The Yarlbrinda and Yerda Shear Zones of the central Gawler Craton, partly present within EL 3107 in the Tarcoola-Glenloth-Lake Harris region, were the target for a number of mineral exploratory drillholes put down there by by licence farminee Minotaur Exploration, with funding assistance given from PIRSA through its PACE Initiative Year 2, Theme 2 programme. Minotaur's exploration strategy was to assess if gold mineralisation, similar in character to that known at the Tunkillia Well deposit located 7 km south of EL 3107, might also be present in similar structures lying to the north. EL 3107 incorporates a 50 km strike extent of the Yerda Shear Zone and also the junction of the Yerda and Yarlbrinda Shear Zones. These shear zones are up to several kilometers wide, with entrained Archaean and Palaeoproterozoic volcanosedimentary and plutonic rocks that have been subject to ductile shearing and deformation occurring before ~1600 Ma. At the Tunkillia Well deposit, host rocks which lie within the Yarlbrinda Shear Zone are sheared Palaeoproterozoic Tunkillia Suite lithologies, where gold and associated pyrite occur in steeply-dipping quartz veins surrounded by an alteration zone comprising sericite and chlorite. The mineralization is most likely related to fluids emanating from a Hiltaba Suite granite that were preferentially focused along the Yarlbrinda Shear Zone. The initial PACE project proposal submitted by EL 3107 licensee Range River Gold had planned for 36 RC holes totalling 4320 m to be drilled, principally at the Old Well and New Well prospects. Hover, PIRSA approved a funding grant of only $80,000, significantly less than what was applied for. In order to ensure all priority targets could still be drilled, Minotaur modified the programme to include both RC and aircore drilling. In total, 88 aircore holes were drilled (aggregating 5088 m) in several sorties undertaken between September 2005 and February 2006, and 8 RC holes (totalling 1597 m) were drilled in March 2006. The RC drilling was undertaken on combined geochemical-structural targets, while the reconnaissance aircore drilling was undertaken on 'wildcat' structural targets. The drilling intersected a variety of lithologies, including strongly deformed and altered rocks (mainly granite and granitic gneiss, plus lesser mylonite, mafic dykes, an ultramafic diatreme, felsic volcanics and ? granodiorite). Alteration styles noted included: 'red-rock' hematite alteration, chlorite-carbonate alteration, silica alteration, sericite alteration and minor sulphide (pyrite) alteration. Aircore drilling returned several anomalous (>50 ppb) gold assays from six of the holes, including 4 m @ 0.632 g/t from the depth interval 48-52 m hole GLAC086, highlighting the gold potential of a previously untested splay of the Yerda Shear Zone. Here the anomalous gold occurs in saprolitic clays near and at the weathered rock-fresh rock interface, above a hematite-altered gneiss. Interestingly, this interval also returned the highest zinc (765 ppm Zn) and copper (291 ppm Cu) assays of the programme. RC drilling of geochemical-structural targets did not return significant gold assays, thus indicating that the surface geochemical (calcrete) anomalies may not be in-situ, but could have been transported away from their basement sources. All base metal assay values were similarly very low. Logging of the RC drill chips indicated, however, that the key structural targets were successfully intercepted.