Predictive Discovery Limited (ASX: PDI) has announced the unearthing of gold assay results of up to 153m at 1.51g/t from DD drilling completed over the NE Bankan discovery within its flagship Kaninko Project in Guinea.
The company announced that assays have been received for the first 5 Diamond Drill holes at NE Bankan, successfully intersecting wide zones of good to high-grade gold in fresh rock, with no reduction in grade at depth.
PDI said that the deepest holes completed to-date extend the zone of gold mineralisation to a depth of at least 150m, remaining open.
Significant intersections included 153m at 1.51g/t gold from 47m (to EOH), including 6m at 10.40g/t gold from 189m (downhole); 78m at 2.58g/t gold from 3m, including 4m at 13.64g/t Au from 75m, plus 14m at 1.60g/t gold from 88m, 17m at 1.63g/t gold from 141m; and 22.2m at 1.51g/t gold from 1.8m, including 2m at 7.65g/t gold.
The company said that assays are awaited for the samples from a further 31 RC holes and 1,168 power auger drill samples.
PDI reported that the Reverse Circulation (RC) and DD drilling are ongoing at NE Bankan with drilling testing depth extensions of the northern portion of the NE Bankan discovery within both the Kaninko and Saman Permits.
The Kaninko Project in Guinea was granted to Predictive in July 2019. Through rapid, targeted low-cost exploration, the Company has progressed it from a greenfields tenement with no known history of past exploration, to a property on which significant gold mineralisation has now been identified.
Significant prospects include Bankan Creek and North-East Bankan Prospect.
In January-February 2020, the Company had completed 3,178m of shallow power auger drilling and 490m of trenching at Kaninko, with better results including 11.90g/t gold from bottom-of-hole Power Auger sampling at the NE Bankan Prospect and 18m at 1.60g/t gold from trenching at the Bankan Creek Prospect.
High-grade results from previous drilling
During March 2020, the Company had completed 24-holes (totalling 1,193m) of angled AC/RC drilling at NE Bankan along seven traverses, testing beneath the better intercepts from the previously announced power auger results.
This produced impressive results from most drill holes including 46m (to EOH) at 6.58g/t gold from 4m including 10m at 26.52g/t gold from 34m; 42m (to EOH) at 2.92g/t gold from 8m; 50m (to EOH) at 1.53g/t gold from surface including 20m at 2.51g/t gold from 30m; 42m at 1.56g/t gold from surface including 30m at 2.07g/t gold from 12m; 20m at 1.35g/t gold from surface; 50m (to EOH) at 1.27g/t gold from surface; 34m at 1.06g/t gold from surface; and 48m at 1.15g/t gold from surface.
Drilling at NE Bankan
The Company is currently undertaking a fully funded follow-up drilling program focused on the recent discovery at NE Bankan consisting of a planned 25,000 metres of RC drilling, 5,000 metres of diamond drilling (DD), and 20,000 metres of auger drilling. The program is ongoing.
Five DD holes completed
PDI said that 5 diamond holes (totalling 956m), KKODD001, KKODD002, KKODD003, KKODD004, and KKODD005, were completed at NE Bankan.
The company said that the diamond drilling program was undertaken by Bays Drilling. All of the diamond drill core was cut and assayed, mostly in 1m intervals, with the samples analysed by fire assay at the SGS laboratory in Bamako, Mali.
The company said that the holes drilled to downhole depths of 180 to 200m, mainly within the gold mineralised zone defined by the initial AC drilling but with one hole (KKODD002) drilled towards the east to test the possible eastern limits of the mineralised zone close to hole KKOAC001.
Predictive reported that the drill holes penetrated through the oxide zone and well into fresh rock with good to high-grade gold intersected below the oxide zone, at depth. The company said that the vertical depth of the fresh rock transition appears to be between 50 and 70m. PDI noted that the gold mineralisation in fresh rock is hosted within intensely altered and pyrite-carbonate-quartz mineralised mafic volcanics crosscut by altered granitic dykes.
Predictive announced that at NE Bankan, the deepest holes completed to-date extend the zone of gold mineralisation to a depth of at least 150m, remaining open.
Significant intersections included KKODD004: 153m at 1.51g/t gold from 47m (to EOH), including 6m at 10.40g/t gold from 189m (downhole); KKODD003: 78m at 2.58g/t gold from 3m, including 4m at 13.64g/t Au from 75m, plus 14m at 1.60g/t gold from 88m, and 17m at 1.63g/t gold from 141m; and KKODD002: 22.2m at 1.51g/t gold from 1.8m, including 2m at 7.65g/t gold.
PDI reported that hole KKODD004 included 23m at 3.7g/t gold from 177m to the end-of-hole, confirming that high-grade mineralisation extends well below the oxide zone and deep into fresh rock.
The company said that the mineralisation was extended to a vertical depth of over 150m (200m downhole) with individual grades of up to 34.02g/t gold recorded over 1m (KKODD004: 194m – 195m).
Updates and further work
PDI said that with the results of this drilling program along with the previously announced initial RC drill results, it has become clearer that the overall gold mineralised envelope probably dips mostly to the west and therefore that a west to east drilling orientation (90-degree azimuth) is preferable.
Predictive announced that the samples from a further 31 RC holes (totalling 2,635m) and 1,168 power auger drill samples are currently in the laboratory awaiting assay.
The company said that RC and DD drilling are ongoing at NE Bankan with drilling testing depth extensions of the northern portion of the NE Bankan discovery within both the Kaninko and Saman Permits.
Predictive Discovery’s Managing Director Paul Roberts said: “With gold mineralisation at NE Bankan growing with receipt of each new batch of assays, the consistency and thickness of mineralisation both in the near surface and at depth is highly encouraging.
Significantly, the first DD results have confirmed that gold mineralisation at NE Bankan extends well below the oxide zone and deep into fresh rock with KKODD004 returning 23m at 3.7g/t gold from 177m, with the hole ending in mineralisation at a vertical depth of over 150m.
While this discovery is still at an early stage, having only announced first drill results in April, we have made great progress in a short period of time in better understanding the controls on mineralisation at NE Bankan.
With no outcrop at surface to guide drilling orientation, we completed power auger drilling to define the surface extent of the mineralised zone, reverse circulation drilling to test the oxide mineralisation and now diamond drilling to test the mineralisation in fresh rock at depth.
Drill holes to date have largely been orientated from east to west (270-degree azimuth), however these results and the recently released initial RC results1 suggest that the overall mineralised envelope may dip steeply to the west.
While the AC and RC drilling may not have been optimally orientated to test that dip, it has successfully defined the width of the gold-mineralised system which varies from 100m to over 200m in width in the known central portion of the NE Bankan zone.
Diamond Drilling is now testing from west to east (90-degree azimuth) and RC drilling on the northern extension on the Saman Permit will be orientated in the same way. In so doing we believe that we will achieve a better understanding of down-dip mineralisation continuity.”