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Since early 2013, ongoing soil sampling has been conducted on 1 to 2 km spaced lines and 100m spacing between the lines.
Since then, over 70000 samples have been collected with various phases of infill sampling down to 25m by 25m just prior to drilling. Unlike in Western Australia the soils represent residual insitu primary geology and multi-element geochemical signatures strongly represent their fresh host rocks beneath.
Figure 1: Regional nickel in soil image showing the location of the key nickel prospects found with this technique to date.
The Zn image Figure 2 shows both the Pamwa anomaly plus a large area of strong anomalism in the north east generally known as the Ayuu Alali anomalies.
Figure 2: Regional zinc in soil image showing the location of the key zinc prospects found to date.
The data is plotted against known mineral and rock associations (Figures 3, 4 and 5) to determine whether the anomalies detected have potential economic significance.
Figure 3: Plot of Ni vs Cr showing association of mineralised mafic/ultramafic rocks from Sipa’s Kitgum Pader project.
Figure 4: Shows the “normal plot” of global rocks where Ni plots against MgO. Akelikongo soils and rocks show enrichment to the normal plot and hence are “fertile”.
Figure 5: Plot of Zn vs Pb where red is the Pamwa mineral system with a strong Zn Pb association and the black is the rest of the data.
The effect of infilling anomalies prior to drilling can be key to discovery where dispersion in the soils is low to non-existent.
During 2017 a program of litho geochemical sampling was conducted to determine the relationship of the various known mafic to ultramafic intrusions within the project area. Figure 6 below shows the location of these areas and some of the accompanying prospect names.
Figure 6: Areas of litho-geochemical sampling ultramafic and mafic rocks with selected named prospects.