Open file company exploration information, released since the previous exploration review (McCallum, 1998) on the CURNAMONA 1:250,000 mapsheet area [note: this scale of mapsheet has its name conventionally written in capitals], is reviewed in this report. Base and precious metal exploration during this period has been led by Rio Tinto Exploration Pty Ltd, BHP Minerals Ltd, MIM Exploration Pty Ltd, and Lynch Mining Ltd. The most significant exploration was done by Rio Tinto, who focussed its efforts on the southeastern portion of CURNAMONA in areas of moderately shallow basement. This work sought all metals, with a number of anomalous zones of Cu, Zn, Pb, Au, U, W and Bi being defined by a combination of surface geochemical sampling, ground EM, magnetics, gravity and drilling. These include: - Hunter's Dam area (investigation over the previously discovered Hunter's Dam Prospect) - Zn-Pb-Ag stratiform sulphide mineralisation at the transition from the Ethiudna Sub Group to Strathern Group. Best intersections included 16 m @ 3660 ppm Zn, 890 ppm Pb, 2.4 ppm Ag and 4.5 ppm Tl from 126 m. - McLennon's North Prospect - Cu-Au-Mo-(Bi, W) within magnetite bearing metasediments of probable Ethiudna Sub Group, proximal to a granitic intrusion. Mineralisation is related to hydrothermal K-feldspar - quartz - haematite - biotite sulphide veining. Best values include 22 m @ 525 ppm Cu + 0.209 ppm Au (including 6 m @ 1250 ppm Cu, 0.755 ppm Au) from 117 m. - McLennon's Syncline Prospect - Zn-Pb-Ag in interbedded psammopelite and pelite of the 'Upper pelite suite' (upper Strathearn Group). Best results included 21 m @ 960 ppm Zn, 150 ppm Pb and 1.6 ppm Ag from 177 m, and 8 m @ 1800 ppm Zn and 199 ppm Pb from 153 m. - KR4 prospect - U as fine to very coarse-grained davidite in quartz veins within banded quartz-feldspar psammite, quartz-feldspar-biotite-muscovite gneiss and granite. Other anomalies that were targeted corresponded to remobilised mineralisation in a shear zone within granite-migmatite lithologies, and at the Ethiudna to Strathearn Group transition. BHP Minerals Ltd with Lynch Mining Ltd, concentrated on the eastern portion of CURNAMONA in areas having more limited previous exploration and with moderately deep cover. The mineralisation models targeted included mineralisation in the 'Bimba Formation' identified as being comparable to parts of the Mount Isa Block Western Succession, large scale structures reflecting primary growth faults, iron-oxide Cu-Au (Olympic Dam style), Cambrian carbonate - hosted mineralisation (Mississippi Valley type), stratiform Pb-Zn-Ag (Broken Hill, Mt Isa), porphyry Cu-Mo-Au, and endoskarn style mineralisation. Anomalous values were returned for most targets. Best results included: - 10 m @ 0.49% Cu from 130 m and 2 m @ 0.88% Cu, 0.2g/t Au and 64 ppm Co from 201 m, interpreted as being low-grade supergene Cu-Co mineralisation. - A weak mineralised zone in the Bimba Formation was intersected including 40 m @ 0.17% Pb and 0.15% Zn from 240 m. This zone was interpreted as a continuation of the Polygonum prospect mineralisation. - A drill hole targeting a geophysical anomaly intersected anomalous Cu, Pb, Zn, As, Ag and Mo in Cambrian limestone, suggesting the potential for MVT style mineralisation on the western flank of the Benagerie Ridge (Brewer, 2000). Exploration for sedimentary 'roll front' style uranium constitutes a considerable proportion of the historical exploration that has been carried out on CURNAMONA. The most significant work released during the current review period was done by Paladin Resources NL. It included the re-evaluation of all existing drilling data which led to a new interpretation of palaeochannel locations, as well as enabling an evaluation of their prospectivity for sedimentary uranium throughout CURNAMONA. Of particular interest was the definition of the Oban, Oban North and Lake Charles prospects. The Oban prospect uranium occurrence was shown to have a near-economic grade and tonnage, although additional, closer-spaced drilling is deemed as necessary for accurately assessing the economic potential. In other work reported by Paladin, the uranium potential of the Lake Charles, Erudina, Wyambana and Stickhole palaeochannels was highlighted (Hogarth, 1999).