A large multi-licence project area skirting the south-eastern and southern sides of Lake Torrens is being explored for economic buried deposits of base metals. This area is considered prospective on the basis of known mineral occurrences,...
A large multi-licence project area skirting the south-eastern and southern sides of Lake Torrens is being explored for economic buried deposits of base metals. This area is considered prospective on the basis of known mineral occurrences, proximity to major IOCG deposits, and because of perceived similarities to the geological settings of the Century mine in Queensland and deposits in the Zambian Copperbelt. The positioning next to major regional faults of Cambrian carbonate units capping Precambrian rocks which include black shales is considered a prospective setting for base metals, including copper. A notable feature of the region is the association of copper mineralisation with diapiric intrusions which fringe the Torrens Hinge Zone, as evidenced by abundant historic small scale workings. During the first year of the project, an application was made to DSD for a grant of PACE Initiative Year 9 collaborative drilling project subsidy funds, to drill a test mineral exploration diamond drillhole on EL 5694 located in a proven sealed trap setting near the historic Wilkatana petroleum field. This hole would be collared at a site lying on the regional seismic line 09GA-CG1 (part of the Geoscience Australia 2009 Curnamona - Gawler Deep Reflection Seismic Transect). The geological setting is a prominent anticline, the axis of which runs parallel to a half graben - bounding fault which is likely to provide a conduit for mineralising fluids (intrusive diapir-related metalliferous brines). The anticline's crest stratum at the proposed drill location was expected to be the Cambrian Wilkawillina Limestone, lying at about 300-400 m depth. This formation was regarded as the main target for possible copper mineralisation. The predicted depths of four reflectors that are evident on the seismic section were estimated from seismic velocities, for which there is no tie-in. Given the uncertainties about stratigraphy at the chosen drill site, it was proposed to drill the test hole to a total depth of 750 m. During Licence Year 2 for EL 5694 “Kallioota”, in April 2017 the ownership of Mingoola Gold (and therefore EL 5694) was transferred from Dark Horse Resources Pty Ltd to Lakes Oil N.L. At the time of the transfer of ownership a PACE Grant had been awarded to Mingoola Gold to assist in the drilling of an exploration drillhole along the THZ. Lakes was unable to utilise this grant as the drilling had to commence before the end of the 2016/17 financial year. Lakes was unable to meet this deadline and the grant was forfeited. Exploration Licences 5690, 5693 and 5695 were fully surrendered as of 18/1/2018 [See ENV12988 CNO:2043582]. During Licence Year 3, on renewal of the licence area in November 2018, a partial relinquishment of 48.5% of the tenement area was undertaken on the southern half of the tenement. Due to timing and resource restraints on the parent company Mingoola was unable to satisfy the licence commitments of drilling the proposed cored hole within the required timeframe and this drilling commitment has now been rolled over into the renewal period. During the reporting period further desktop studies were conducted to further refine the proposed location and design of future drilling. During Licence Year 4, the company was again unable to meet licence commitments, due to Mingoola Gold’s parent company Lakes Oil NL focus and available resources being engaged elsewhere. No exploration activities were undertaken. During Licence Year 5, with the arrival of the COVID-19 pandemic in March 2020 Mingoola has been prevented from conducting any further works on the ground due to the ever-changing lock down and border restriction rules affecting the ability of its personnel to enter South Australia from Victoria. Now that the Covid-19 situation appears to be coming under a bit more control discussions are progressing with a potential farminee to get the stratigraphic cored hole drilled in the second half of 2021 to meet the permit obligations. During Year 6, on renewed EL 6606 to the period 25/11/2021, no technical exploration activities were conducted on the ground across the licence due to the inability of the company to access the area due to the ongoing COVID-19 restrictions. Exploration licence EL 6606 was allowed to expire and no work was carried out during the final reporting period to expiry 25/11/2022.
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