The Mabel Creek Ridge, which is situated adjacent to the central eastern margin of the Gawler Craton, is an ENE trending ridge of shallowly covered basement rock which displays high magnetic and gravity relief. The ADI Round 1 work proposal submitted to DEM by Petratherm suggested conducting there a programme of high risk deep drilling that aimed to test the ridge's fertility for iron oxide - associated copper-gold (IOCG) style mineralisation. Targets for the drilling would include several semi-coincident gravity and magnetic anomalies located ~50 km east-northeast of Coober Pedy, which appeared to be spatially associated with major crustal faults/weaknesses that might have controlled the formation of possible IOCG style mineralisation occurrences. Information about basement lithologies in the Coober Pedy and Mabel Creek Domains has come primarily from mineral exploration drilling. It has revealed that the basement rocks local to the project area comprise Archaean to Paleoproterozoic metasediments which have been intruded by syn to post-tectonic intrusive igneous bodies. Later, widespread sedimentary cover sequences were deposited during the Mesozoic and Cenozoic, and due to this, basement outcrop in the region is now restricted to just the south-eastern sector occupied by the uplifted Mount Woods Domain tectonic entity, besides a single known outcrop of gneissic granite at Fitzgerald Dam. Prior to the start of the ADI project drilling, Petratherm had acquired regional and infill gravity surveys over its Mabel Creek Project acreage, beginning in 2019. Three separate regional surveys were conducted which identified 40 anomalies. Detailed infill surveying was undertaken over 21 of these to provide data which would allow for doing 2D and 3D gravity modelling, to aid the ranking of targets and the programming of test drillholes. An initial diamond drilling campaign was conducted during March to mid-April 2020. It tested 4 high priority gravity targets on EL 6333; Area 2, Area 3, and two features of the Area 5 anomaly. Encouraging results were seen in hole MCDA5-01 put in at Area 5, on the eastern flank of a strong magnetic feature and into the upper portion of a deeper gravity anomaly, which encountered pervasively altered granitic rocks having IOCG type hydrothermal haematite enrichment plus sodic-calcic moderately intense alteration, that are overlain by a lamprophyric intrusion which is also haematite-enriched, and which more importantly contains atypically high concentrations of light rare earth elements (LREE). For the ADI project drilling, which occurred over the period March to June 2021, Petratherm tested another five high priority gravity targets with a single hole at each, for a total penetration of 2096.1 m. These holes, either vertical or steeply inclined, were rotary mud precollared to the top of crystalline basement, at which point NQ diamond coring was started. A total of 878.2 m of drill cores were cut within the five holes. All of the drill cores were spectrometrically scanned using portable XRF equipment (571 scans made), and 69 selected 4-metre hole interval drill core samples were laboratory assayed. 26 selected core samples were examined in petrographic thin section, with some additional mineragraphic observations made. At the Area 5 target, the T5-02 and T5-03 anomalies were drilled. Steeply angled hole MCA5-04 tested a magnetic anomaly of high intensity lying immediately east of the earlier MCDA5-01 hole. The top of basement was reached at 148 m, after which the hole was diamond cored to TD 379 m (downhole depth). The cored section comprises a weakly to moderately altered, highly magnetic porphyritic granitoid rock, which had been intruded by numerous felsic and mafic dykes. From detailed petrological examination it is classed as a medium to coarse grained massive granodiorite, which displays albite-chlorite-haematite alteration. Haematite dusting/veining is responsible for the dull reddish colour of altered plagioclase. This rock has a moderate enrichment in LREE averaging >350 ppm throughout the hole, but no copper or precious metals occur with the alteration. Steeply angled hole MCA5-03 tested a prominent residual gravity high, which overlaps a low order magnetic anomaly. This hole reached crystalline basement at 160 m and then was diamond cored to TD 397.1 m (downhole depth). The basement core is dominated by foliated amphibolite (meta-basic rock), thereby accounting for the gravity anomaly. Weak albite-chlorite-haematite alteration is present throughout, but no metal concentrations of any significance occur. At the Area 15 target located on the north-western side of EL 6405, vertical hole MCA15-01 tested a discrete combined magnetic and gravity anomaly, T15-01. The hole reached crystalline basement at 215 m depth, and then was diamond cored to TD 402.8 m. The basement comprises mafic gneiss, which accounts for the gravity anomaly, and this rock embodies magnetite-rich horizons at deeper levels, thus explaining the magnetic anomaly. No appreciable alteration or mineralisation is present. Petratherm has concluded that its drilling to date has identified low levels of copper anomalism occurring in flanking positions within metasedimentary units on the edges of the main gravity anomaly features. The core zones to these gravity anomalies are dominated by intrusive igneous bodies. The Area 5 granite is iron-rich, contains a lot of LREE, and is relatively undeformed, which suggests that it may be a late stage Hiltaba Suite intrusion. Therefore age dating of this granite is warranted. The company is now considering undertaking IP / EM geophysical surveying over these broad and complex gravity anomalies, and also at other as yet undrilled gravity anomalies, to see if the flanking where affected metasedimentary sequences may have chargeable or conductive responses which might denote contained sulphide accumulations, in the hope that taking this approach could act as a more effective targeting tool.