Great Northern Minerals defines new IP targets at Iron Butte gold-silver project

• Comprehensive 3D review has identified four compelling new DDIP targets
• New strong undrilled chargeability anomaly found directly beneath Iron Butte
• Undrilled chargeability anomaly coincident with previously recognised geochemical anomaly
• IP chargeability anomalies potentially indicative of highly disseminated sulphide

Great Northern Minerals (ASX:GNM) has completed reprocessing of historical DDIP data and has defined four new exploration targets at the Iron Butte gold–silver project in Nevada, USA.

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The DDIP survey was undertaken by Angold in 2022, which completed six lines of natural field Magneto-telluric (MT) and 10 lines of pole dipole IP (PDIP)/resistivity at Iron Butte.

Zonge International subsequently ran the MT and Rock Bottom Geophysics (RBG) ran the IP/resistivity survey.

The two data sets are complementary and MT can map silicification represented as resistivity anomalies while the PDIP dataset can map disseminated sulphides which are often associated with alteration in epithermal and/or carlin-style gold systems as represented by chargeability anomalies.

The detailed reprocessing and review program has been recently completed by Perth-based consultants Resource Potentials. The key finding from this work have highlighted four new significant anomalies which have been identified as significant potential exploration targets.

A DDIP section in the central Iron Butte area that crosses the core mineralisation zone of the existing Iron Butte resource indicates a strong undrilled chargeability anomaly up to 30Mv/V that occurs beneath the Iron Butte inferred silver resource where several intersections end in gold-silver mineralisation.

A previous, deeper drill hole drilled the edge of the IP anomaly and intersected several intersections of gold and silver including 1.5m at 13.5 grams per tonne (g/t) gold, 11.5 g/t silver from 405.4m within 13.7m at 1.5 g/t gold, 3.0 g/t silver from 397.8m – however the core of the chargeability anomaly remains untested.

At the Caetano area, located one km northeast of the Iron Butte existing inferred resource, was previously recognised as a strong gold- and silver-in-soil anomaly within the newly staked claims.

The newly processed DDIP data indicates another strong undrilled DDIP anomaly located approximately 200m west of a previous drillhole that interested highly elevated gold and silver including 10.7m at 0.2 g/t gold and 11 g/t silver from 9.1m

“The new exploration targets identified through our detailed review of the existing DDIP data have the potential to significantly expand the existing JORC resource at Iron Butte,” non-executive chairman, Eddie King, said.

“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. We look forward to finalising our drill targeting, progressing permitting applications, and contractor engagement for our maiden drilling campaign at Iron Butte.”

GNM was steady at 3.3¢   with a Mkt cap of $16.22M.

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