Twenty Seven Co Ltd’s (ASX:TSC) (FRA:U9V) review of historical soil geochemistry, combined with the reprocessing of open file historical geophysical surveys, has confirmed the presence of favourable structural settings at Yarbu Gold Project which warrant first-pass exploration investigation.
Historical data has been obtained through the Western Australian Department of Mines, Industry Regulation and Safety (DMIRS) WAMEX Mineral Exploration Reporting website and digitised as part of the company’s ongoing exploration of the project.
Historical gold in soil geochemistry as well as associated arsenic, and lead corresponds to gold mineralisation identified in historical drilling and suggests that Yarbu could contain multiple structural gold targets that have never been tested by modern geochemical techniques.
Favourable host lithologies
Compiling all of the historical soil data into a single database has given the TSC geological team an unparalleled insight into the geochemical signature of known mineralisation around the company’s Yarbu tenements.
Much of the surrounding tenure around the Yarbu tenements has undergone surface geochemical sampling by Beacon Minerals Ltd (ASX:BCN), Polaris Metals and Savage Australian Exploration with several large-scale regional soil grids completed over much of the Western Marda-Diemals Greenstone Belt.
Geochemical sampling has been completed at various grid spacings and is dominated by auger sampling, with selected areas using sieved soils.
The anomalies overlie known mineralised structures and favourable host lithologies and highlight complex structural settings within Yarbu.
These anomalies appear to be associated predominantly with fold hinges along and proximal to the Clampton fault, which is a major regional crustal-scale mantle tapping fault separating the Marda-Diemals Greenstone belt to the east and the large Yilgarn granites to the west.
Yarbu Gold Project showing current tenements and historical geochem sampling coloured by gold parts per billion.
Field reconnaissance auger program
A large first-pass regional auger geochemical sampling program is being planned for early May 2021, will be conducted over the company’s three exploration leases at Yarbu.
The program is designed to identify any precious metal, as well as arsenic or lead, anomalisms and represents the first systematic exploration undertaken over Yarbu.
The program is expected to comprise around 660 holes drilled on an 800 metres x 400 metres pattern with the average hole depth planned for around 1-3 metres (depending on penetration rates) to allow for collection of a bedrock sample to analyse for gold as well as a full multi-element suite.