Havilah Resources (ASX:HAV) has announced the start of its reverse circulation (RC) drilling at the Brooks Dam prospect, approximately 12km northwest of its Kalkaroo copper-gold deposit in South Australia.
The company says the program is targeting the Kalkaroo stratabound mineralised horizon, known as the K2 unit, where Havilah has identified coincident copper, gold, lead, and zinc soil and lag geochemical anomalies.
Drilling is funded under Havilah’s strategic alliance agreement with Sandfire Resources (ASX:SFR), announced in November 2025.
The campaign began after more than two months of delays caused by heavy and persistent rainfall across the Curnamona Province, according to Havilah, which prevented heavy drilling equipment from accessing the prospect.
Havilah interprets the geochemical anomalies as flanking a faulted regional anticlinal closure. Brooks Dam contains one of only two known regional outcrops of the K2 unit.
Historical rock-chip samples from a gossan-chert outcrop returned anomalous gold and copper assays, although the company did not report specific grades in its latest announcement.
Aircore drilling completed by Newcrest Mining in 1997 failed to penetrate the hard gossan-chert horizon but returned elevated bottom-of-hole copper values.
Havilah plans to drill through the horizon at several locations to test for underlying primary sulphide mineralisation and determine its thickness and extent.
Technical Director Chris Giles says Brooks Dam has not previously been tested with an RC rig capable of penetrating the horizon.
“Until we drill through it, we are uncertain of the thickness, grade, or extent of the expected underlying primary sulphide mineralisation, nor what it transitions to at depth,” Giles says.
Meanwhile, Sandfire has begun RC pre-collar drilling at Kalkaroo as part of a large-scale infill and extension program. It has also completed an 80-bed onsite camp and is installing a core-processing facility.
Sandfire expects another six rigs to arrive over the coming months as work advances on a planned US$70 million ($99.9 million) Prefeasibility Study, scheduled for completion in H2 FY2028.
Havilah has also completed heritage surveys covering planned drill holes at the Homestead, North Dome Breccia, and North Dome Closure prospects.
Write to France Pinzon at Mining.com.au
Images: Havilah Resources
