Twenty Seven Co Ltd (ASX:TSC) has started follow-up exploration at its Rover Project in WA, focusing on Red Bush and Mistletoe prospects as well as the Maynard Intrusion target along the 20-kilometre-long prospective gold strike.
Auger drilling and soil sampling is underway, including at the newly discovered Mistletoe prospect where a single reverse circulation (RC) hole test in May of a bedrock conductor intersected 3 metres at 1.75 g/t from 113 metres.
Chief executive officer Ian Warland said: “The next phase of fieldwork is underway focusing on better defining the gold potential of the new Mistletoe and Red Bush prospects at Rover in WA.
“We have begun an extensive soil and auger program in areas that are untested by previous explorers along the highly prospective Maynard Hills greenstone belt.
“This work will help prioritise the upcoming RC program at Rover, which will include follow-up drilling of the shallow gold discoveries at Creasy 1 and Harmonic prospects.”
Eight bedrock conductors identified in April 2020 at Rover were RC drill tested, with the discovery of new zones of gold mineralisation at the Red Bush and Mistletoe prospects.
The Mistletoe gold prospect, which was discovered in May in mafic schist, is under shallow cover with no outcrop or past surface geochemistry coverage.
It is around 14 kilometres and 6 kilometres southeast of the Creasy 1 and Red Bush prospects respectively, which the company believes confirms the Maynard Hills greenstone belt’s strong gold prospectivity.
A targeted auger drilling campaign has commenced on 100-metre spaced east-west orientated lines covering the 450-metre-long bedrock conductor.
This will define near-surface gold anomalism prior to follow-up RC drill-testing.
Red Bush prospect
The May 2020 drill program also discovered a new zone of gold mineralisation at Red Bush including:
- 3 metres at 0.17 g/t from 62 metres, and;
- 12 metres at 0.15 g/t from 86 metres, including 3 metres at 0.22 g/t from 86 metres.
Red Bush has been tested by only one RC hole, drilled into the centre of a 600-metre-long bedrock conductor represented by five AEM anomalies on adjacent lines.
In 2019, 250 metres to the southeast of the drill hole and within the conductive area, the company collected a strongly anomalous rock-chip assaying 4,040 parts per million arsenic and 14 parts per billion gold.
This supports a possible strike extension along the 600 metres conductive zone.
The company is now completing soil and auger geochemical drilling to search beneath the thin cover and better define the Red Bush target ahead of further RC drilling.
Mistletoe is located around 14 kilometres south-east of Creasy 1 along the 20-kilometre prospective gold strike
Maynard Intrusion target
Auger drilling will also test the new conceptual Maynard Intrusion target identified during interpretation of detailed aeromagnetic data which indicated a 2.5-kilometre-long by 900 metres wide granitic intrusion interleaved with mafic and ultramafic rocks within the greenstone belt.
The shape of the intrusion is interpreted to be due to deformation and it may potentially contain gold trap sites in areas of high fluid flow at either end of the intrusion or in shear zones formed at the contact between the intrusion and the greenstone belt.
There are several examples of this style of mineralisation in the goldfields including the 2.7-million-ounce Granny Smith deposit in the Laverton Greenstone belt.
TSC has commenced soil sampling and auger drilling at Mistletoe, Red Bush and the Maynard intrusion.
The next RC drilling campaign will focus on extending known mineralisation around Creasy 1 and Harmonic prospects, where large gold systems have been discovered, with provision to also test targets that emerge from the current auger and soil geochemical surveys