Geological Modelling To establish appropriate geological continuity a lithological model was defined for the dominant units, namely: alaskite (leucogranite); calcsilicate; biotite schist and gneiss. The majority of the uranium mineralisation at Rossing South is hosted within alaskite with some mineralisation in the calcsilicates and biotite schist, generally proximal to alaskite contacts. In determining grade continuity, the mineralisation model for the Rossing South deposit was based upon a nominal 75 ppm U3O8 mineralisation halo. The geological and mineralisation constraints were generated based upon sectional interpretation and three dimensional analyses of the available drilling data. Structural data collected from orientated core holes was used to help guide the geological model, along with recently acquired, detailed, first vertical derivative total magnetic intensity data. The main lithological contacts (e.g. alaskite and sediments) were considered at the time of grade modelling and used to guide wire framing of mineralisation shapes. Unless a strong geological model could be established, mineralised zones which did not have more than two drillhole intersections, on two consecutive sections were not reported. The Rossing South deposit (Figure 4) was modeled as 23 distinct zones (3m to 114m downhole thickness, averaging 19m) with a NNE trend. Individual zones were modelled to extend for up to 2,000m along strike. The deepest zone of mineralisation defined thus far is 478m below surface. Due to the geometries of the mineralisation, the true thickness of the mineralisation ranges from 60% to 100% of the down hole thickness. Figure 5 shows a typical sectional interpretation with the drillholes coloured by assay grade. The uranium mineralisation is still open along strike to the south and down dip. The mineralised domains at Zone 1 are generally conformable to the structure of the host rocks (Figure 3). These zones strike N to NE and have a moderate to steep easterly dip.
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