Oklo’s Socaf permit covers 224km2 of a sparsely outcropping inlier of Birimian volcanics interpreted as a northern continuation of the regional scale Senegal-Mali Shear Zone (“SMSZ”).
Although the SMSZ is now well explored along its southern extent, manifested in the form of several world-class gold deposits including Sadiola (13.5Moz), Loulo (12.5Moz) and the recent discovery of Fekola (7.1Moz), the prospectivity of the northern extension is poorly understood. As such, the potential for additional discoveries is considered high.
Drilling in 2007 and 2008 to assess several geochemical targets, resulted in a small gold resource being outlined at the Nreilat prospect. However, 94% of these holes were less than 40m in depth. Significant intersections included 8m at 4.1g/t gold and 8m at 3.5g/t gold. The Nreilat resource remains open and to a large extent constrained by the shallow depth of drilling and inadequate testing of the controlling structures.
During 2016, Oklo completed further bedrock auger drilling and limited RC drilling. The auger drilling program targeted structural zones identified from induced polarisation (IP) geophysical surveys undertaken during 2015. These structural zones are located to the immediate south and west of the previously defined gold-in-soil geochemical anomalies and are mostly concealed under sand cover.
Three zones of coherent gold anomalism were outlined by the auger drilling associated with the interpreted IP structures. Nine of the reconnaissance auger holes intersected >0.5g/t gold including peak results of 3m at 1.58g/t gold, 3m at 1.49g/t gold, 3m at 1.64g/t and 3m at 1.36g/t gold. The Socaf gold geochemical anomaly now covers an area of approximately 2.0km by 1.0km and remains lightly tested by drilling.
The RC drilling program tested the continuation of gold mineralisation intersected in previous drilling and targeted high resistivity anomalies outlined from the IP survey. Significant intersections included 13m at 2.58g/t gold, 4m at 1.31g/t gold and 6m at 1.33g/t gold. Further drilling is required to firm up the geological controls to the known zones of bedrock mineralisation and further test the potential of the soil, auger and IP anomalies.