Arrow Minerals Ltd. has uncovered seven historical diamond drill holes from its Yarraloola copper project at the Geological Survey of Western Australia (GSWA) core library, providing crucial geological insights ahead of an upcoming drilling campaign in the Pilbara.
The 50-year-old drill core, originally drilled by previous operators including Western Mining Corp., includes mineralised intercepts such as 32.7 metres at 0.7 per cent copper, 0.3 per ccent lead, 16.3 grams per tonne (g/t) silver, and 0.4 per cent zinc from 54 metres in hole YD2.
Inspection of the core supports historical hypotheses that Yarraloola represents a volcanogenic massive sulphide (VMS) system. The find follows Arrow acquiring an 80 per cent stake in the project in June.
“It’s remarkable to discover that GSWA have core retained from seven 50 year old Yarraloola drillholes,” said Arrow Managing Director David Flanagan.
“The knowledge acquired from the historical drill core makes a big difference, and we are grateful for the diligence shown by GSWA in preserving the core.
“It doesn’t just help us correlate geology to the various geophysical anomalies and assays; it improves our ability to identify important and subtle alteration signatures in the upcoming 2026 drill program.”
GSWA has completed HyLogger scanning and photography on the core, while Arrow plans to fund non-destructive testing, including micro-analysis, to evaluate trace elements like gold within the base metal mineralisation.
Recent surface sampling near historical drill targets returned gold values up to 0.95g/t, prompting Arrow to include full-suite metal analysis, including gold, in future testing.
Preparations for a modern reverse circulation (RC) drilling program across key geophysical targets, dubbed Ava, Fraser, and Mr Thomas, are well advanced. Drilling will commence following the completion of follow-up ground geophysical surveys and core analysis later this year.
The company intends to use supplementary detailed ground geophysics to generate additional drill targets within the northern, Mr Thomas, and southern zones, which are also considered prospective for copper and gold.
