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Twenty Seven Co's AEM survey identifies 13 conductors at Rover Project in WA

Reverse circulation drilling will test airborne electro-magnetic (AEM) targets, which are undergoing follow-up mapping and sampling.

Twenty Seven Co Ltd - Twenty Seven Co identifies 13 conductors in AEM survey at Rover Project in WA
AEM surveys are particularly useful in the detection of VMS and nickel sulphide mineralisation

Twenty Seven Co Ltd (ASX:TSC) has identified 13 conductors along a 20 kilometre-long prospective gold strike within part of the Maynard Hills greenstone belt at the Rover Project in Western Australia.  

The conductors were identified in a recently completed airborne electromagnetic (AEM) survey, emphasising and enhancing the prospectivity of the project.

TSC’s geology team is now in the field preparing to begin follow-up RC drilling to expand the shallow high-grade gold discovery and VMS potential at the Creasy-1 and Harmonic prospects.

Chief executive officer Ian Warland said: “Without question, identifying 13 conductors along the Maynard Hills greenstone belt from the AEM survey exceeded expectations.

“This is an exciting development for TSC and delivers a significant pipeline of highly prospective gold & VMS targets.

“As the geology team is at-site for the start of the upcoming RC drilling campaign, we have taken the opportunity to reconcile the AEM results with field observations to formulate which targets are to be prioritised for drill testing."

The conductors have been grouped into five areas sequentially from north to south, including:

  • Two conductors at Creasy-2 VMS prospect;
  • Five conductors covering a 600-metre strike at newly discovered Red Bush prospect;
  • One conductor around 300 metres west of Creasy-1 gold prospect;
  • Three conductors at the southern end of Creasy-3 prospect; and
  • Two conductors coincident with a gold target identified in a geophysics study last year.

Red Bush conductors

Overall, the results are highly encouraging, with the best conductive response at Red Bush, where responses on five adjacent lines define a conductor with a strike extent of 600 metres.

Notably, modelling the Red Bush conductor from the centre shows it commences from a depth of 60 metres, extending to 160 metres, and dips WSW parallel with bedding in the area.

Conductors identified

Two conductors were identified at Creasy 2, with one around 220 metres southeast along strike from drill hole 19RVRC016, which intersected a thick zone of anomalous zinc from surface including 24 metres at 1,825ppm zinc, grades up to 3,020ppm zinc in a 3-metre composite sample and 6 metres at 2,210ppm from 33 metres.  

At Creasy 3 three conductors were identified at the southern end of Creasy 3, which is a copper-gold in-soil anomaly. The nearest rock-chip (RVR063), around 270m north of the conductors, returned anomalous gold at 108ppb Au in BIF.

A conductor was also found in an area under shallow sand cover around 300 metres west of Creasy-1, where the shallow gold discovery was made.

As the conductor coincides with a magnetic high, interpreted as a BIF, it will be drilled in the upcoming 2020 RC drilling campaign.

The second conductor is under shallow sand cover and coincident with a linear magnetic anomaly interpreted as mafic rock or BIF.

Ongoing and next steps

RC drilling at Creasy-1 and Harmonic VMS is set to commence imminently;

AEM targets, which are undergoing follow-up mapping and sampling, will be assessed for ground electromagnetic survey prior to drill testing.

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