Legend Mining Ltd (ASX:LEG) has the initial results from a High-Power Fixed Loop Electro-Magnetics (HPFLTEM) survey conducted at the Octagonal prospect, part of the Rockford Project in WA’s Fraser Range, where it is seeking nickel and copper.
Three conductors found
Preliminary modelling of this survey, which covered the entire Octagonal Intrusive Complex (OIC), has revealed promising findings, including the identification of three conductors believed to be associated with nickel-copper mineralisation.
The survey, designed to detect conductors below 600 metres, was carried out from October to December 2023.
Despite atmospheric conditions causing unexpected delays, Highpower EM Geophysical Services Pty Ltd completed the maiden HPFLTEM survey at Octagonal.
The preliminary modelling indicates the presence of four conductors, with three suggesting extensions of nickel-copper sulphide mineralisation found in nearby drill holes.
Executive chair Mark Wilson said: “We are cautiously optimistic with the results of this survey to date.
“The evidence of nickel-copper mineralisation in drill holes proximal to the modelled conductors and the strong conductive source to the east of the Octagonal Intrusive Complex are both positive takeaways.
“As noted in this announcement the final modelling of these conductors will need the input of the data from the extended survey which is planned for March/April 2024.
Data highlights
Conductor 1 - Positioned down dip along the intrusion contact, close to mineralisation intersected in drill holes OCT0184 and OCT0190.
Conductor 2 - Intersected at the top edge by drill hole OCT0005, showing a zone of nickel-copper sulphide.
Conductor 3 - Southern extension of a zone with semi-massive nickel-copper sulphide intersected in OCDD003.
Conductor 4 - A deeper, low conductivity feature aligning with the seismic structure interpreted as the feeder system at the base of the OIC.
The survey also uncovered a strong conductive zone extending east of the OIC, remaining open for further exploration.
The data identified a strong conductive source extending to the east of the completed survey area, which is intriguing because it is the interpreted extension of the OIC.
This hypothesis is supported by two diamond drill holes that intersected nickel-copper sulphide within fertile ultramafic sills close to this conductive source.
This confirms that the mineralised intrusion occurs outside the main OIC body – a style of mineralisation that mirrors the region’s well-known Nova-Bollinger discovery.
To follow up on these encouraging results, Legend Mining plans to extend the HPFLTEM survey, with data acquisition for the extended survey anticipated around the first quarter of 2024.
This extension aims to explore the newly identified zone east of the OIC and generate diamond drill hole targets, potentially unveiling further mineralisation prospects at Octagonal.
Future plans
From here the company will design and plan for an extension to the HPFLTEM survey, with data acquisition scheduled for March/April 2024 to avoid atmospheric delays.
Based on the findings of this extended survey, Legend will generate targets for diamond drilling.
The outcomes of the HPFLTEM survey signify a promising step forward in uncovering the full potential of the Octagonal prospect, possibly opening new avenues for mineral exploration and development in the region.