Evidence of historical workings wasn’t previously anticipated and the identification of conglomerate mineralisation has provided confidence.
The recovery of small gold nuggets has been a key feature of early reconnaissance.
Castle is one of a number of companies exploring for Witwatersrand style conglomerate hosted gold in the Pilbara region.
Hence, the identification of small nuggets at this early stage is encouraging.
Outcropping Mt Roe basalt a welcome surprise
In the course of exploration Castle unexpectedly located 3 kilometres of intermittently outcropping and previously unrecognised Mt Roe basalt.
It was amongst this outcrop that the company recovered 62 small to spec size gold nuggets from four locations that strongly correlate with the conglomerate.
The largest nugget weighed 4.2 grams, and the total weight was 29.7 grams.
More focused exploration to follow initial reconnaissance
Having successfully completed reconnaissance mapping, the next stage of exploration will involve bulk stream sediment sampling.
Castle will be targeting creeks draining the 16 kilometre unconformable contact, conducting soil sampling across areas of residual cover where conglomerate is not exposed.
Rock-chip sampling and metal detecting will be undertaken with the latter being low-cost exploration that has worked for other companies targeting similar mineralisation.