Drilling at Lefroy’s Burns prospect has enhanced and extended the copper-gold mineralised system to the north and south for a total strike length of 500m.

Diamond drilling on the zero-north section baseline intersected multiple broad zones of gold-copper and gold mineralisation that correspond to strong zones of visually identified mineralisation.

Notable results included 12.7m grading 2.53 grams per tonne (g/t) gold and 0.08% copper from 141.3m, and 6.6m at 1.14g/t gold and 1.18% copper from 102m in the same hole LEFD004.

Lefroy Exploration (ASX:LEX) noted that the five diamond holes, of which results for four have been received, had now established that at least 150m of vertical depth continuity of altered and mineralised porphyry and basalt is present below the 37m zone of gold-copper mineralisation in previously reported drill hole LEFR260.

LEFR260 hit 38m at 7.63g/t gold and 0.56% copper from 134m.

The results support the company’s initial interpretation of Burns as a multi-phase intrusion (diorite porphyry) related multi-stage mineralising system, with the final magnetite sulphide event mineralising both the porphyry and the basalt host rocks.

Additionally, the identification of a new gold-only system associated with pyrite mineralisation adds another target style and dimension to Burns.

lefroy exploration eastern porphyry burns
Drill hole plan at the Burns prospect highlighting the Jan-July 2021 drill program relative to LEFR260 and the interpreted extent of the Eastern Porphyry. Pic: Supplied

Step-out drilling

Lefroy added that step-out reverse circulation drilling had expanded the Burns mineral system by extending the eastern porphyry to the north, with hole LEFR290 intersecting a 101m downhole interval of altered porphyry including a 10m interval of intense magnetite-pyrite alteration.

This work also intersected a new thick, 30m downhole interval of massive magnetite containing up to 20% pyrite alteration in basalt in hole LEFR292.

Additionally, step-out drilling confirmed magnetite veined and altered host diorite porphyry at the Smithers magnetic anomaly, which is 250m along strike to the north of Burns and is now a priority target for the next phase of drilling.

Results remain pending for four diamond and nine RC holes.

Planning is also underway for the next phase of exploration with a detailed aeromagnetic survey scheduled for August.



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.