identify and define associated surface mineralisation. Further evaluation, modelling and prioritisation of GEOTEM anomalies is also planned (see the Company’s ASX announcement dated 26 March, 2018 for details).
Xmas region cobalt-manganese targets