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Pamwa Zinc and Lead

At the Pamwa base metal prospect, located 10km south of Akelikongo, drilling has previously intersected primary sphalerite and galena in lithostratigraphic horizons within a large >2km elongate Zn, Pb Ag, Cd, Mn soil anomaly.

A total of 22 aircore holes for 534m and 3 RC holes for 202m were drilled during April 2016. (Figure 1 and inset Figure 2).

The program consisted of shallow RAB and RC drilling of many highly anomalous soil peaks >500ppm Zn + Pb. The assay results indicate broad zones >25m of strongly anomalous zinc plus lead (>1000ppm), silver and cadmium, with thinner higher grade zones 1-7m wide of up to 3.9% combined Pb plus Zn and up to 20 g/t Ag.

The mineralised zones generally occur around a stratigraphic contact in biotite hornblende gneiss beneath a garnet gneiss see Figure 3. As described previously, the soil anomaly is thought to represent a folded or thrust repeated horizon and the drilling confirms this view. It is thought that the eastern limb dips shallowly to the east whilst the western limb is overturned and dips more steeply to the east. The wider and better grade zinc, lead and silver intersections are located on the eastern limb.  
 

Figure 1 Figure 1: Pb plus Zn in soils with strong anomalies labelled with number and outlined in red with drill hole locations.

Figure 2 Figure 2: Plan inset of PAM003, showing section line A-A’

Figure 3 Figure 3: Section A-A’ PAM003

 

Figure 4Figure 4: Plot of all drill hole assays Pb vs Zn. Points coloured by prospect number.

Figure 4 above shows an XY plot of all assays for the current Pamwa drill program. It clearly shows all samples are anomalous and are located within the mineralised system with a strong correlation between Pb and Zn at all levels of anomalism. The best mineralised results come from soil anomaly PAM003 (red).
Gradient Array IP data collected in December 2014 shows a strong chargeability zone correlating with the eastern and western fold limbs and extending further to the south east than the geochemistry and drilling. Strong >60ms Pole-Dipole chargeability anomalies were also detected on two sections across this area however, the diamond drill holes drilled in 2015 did not satisfactorily explain these anomalies.
 
This current drilling program has assisted with the further understanding of the controls of the mineralisation. More drilling is likely if further geophysics can assist with targeting with this extensive mineral system. The existence of a pyrite halo to the mineralisation indicates further IP lines would be beneficial. It’s also planned to conduct further gravity data here and at Akelikongo which will also assist targeting.