Cosmo Metals Ltd (ASX:CMO) has received promising results from a downhole electromagnetic (DHEM) survey recently completed at the company’s Yamarna (Mt Venn and Eastern Mafic) and Winchester Projects in Western Australia.
Airborne and ground-based electromagnetic (EM) geophysics has been an effective tool to detect buried massive sulphide mineralisation in the Yamarna area, where all EM targets tested by drilling to date are explained by sulphide accumulations, rather than other conductive sources such as graphitic sediments and salt water.
Cosmo’s DHEM survey was planned to test for ‘off-hole’ conductors at Mt Venn noting that copper (Cu), nickel (Ni) and cobalt (Co) mineralisation at Yamarna is hosted by conductive sulphide minerals (e.g., pyrrhotite-chalcopyrite).
In addition to surveying the five holes (YARC017-YARC021) drilled at Mt Venn in August, the company took advantage of having the geophysical crew on site to also:
- Survey two holes drilled at the Minjina base metals target, ~900m north of Mt Venn
- Survey four holes (20WMRC001-004) drilled at the Winchester JV, ~50km NW of Mt Venn, by Great Boulder (ASX:GBR) in 2020.
The Cosmo team is very excited by results from the DHEM survey at Minjina, a completely ‘blind’ target associated with known base metals mineralisation,” Managing Director James Merrillees said.
“Minjina represents a compelling target given the association of a strong DHEM conductor with known base metals in previous drilling and widespread Cu in surface sampling. Minjina’s proximity to Mt Venn has the potential to be a game changer in our Yamarna strategy.
“With an RC rig lined up in November to test this target, a crew is out in the field again this week collecting moving loop EM to define further targets at Eastern Mafic and Mt Venn for testing post the Minjina drilling campaign. With results imminent from the August RC programme at Mt Venn I am looking forward to a busy period for Cosmo.”
