Special Report: Lefroy’s maiden drill program at the Burns prospect near Kalgoorlie has intersected native copper in multiple drill holes over a 140m strike length that remains open.

Native copper is a naturally occurring metal that is present as either fine disseminations or up to 1cm pieces at Burns and is likely to represent a secondary enrichment from a deeper sulphide source.

Evidence of said deeper sulphide source comes from the intersection of copper sulphides in one of the holes drilled to date.

This is an important development for Lefroy Exploration (ASX:LEX) as native copper had not been noted in historical reverse circulation or diamond drilling.

All five holes where native copper was intersected are step-out holes aimed at evaluating the Burns system at depth and define a northerly trending corridor of native copper hosted by fresh basalt that is open to the south

To date, 22 holes totaling 3,810m have been completed out of the planned 25 holes that are intended to evaluate the depth and strike extensions to the Burns gold copper system.

Diamond drilling is ongoing and is expected to be completed in mid-February. Final assay results are expected in March.

lefroy exploration burns copper native examples
Images of native copper at the Burns prospect. Pic: Supplied

Drilling details

The holes drilled to date are either RC or RC pre-collar diamond holes that have evaluated a 240m strike section of the Burns prospect within Lefroy’s namesake project.

Native copper was intersected within fresh basalt at the five holes drilled at 40m spaced sections with one hole returning two zones of native copper, the deepest being at 190m down-hole.

Lefroy also drilled a single traverse of three RC holes to evaluate the Smithers magnetic anomaly about 300m north of Burns.

Smithers has a similar character to the anomaly found at Burns but has a weaker magnetic feature due to up to 50m of palaeochannel (transported) cover.

While it has not been evaluated yet, it could represent another magnetite altered basalt-porphyry system like that at Burns.



This article was developed in collaboration with Lefroy Exploration, 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.