A maiden survey conducted by Legend Mining Ltd (ASX:LEG) has yielded promising results at the company’s Magnus prospect, part of the Rockford Project in Western Australia’s Fraser Range.
The company is pursuing the potential for significant nickel-copper sulphide discoveries in the Fraser Range using the latest technology.
The High-Power Fixed Loop Electro-Magnetic (HPFLTEM) survey picked out four zones containing multiple conductors, including a significant high-conductance zone of up to 5,000 siemens on the margin of a gravity anomaly outside and below existing drilling.
“It is particularly pleasing from an R&D perspective, that these results demonstrate that the Legend team has been able to design a surface EM system which can identify conductive zones below 600 metres, which challenges conventional thinking,” Legend Mining executive chair Mark Wilson said.
Key findings
The HPFLTEM survey at Magnus revealed 12 conductors across four zones, with Zone 3 emerging as a key area of interest.
Zone 3 consists of four large conductors with conductance values up to 5,000 siemens, 550 metres below surface on the margin of a gravity feature interpreted as a deep intrusion.
These conductors cross-cut aeromagnetic stratigraphy, indicating they are likely not of a stratigraphic nature and are situated outside the levels of aircore drilling conducted to date.
Zones 1, 2, and 4 also contain conductors of varying sizes and conductance, with Zones 3 and 4 considered high-priority drill targets for further investigation.
“These are some of the better results from EM surveying conducted by Legend at the Rockford Project,” Wilson said.
“The size, strength and interpreted geological setting of Zone 3 in particular, makes this zone a promising drill target.
“We are looking forward to diamond drill testing these targets once we have negotiated a land access agreement with the Upurli Upirli Nguratja Aboriginal Corporation whose claim was determined on 28 November 2023.”
Area Y survey underway
Meanwhile, at Area Y, 10 kilometres southwest of the Mawson prospect, Legend is conducting a Moving Loop Electro-Magnetic (MLTEM) survey.
Previous aircore drilling identified prospective intrusions, including ultramafic and mafic rocks similar to those hosting nickel-copper-cobalt mineralisation at Mawson.
The MLTEM survey aims to detect conductive features that could indicate nickel-copper sulphide targets. Initial results from this survey are expected by mid-November 2024.
Future programs
Legend plans to incorporate advanced technologies such as artificial intelligence and machine learning (AI/ML), alongside drilling, gravity modelling, aeromagnetic data and HPFLTEM datasets, to refine its drill targets at Magnus.
Additionally, heritage clearance is being sought to proceed with drilling at Magnus, while further MLTEM survey results from Area Y will guide additional exploration efforts.