
Reprocessed DDIP data reveals four anomalies at the Nevada gold-silver project. The strongest sits beneath the existing resource, untested. Chairman Eddie King says the targets validate the scale-up potential.
Great Northern Minerals (ASX:GNM) has identified four new exploration targets at its Iron Butte gold and silver project in Nevada.
The reprocessing of historical dipole-dipole induced polarisation (DDIP) data, a standard tool in commodities analysis, defined the targets. The original survey was run by Angold in 2022. It covered six lines of natural field magneto-telluric (MT) data and 10 lines of pole-dipole IP and resistivity. Zonge International handled the MT component. Rock Bottom Geophysics ran the IP and resistivity survey. Perth-based consultants Resource Potentials completed the reprocessing.
The two data sets work together. MT maps silicification through resistivity anomalies. PDIP maps disseminated sulphides through chargeability anomalies. In epithermal and Carlin-style gold systems, those sulphides often track the alteration.
The strongest new target sits in the central Iron Butte area. A DDIP section crossing the core mineralisation zone shows a strong undrilled chargeability anomaly up to 30 millivolts per volt. It sits beneath the existing Iron Butte inferred silver resource. A previous deeper hole drilled the edge of the anomaly and hit 1.5 metres at 13.5 grams per tonne gold and 11.5 grams per tonne silver from 405.4 metres. That same hole returned 13.7 metres at 1.5 g/t gold and 3.0 g/t silver from 397.8 metres. The core of the anomaly remains untested.
A second target lies in the Caetano area, one kilometre northeast of the existing inferred resource. The area was already recognised as a strong gold and silver-in-soil anomaly within newly staked claims. The reprocessed DDIP data shows another strong undrilled anomaly roughly 200 metres west of a previous drillhole. That hole returned 10.7 metres at 0.2 g/t gold and 11 g/t silver from 9.1 metres.
Non-executive chairman Eddie King said the new targets have the potential to expand the existing JORC resource. "These targets validate our assumption that there is an opportunity to significantly increase the scale and upside potential of the Project given the potential for epithermal-carlin-style mineralisation," King said. The company is finalising drill targeting and progressing permitting applications for its maiden drilling campaign at Iron Butte.
GNM shares traded at 3.3 Australian cents. The market capitalisation is $16.22 million.
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