The current drilling program is the first at Big Springs since early 2017. It comprises 13 diamond drill holes for a total of approximately 2,000 metres. The program consists of infill and extensional drilling of the existing 1.03 Moz Big Springs Mineral Resource1 plus active testing of new exploration targets.
The first two diamond holes at the South Sammy 401 deposit (ZBF003 and ZBF001) have now been completed to the target depth of 132.4 and 168.9 metres respectively. These holes were targeted to follow up high-grade intercepts returned from a drilling program conducted in 2005 and to test extension of the deposit towards the south-east and depth.
Mineralisation at Big Springs occurs as alteration and metals enrichment of carbonate paleozoic rocks with Mesozoic to Cenozoic intrusive events resulting in disseminated gold mineralisation. Intermediate to felsic intrusive dikes were encountered in ZBF001 at down hole depth of 85m to 89m and ZBF003 at down hole depth of 29m to 33.5m; the felsic intrusive dikes are the host rock of the high-grade mineralisation at North Sammy.
Minerals of interest that are observable in diamond core include pyrite, arseno-pyrite, calc-silicates, hematite, limonite, illite, and graphite. Sulphide mineralisation has been observed in ZBF001 within shear zones close to the intrusive dikes at the intervals of 46m to 64m, 68m to 90m, and 105m to 148m. Sulphide minerals content varied in the range of 0.5% to 10% in general. Spotty sulphide mineralisation with contents up to 20% has been observed as well. Sulphide mineralisation was found in ZBF003 at the interval of 32m to 80m, with contents varying from 2.5% to 12.5%.
Massive jasperoid alteration was developed in both ZBF001 and ZBF003 as a result of significant hydrothermal fluids interaction at the down hole depths of 89m and 82m respectively. Argillic alteration is readily identifiable at the intersection of Unit D and the Briens Fault in drill core ZBF001 at the interval of 12m to 23m. As the host to gold mineralisation at South Sammy, the observed presence of this alteration in the core is highly encouraging.
Geological logging and sampling of the drill core is ongoing. Assay results will be released to the market shortly. In relation to the disclosure of visual mineralisation, the Company cautions that visual estimates of sulphide and oxide material abundance should never be considered a proxy or substitute for laboratory analysis. Laboratory assay results are required to determine the widths and grade of the visible mineralisation reported in preliminary geological logging. The Company will update the market when laboratory analytical results become available.
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Tel: +61 8 9481 0389
Email: info@anovametals.com.au
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