An area located just north of the Trans Australia Railway, between Malbooma and Lyons sidings, has been explored for possible economic secondary uranium mineralisation that could exist in Proterozoic and Tertiary strata overlying known uraniferous Archaean/Palaeoproterozoic granitic basement rocks. EL4570 contains the Warrior Palaeochannel, which was discovered and explored by Nissho-Iwai Company (Aust) Pty Ltd and then PNC Exploration (Aust) Pty Ltd (PNC) between 1973 and 1987, and consequently is known to contain significant, widespread redox front style sedimentary uranium mineralisation developed within Eocene lignitic sediments. These sediments were deposited in a palaeovalley system incised into the granite basement. During the 1970s and the 1990s, Dominion Gold and Webster’s Find Gold undertook calcrete soil geochemical sampling, and followed up two low-order gold anomalies with drilling programmes, without being able to upgrade the prospects. In the 1980s Nissho-Iwai and PNC did interpretive work and conducted large drilling programmes over the current licence area, focussing especially on the palaeochannel in a search for economic roll-front style uranium mineralisation. After it had purchased EL 3372, Stellar reviewed the previous uranium exploration work, and in December 2005 flew a HoistEM airborne electromagnetic survey across the entire licence consisting of 27 east-west lines at 500 m spacing, to try to better define the palaeochannel. This was followed up by an aircore drilling programme aimed at testing selected AEManomalies and interpreted aeromagnetic features. 4 vertical holes with a total penetration of 109 m were drilled by Stellar during May 2006 within the now relinquished portions of the licence area. No Tertiary sediments or mineralisation were encountered, and no significant downhole sample assay values were returned. Toro Energy, when it came along as joint venture partner, further reviewed and refined the previous data, and undertook a substantial aircore drilling programme during 2007/2008, with most of the drillholes concentrated within two palaeochannel zones of anomalous uranium which had been disclosed in the PNC work but not followed up. Overall, the drilling was directed at delineating the palaeochannel system and assessing the economic potential of the uranium bearing Tertiary palaeochannel sediments, by establishing the distribution, grade and continuity of mineralisation within the channel profile. Toro withdrew from the JV after its work so directed remained inconclusive, such that the company was unable to upgrade the resource of known uranium mineralisation to a sufficient size and grade to meet its requirements. In addition, Toro found that it was unable to finalise an Indigenous Land Users Agreement with the State's Far West Coast Native Title claimant group. No field work has been done on the licence area since the Toro drilling. The three now relinquished licence sub-blocks, together totalling approximately 10 square km, lie outside the extent of the presently interpreted palaeochannel system, and contain only thin Quaternary sedimentary cover.