Krakatoa Resources Ltd (ASX:KTA) has some positive visuals from its reverse circulation (RC) drilling program targeting strong electromagnetic (EM) conductors at the wholly-owned Mt Clere Project in WA.
With a fourth hole recently completed, and drilling ongoing, all holes have encountered “significant widths” of sulphides.
First four holes complete
The first three holes were drilled over the Milly Milly EM target anomalies and the fourth hole has just finished at the North Bullbadger area.
Milly Milly holes revealed significant intervals containing sulphide minerals hosted within both highly metamorphosed amphibolite and BIF, and also disseminated within the surrounding granitic material.
Sulphide minerals identified include chalcopyrite (copper sulphide), pyrrhotite (iron sulphide) and pyrite (iron sulphide).
The project lies within the Narryer Gneiss Terrane at the northern edge of the Yilgarn Craton and predominantly contains highly metamorphosed and deformed granites and felsic gneisses along with mafic intrusive bodies and rafts of remnant sedimentary units.
Sulphides intersected
Drill hole MMRC01 intersected a sulphide mineralisation zone from 183 metres downhole. The mineralised zone was more than 60 metres thick, with the top 30-metre section reported to contain up to 30% sulphides, while the lower section had 2%.
These intervals were dominated by iron sulphides such as pyrite and pyrrhotite, with minor chalcopyrite. The distribution of sulphides through the Milly Milly holes are within both the BIF and granite.
The company believes this indicates the presence of a significant mineral system that has brought in the sulphides and reduced magnetite in the BIF to pyrite.
Pyrite is the sulphide mineral in overall highest abundance, though small concentrations of pyrrhotite were also widely noted. Discrete intervals of chalcopyrite were observed from initial logging, generally within zones of strong foliation.
Visual results
This information is based solely on visual inspection of the RC drilling rock chips – samples have not yet been assayed and analysed.
The company has not confirmed whether nickel, copper or platinum group element (PGE) mineralisation is present, although chalcopyrite has been sighted in the RC chips.
Krakatoa CEO Mark Major said: “It is exciting to see high concentrations of sulphides within the target system explaining the modelled EM conductors.
“It is still very early days in the exploration over these electromagnetic anomalies, however, it is important to keep the market apprised of our progress.
“The geology of the first holes drilled into the Milly Milly target is still being interpreted as it is imperative that we understand the complex geology as well as the processes for mineralisation.
“The presence of sulphides is an exciting initial observation and now we wait with anticipation for the assay results. The program is expected to continue for another week over other target electromagnetic anomalies.”
Next up
The company is completing detailed logging and sample preparation for submission to the laboratories this month.
RC drilling will continue to drill several other EM anomalies within the southern cluster before Krakatoa demobilises from the site.
The company is collecting the drill samples for analysis and the first batch of samples is expected to arrive at the Perth laboratory by Christmas.
Once drilling wraps, the company will make a decision on whether to conduct downhole electromagnetic surveys on all holes completed with sufficient casing, to evaluate the potential for off-hole conductors.
The company is also optimising the diamond holes to be drilled under a funding grant as part of the WA Government Exploration Incentive Scheme to help with further geological understanding in prospective areas.
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