Intersects Outstanding High-Grade Au and Cu Mineralisation
Lefroy Exploration Limited (ASX: LEX) has drilled spectacular gold and copper intersection in its combined reverse circulation (RC) and diamond drilling programme at the Burns Prospect, within the Eastern Lefroy tenement package, which is part of the wholly owned greater Lefroy Gold Project (LGP) located 60km south east of Kalgoorlie in Western Australia.
The intersection of 60m at 5.22g/t Au and 0.38% Cu from 112m down-hole to end of hole LEFR260, included 20m at 12.2g/t Au, 0.87% Cu and 1.7g/t Ag from 144m.
Chairman, Gordon Galt, said this new porphyry and the high-grade Au-Cu and Ag mineralisation on the eastern side of the Burns magnetic is an exciting new development. This porphyry is open to the north and south and its eastern extent is unknown. The mineralisation is open at depth,
“The intersection in LEFR260 is outstanding by any measure and is quite exciting. LEX will follow up as soon as possible,” Mr Galt said.
“We will need to look north, south, east and deeper from this discovery hole to establish the structure/s which have delivered this intersection.
“The next phase of drilling is being scheduled now and will include immediate diamond drilling to extend and support the mineralisation discovered in LEFR260.”
The Burns gold (Au) copper (Cu) prospect is situated on the eastern margin of a large interpreted felsic intrusion, termed the Burns Intrusion. The intrusion does not outcrop and is represented by a distinctive annular aeromagnetic and gravity geophysical signature.
The relationship between the larger Burns Intrusion and the Au-Cu mineralisation that is associated with porphyry intrusions at the Burns Prospect is unclear. The tenement (E15/1715) covering the greater Burns system was granted to LEX on August 31, 2020.
An initial 22-hole combined RC and diamond drill programme totalling 4026m, designed to evaluate the depth and strike extensions to the Burns Au-Cu system was completed on February 12, 2021. The programme evaluated the previously defined Burns Prospect at depth on four, 40m spaced sections, with two 40m spaced step-out sections testing the northern strike extent. Two RC holes evaluated the underexplored eastern side of the Burns anomaly.
A similar but separate porphyry was intersected in the RC drill holes on the two northern drill sections but without the tenor of Au and Cu mineralisation. Importantly the tenor of Cu was increasing at the end of holes.
The intersection in LEFR260 supports the growing evidence that Burns is a much larger alteration and mineral system that is related to the porphyry intrusions. This is supported by the recent reporting of the native copper hosted by basalt up to 190m down hole in multiple drill holes on the western side of the Burns magnetic anomaly.
Planning and scheduling for follow up diamond drilling to validate and extend the mineralisation in LEFR260 is underway.
