Drilling at Cosmo’s flagship Mt Venn in WA has extended known copper sulphide mineralisation to the north, south and downdip of previous drilling.

All seven holes in the 1,550m reverse circulation drill program hit wide sulphide intervals with hole YARC021’s continuous zone of over 16m of massive and semi-massive sulphides being the standout. Assays are pending.

Downhole electromagnetic surveys were completed on six of the holes, taking the total number of DHEM surveys completed by Cosmo Metals (ASX:CMO) to 14.

“This latest round of RC drilling at Mt Venn is a great result for Cosmo’s technical team. To have intersected sulphides in all seven holes drilled is an outstanding result and continues to underpin our geological model at Mt Venn,” managing director James Merrillees said.

“In particular, the 16m interval of massive and semi-massive sulphides in hole YARC021 is a great result and we are looking forward to receiving assays from the lab for this hole and the rest of the program, which has extended known mineralisation to the north, south and down-dip.

Mt Venn drill program and DHEM

The drill program was aimed at supporting copper resource studies at Mt Venn and testing extensions of the shallow, thick copper mineralisation such as 46m at 0.8% copper from 141m intersected by drilling completed in late 2021.

While all seven holes intersected visual sulphide mineralisation, the company cautioned that laboratory assays will be required to determine the width and grade of the visual mineralisation reported in geological logs.

Meanwhile, DHEM surveying – an important exploration tool for conductive mineralisation such as magmatic copper-nickel sulphides – has been completed on six holes YARC017-022 as well as four holes on the Winchester project which were not surveyed back in 2020 due to COVID-19 travel restrictions at that time.

A hole drilled at Eastern Mafic on the ML3 target (YARC001) was also surveyed.

All DHEM data is currently with Cosmo’s geophysical team for modelling and interpretation with results from this work expected in the coming weeks.

The road ahead

A ground geophysical crew will now mobilise to Yamarna for a two-week moving loop electromagnetic (MLEM) survey to follow up on new targets generated from the company’s review of historical exploration at Mt Venn and Eastern Mafic.

This will also target the ML13 prospect where three holes drilled to test extensions of an electromagnetic conductor returned copper-nickel-PGE intercepts.

Once results are received from DHEM and MLEM work, Cosmo will move to carry out 2,000m of drilling in October to test the best targets.




This article was developed in collaboration with Cosmo Metals, a Stockhead advertiser at the time of publishing.


This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.