The Narnoo Project consists of three groups of tenements (E39/1683 and E39/1401, E28/2096 and E28/2097, E39/1687 and E39/1689) located on the margins of the Eucla Basin – which flanks the south-east Yilgarn Craton. The total area of the Narnoo Project is around 880 km2 (Figure 7).
Sediments on the margins of the Eucla Basin are prospective for uranium as demonstrated by the presence of the Mulga Rock Deposit consisting of the Emperor (24.14Mt @ 500 ppm U3O8 for 26.39 Mlb contained U3O8 at a 200 ppm U3O8 cut off (ASX: EMA Release 13 January 2009)), Shogun (3.96 Mt @ 590 ppm U3O8 for 4.76 Mlb contained U3O8 at a 200 ppm U3O8 cut off (ASX: EMA Release 13 January 2009)) and Ambassador Deposits (27.6 Mt @ 469 ppm U3O8 for 28.4 Mlb contained U3O8 at a 200 ppm U3O8 cut off (ASX: EMA Release 11 June 2010)). These deposits are uranium-bearing, poly-metallic mineral deposits hosted by fluvial and estuarine sediments sourced from the Yilgarn Craton.
The extensive sand cover resulting from eroding beach ridges on the Eucla Basin margin masks the radiometric signature of uranium deposits within the prospective sediments. This means that radiometric data are a poor guide to uranium prospectivity in this region. Radiometric data are shown in Figure 7 and it is apparent that there are no radiometric anomalies associated with the known deposits. The Company carried out a ground gravity survey over parts of the Narnoo tenement package in mid-2012. It is planned to extend the survey to the entire tenement package. The data will be used to focus exploration activity by mapping concealed palaeodrainage lines and related sediments and identifying targets for follow-up drilling.
Figure 7. The Narnoo Project tenements are shown relative to the margin of the Eucla Basin, inferred palaeodrainage lines, known uranium deposits and U2/Th anomalies.