Georgina Basin Project, EL 25089, EL 25091-92, 25094, 25143, 26933, Final surrender report 2012, for the period 7 September 2006 to 20 August 2012

Abstract

Due to various cultural issues, parts of the surrendered ground have been somewhat difficult to explore (particularly EL 25093 and the general Dulcie Range area). The exploration activities that have been carried out (gravity, IP and surface geochemical sampling), failed to detect any significant geochemical anomalies which could likely be associated with a base metal deposit. Although the two completed drillholes (GBD001, GBD003) were essentially stratigraphic in nature, analysis of the drill core, and follow-up inspections of the core at the NTGS Core Library in Alice Springs (XRF and Petrography) has been disappointing, and have revealed no significant sulphide mineralisation. Depths to the target Arthur Creek Formation basal 'Hot Shale' horizon (as seen in Baldwin 1) are in excess of the 600m drilling depths attained. GBD001 may have been terminated within 100m of the target depth, but intersected only minor sulphides (pyrite) between 350-475m within carbonaceous black shales. Minor bleaching within Chabalowe Formation siliciclastics was noted between 150-165m, but this may be supergene. GBD003 also did not reach the target Arthur Creek Formation, and contained no visible coarse sulphides. Pink-orange (possibly hydrothermal) dolomite crystals lining cavities in Chabalowe Formation dolomitic limestone are noted between 200-201m and 286-287. Moderate silicification occurs in mixed siliciclastics and dolomitic limestone between 320-390m also in Chabalowe Formation. Minor hematite veins and patches occur at 453m (with possible jarosite) and also between 525-530m in possible Upper Arthur Creek Formation. There is a general lack of key alteration indicators (veining, brecciation, strong hydrothermal dolomitisation) and also generally low background Zn-Pb values from XRF analysis. Mincor Zinc Pty Ltd and JOGMEC have therefore decided to surrender the ground.