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Fortitude North – Exploration
Fortitude North – Exploration Prospect
This prospect occurs along the Fortitude Fault only ~7km from the Fortitude Mine, which is interpreted to be on the same structure.
Figure 1 – Interpretive plan of the Fortitude North Prospect showing key intercepts
The Fortitude North discovery is the result of a follow up of anomalous gold intercepts in wide spaced legacy aircore drill holes.
To date three phases of follow-up aircore and RC drilling programmes have been completed at Fortitude North which have identified gold mineralisation in weathered mafic volcanic rocks over a distance of ~2km along the Fortitude Fault. The mineralised zone is located in an area of difficult access with the northern part in sand dunes, and it extends to the south under a small lake. There have been a number of significant gold mineralised intersections as summarised in the diagrams.
Mineralisation is overlain by up to 40m of transported lake sediments which can be seen to also contain anomalous gold values adjacent to the basement mineralisation which is thought to be the product of erosion of basement gold mineralisation.
Figure 2 – Oblique section subparallel with the interpreted basement mineralised zone which remains open at depth
Gold intersections include very high values of up to 84.1 g/t Au, within broad mineralised intervals with good examples as follows:
Diamond intercepts include:
8m @ 2.94 g/t Au
Incl. 5.75m @ 3.8 g/t Au
Incl. 1.3m @ 6.73 g/t Au
Down-dip extension of previous high grade gold intercepts include:
5m @ 5.46 g/t Au
8m @ 5.14 g/t Au
Aircore intercepts include:
47m @ 2.55 g/t Au from 42m (18FNAC071)
incl. 8m @ 2.22 g/t Au from 42m
and 5m @ 17.7 g/t Au from 53m
incl. 1m @ 84.1 g/t Au from 53m
and 2m @ 1.10 g/t Au from 79m
The highest grades e.g. 1m @ 84.1 g/t Au in drill hole 18FNAC71 are interpreted to reflect supergene enrichment of primary mineralisation in the weathering profile.
Four of the five RC drill holes completed in July 2018, intersected gold mineralisation in variably weathered to fresh mafic volcanics and provide some insight into the nature of mineralisation at depth. Key RC results include another very broad interval of 50m @ 1.1 g/t Au from 79m which includes gold values between the detection limit of 0.01 g/t Au to a maximum value of 11.75 g/t Au and was interpreted as a variably gold mineralised and moderately east dipping zone ~ 40m thick.