Initial Drilling Program
Superior’s initial drilling (August 2017), comprising a single deep (192m) vertical RC hole (SGDP001) targeting one of a series of high order IP chargeability anomalies, confirmed that Galah Dam is potentially a large-scale porphyry or massive sulphide copper-zinc-gold-silver mineralised system.
The drill hole encountered intensely altered and metamorphosed advanced argillic alteration mineral assemblages over the entire length of the hole from surface to 192m end-of-hole depth.
This result indicates that the very large folded alteration zone, which is visible at the surface, has dimensions of 4 kilometres of strike length, widths of between 100 metres to 500 metres and a depth extent in excess of 200 metres.
The drill hole assay results reported high sulphur values (wide zones of 2% to 5% pyrite (up to 20% semi-massive pyrite bands) associated with low gold, copper and zinc values.
Redistribution of metals
The low metal values observed in the drill hole are a result of the redistribution of metals caused by intense alteration together with observed deep acid leaching within the advanced argillic alteration zone. This redistribution or “stripping” of metals is typical of leached advanced argillic alteration systems, resulting in a concentration of metal content away from the acid leach zone.
Enhanced potential at Galah Dam
Superior’s exploration has enhanced the potential of Galah Dam by:
Given the size of the Galah Dam alteration zone and the lack of previous exploration drilling, there is significant potential to target the alteration interfaces for polymetallic ore zones along its several kilometres of strike length.