The Mansala Project (EL22694) encompasses an area of 48km2 to the south of Alahiné.
Visual examination of satellite imagery is incomplete at this time but has enabled several hundred individual artisanal pits and shafts to be identified within clusters of workings spatially associated with areas of ferruginous colluvium and/or eluvium and soil cover. Cleared areas, where no pits or workings could be discerned have also been extensively prospected by artisanal miners. The presence of widespread artisanal mining activity within the Mansala Licence suggested the area is prospective for gold.
Mansala Exploration License showing density of sites attributed to artisanal activity interpreted from satellite imagery. Most sit on ferruginous colluvial and/or eluvial deposits and soil cover. Yellow triangles represent artisanal pits, and shafts. Yellow, irregular-shaped polygons encompass very closely spaced artisanal pitting. Orange areas denote areas of extensive puddling ponds likely close to artisanal mining activity. Red lines are tracks. (Source: Polymetals Resources Ltd).
Systematic exploration of the Mansala Licence commenced in December 2020 in which an extensive program of reconnaissance soil geochemistry was completed.
The programme comprised 8 lines of length 10km and 3 lines of length 8.8km, for a total of 106.4 line-kilometres of traversing. Sampling traverses were oriented (grid) east-west and were spaced 500m apart while B-horizon soils samples were collected at 50m intervals along the traverses. The layout of the sampling program was closely similar to that used for the nearby Alahiné Licence and compositing of adjacent samples was employed to minimise assay costs. However, the analytical method adopted for this survey was quite different to that used for the Alahiné geochemical program. Much smaller samples were collected (200g) and analysed for gold and a suite of 32 other elements by ICPMS following an Aqua Regia leach of a 25g subsample. A total of 1075 samples were submitted for assay to Intertek Minerals Ltd’s Tarkwa facility in Ghana who prepared the samples for final analyses within their Perth, WA laboratory.
The results of the current survey have confirmed that in summary, 5.0 km2 or 10.4% of the area surveyed reported Au values in excess of 40ppb Au. Of particular interest are gold abundances which are illustrated in the figure below. A total of eleven (11) samples returned Au assays in excess of 1,000ppb (1g/t) Au, and include values of 93.98g/t, 6.03g/t, 5.85g/t, 2.91g/t, 2.38g/t and 1.10g/t which are plotted in figure below.
The distribution of these high values appears to mirror topography, which itself is controlled by outcropping lateritic and ferricrete knobs and ridges. The possibility exists that these topographic highs are the product of topographic inversion, where lateritic fill in ancient river valleys becomes cemented with iron oxides and are strongly resistant to erosion. Thus, with ongoing erosion, ancient river valleys might now be expressed as hills and ridges of this resistant material. Potentially, such inferred ancient river valleys may host either hard rock or deep lead gold mineralisation. Artisanal miners have exploited gold shedding from present day topographic highs but have not addressed potential deeper mineralisation within or beneath the hills and ridges.
All these areas require follow up involving geological mapping and assessment of the behaviour of other analytes viz Ag, As, Bi, Co, Ni, S, Te, W and Sb which are known to associate with gold mineralisation in the Siguiri district. Infill soil sampling may also be required prior to selecting drill targets.
Mansala Soil Program. Gold (Au) assays (ppb) superimposed on imaged shuttle topography and 5m topographic contours. High Au values (magenta stars) show a spatial relationship with topographic highs. (Source: Annexure B – Independent Geologists Report)
Also, of interest in the North East Quadrant of the Mansala Licence is an area of elevated topography. This area is geochemically prominent, with anomalous concentrations of Au, Ag, As, Mo, Sb, Fe, Cr, Ti and P present in soils. The significance of these responses is not known but may be indicative of mineralisation at depth. Numerous artisanal workings in this area lend credence to this possibility. Follow up work comprising detailed geological mapping and sampling will be required to identify the source of the anomalism and to site drill holes.
Details of trace element abundances and their distribution are provided in the Independent Geologist’s Report to the Prospectus. Interpretation of this large body of data awaits the results of our planned geological mapping program.
In summary, the Mansala soil sampling program has successfully identified potential targets and areas of interest. These will be followed up and drill tested in the coming field season. Further interpretation of the large body of geochemical data acquired will likely produce additional drilling targets.