Warriedar Resources Limited (ASX: WA8) has identified seven confined bedrock conductors that are consistent with accumulations of massive sulphides with a second ground EM survey has been completed at the Golden Range and Fields Find Projects, in the Murchison province of Western Australia.
Together with the first survey, a total of 25 fixed-loop Electromagnetic (FLEM) receiver lines were surveyed, over 14 high-priority airborne EM anomalies. These surveys identified seven confined bedrock conductors that are consistent with accumulations of massive sulphides.
This second programme was carried out by GAP Geophysics under the direction of Newexco Exploration, leaders in EM survey planning and data modelling. Newexco modelled the data each evening during the survey, ensuring each target anomaly was fully “covered”. The company says preliminary modelling results are excellent and bode well for targeted successful drilling of the conductors.
Target refinement and work-up
The goal of EM surveying is to identify conductors below the ground, which may be caused by base metal bearing massive sulphides. Where gold is associated with massive sulphides, it can also be (indirectly) targeted. As per a typical geophysical workflow, Airborne EM is first used to identify where the conductors are (so called “anomaly hunting”), to be followed by Ground EM to better constrain the geometry of each discrete conductor for drill testing.
This workflow has been adopted by the company and has (to date) bestowed seven strong drill-ready targets, with modelled properties consistent with accumulations of massive sulphides.
Warriedar flew an airborne electromagnetic (AEM) survey (NRGA2304) over select blocks in the Golden Range and Fields Find Projects during February/March 2023. This complemented a 2014 AEM survey flown by Minjar Gold in June 2014 (AA140156).
A total of approximately 100 anomalies were identified from the 2023 NRGA2304 AEM survey data in addition to approximately 50 anomalies identified from the 2014 AA140156 AEM survey data. The anomalies were modelled and prioritised for follow-up.
Ground EM data is collected over AEM anomalies prior to drilling to allow the geometry of the subsurface conductor to be better understood and the pierce point for optimal testing to be better constrained. The short-term availability of a Vortex Geophysics FLEM crew in April 2023 and a GAP Geophysics FLEM crew in June 2023 enabled Warriedar to follow-up selected AEM and geological anomalies quickly and cost effectively.
