Recommences Major Drilling Campaign With RC Programme
Lefroy Exploration Limited (ASX: LEX) has kicked off a reverse circulation (RC) drilling programme at the Burns Prospect as a precursor to a larger diamond drilling programme, within the Gold Project (LGP) located 50km south east of Kalgoorlie in Western Australia.
The Burns gold copper 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.
An initial 22-hole RC and diamond drill programme totalling 4026m evaluated depth and strike extensions to the Burns Au-Cu system and was completed in February 2021. That 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.
The holes were either RC or RC pre-collared diamond holes that evaluated a 240m strike section of the Burns magnetic anomaly. This included four RC pre-collared diamond holes (LEFR266, 268, 272 and 273) that targeted the depth and strike extensions to previous drill hole OBUDD001 which intersected two broad zones of gold and copper mineralisation within basalt and porphyry on the west side of the Burns anomaly. Results are pending for these four diamond tails.
The RC programme intersected a spectacular gold and copper interval in hole LEFR260 containing: 60m at 5.22g/t Au and 0.38% Cu from 112m down-hole to end of hole, including: 20m at 12.2g/t Au, 0.87% Cu and 1.7g/t Ag from 144m
Managing Director, Wade Johnson, 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, now termed the Eastern Porphyry is open to the north and south and its eastern extent is unknown. The mineralisation is open at depth.
A similar porphyry was intersected in the RC drill holes (LEFR 263, 264, 265 & 270) on the two northern drill sections but without the tenor of Au and Cu mineralisation.
Mr Johnson said that importantly the tenor of Cu was increasing at the end of holes LEFR261, 262 and 263 supporting the view that the system is further east on these sections.
Hole LEFR263 ended in porphyry and intersected 14m @ 0.57g/t Au & 0.09% Cu from 152m to 166m (To End of Hole). There was also an increasing level of magnetite alteration in the porphyry associated with this Au-Cu mineralisation toward the end of this hole. These geological characteristics and grades are comparable to those observed as an outer alteration zone in the initial intervals of the Eastern Porphyry intersected in LEFR260. The company interprets that the 14m interval in LEFR263 noted above is peripheral to a stronger mineralised zone at depth.
“We are very pleased and excited to be back drilling at Burns to follow up and extend the stunning gold copper intersection hosted by porphyry in hole LEFR260,” Mr Johnson said.
“The current RC programme is preparing holes to be used for a broad scoping diamond drilling program that aims to both extend and advance the geological understanding this exciting new porphyry hosted mineral system.
“We also keenly await results for the four diamond holes drilled earlier in the year evaluating the adjacent basalt hosted gold copper silver mineralised zone.”
A six-hole reverse circulation (RC) drill hole programne is underway at Burns. The RC holes are pre collars for diamond drill holes (tails) that are part of a larger program of diamond drilling that is due to commence in early April. The pre collars will range in depth from 60m to 150m, but dependent on geology, ground conditions and quality of sample recovery. Assay results from these 6 pre collars are expected in May.
Pre-collars for eight holes are already prepared. These are a combination of previous and new (LEX) RC drill holes and includes LEFR263 that will be extended. That diamond drill programme will be an initial 14-hole test to evaluate the Eastern Porphyry over a 200m strike length on 40m spaced drill sections. The first hole of that programme will be a diamond hole to twin and extend past the high-grade interval in LEFR260.
