2D shallow seismic reflection (SSR) survey identifies shallow reflectors in basinal structure at
Preliminary report and interpretations of the processed data have been presented to the Company. The SSR was planned to gain information about the effectiveness of the SSR method at the project and, if successful, recover data that enables better characterization of the brine targets identified in Audio Magneto-telluric ('AMT') data (refer to ASX release 15/11/2021). The survey also tests the use of the 'PinPoint' source: a cost effective, environmentally friendly method. The Company has not yet received a final report on the work completed nor its results, however preliminary observations and interpretations include the following: The survey appears to have successfully imaged some reflectors located in the top 500 metres.
Coherent and continuous reflectors are observed in the middle portion of the survey line.
Seismic character degrades significantly in the eastern part of the traverse with reflectors appearing less coherent and discontinuous.
Reflectors pull up towards the eastern and western ends of the line suggesting sedimentary layers sag downwards in the central portion of the project area which would be consistent with our interpreted basin structure from gravity data.
The survey work was commenced on 24 November and completed on Sunday
The PinPoint source method has low impact on the environment and is cost efficient. The PinPoint source delivers a relatively small amount of energy into the ground. For better penetration and to less ambiguously characterise deeper geology it is thought a more powerful source than PinPoint, such as a vibroseis vehicle is likely to be required. However, for acquiring data that aids modelling brine targets at depths to about 500 metres in the Alkali Lake North project environment the PinPoint source and SSR method has demonstrated its usefulness.
RLC Managing Director
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