Western Australia focussed Peak Minerals Limited (ASX: PUA) has confirmed the presence of pentlandite-chalcopyrite nickel-copper sulphide mineralisation at the Lady Alma Prospect with the Green Rocks Project with an intrusion related to massive sulphide veins.
The company has now received the results from diamond drilling at the Lady Alma Prospect completed in 2021. The drill results, combined with the recently released rock chip samples map a small mafic-ultramafic intrusion, approximately 650m x 300m (~0.2km).
The intrusion is one of a cluster of mineralised intrusions including (in order of size) Copper Hills, Lady Alma, Rixon and Rinaldi. The Lady Alma intrusion consists of disseminated mineralisation and zones of brecciated mineralisation along the contact to the pyroxenite.
Massive sulphide stringers up to 11cm in width are present and are classified as injections of chalcopyrite, pyrrhotite and pentlandite from a proximal magmatic source.
The prospective intrusion remains untested at depth, with historical drilling focused on near surface sulphide veins and associated Cu-Au mineralisation that was previously mined.
“For a hole that did not effectively test the modelled conductors, these intersections are significant. This system is of fertile, magmatic origin, and appears to have scale,” CEO, Jennifer Neild, said.
“When Peak first looked at this project, the target was Cu-Au and thought to be a VMS system. This work confirms a magmatic target and one with the potential to host considerable nickel sulphide mineralisation.
“All the work completed over the last year has further enhanced the area with thorough geochemistry and mapping. This, combined with high resolution ground geophysics, is going to give us the best chance at unlocking this system.
“We are more and more confident that the source is very close. We look forward to completing ground based moving loop EM across these high priority conductors prior to drill testing in Q2 CY22.”
Drilling
The hole was planned directly post-acquisition of the Copper Hills tenement to demonstrate the potential of the already identified Lady Alma and Copper Hills prospects and to test the stratigraphy. CHRCD004 was a diamond tail drilled off a pre-collar completed in November 2020. A second hole, CHD005A, was drilled to the north of CHRCD004 and collared from surface due to the trajectory of CHRC005 being inadequate/
This hole collapsed, and CHD005B was re-drilled from surface to 525.6m. CHD005B was steepening and the trajectory indicated it would not hit the target.
This hole was terminated and wedged (CHD005BW1) and it intersected the intrusion, albeit at a very steep angle down the contact, and was continued to try and drill through the whole stratigraphy of the intrusion. At the time only historical geophysical data and modelling was available.
For further information please visit: https://www.peakminerals.com.au/
