This report describes the work undertaken by Marmota Limited as a successful applicant for funding through round one of the South Australian Accelerated Discovery Initiative (ADI). Marmota has undertaken biogeochemical surveys at its Aurora Tank gold deposit since early 2018. Marmota’s initial work has demonstrated that gold mineralisation at Aurora Tank can be expressed in biogeochemical samples taken from Acacia and Senna plants (which are widespread in the NW Gawler Craton), and it has been successful in identifying additional mineralisation zones. The project seeks to explore the scope and potential for biogeochemical exploration as a regional exploration tool and potentially provide insight into issues such as: • Is regional biogeochemical sampling a viable tool to identify new gold mineralisation in the NW Gawler Craton? • Can biogeochemical sampling identify buried mineralisation with no coincident calcrete anomalism? • Is there an optimal gold and multi-element signature that is more indicative of gold mineralisation in biogeochemical samples? The work undertaken also hoped to address a number of knowledge gaps relating to biogeochemical sampling including: the selection of the species to be sampled, the organ of the plant to be sampled, element seasonal variability, depth potential for plants to express buried mineralisation, and the optimal elemental signature of mineralisation with the plant sample assays. As part of the project more traditional calcrete samples was undertaken simultaneously with biogeochemical sampling at each location. The aim was to allow for comparison of the assays produced by each method and to better understand the limitations and potential for each method. It was proposed that drill targets would be generated and tested from the surface geochemistry and biogeochemistry anomalies to evaluate the effectiveness of the sampling as a regional exploration tool. As part of this project, Marmota carried out an extensive biogeochemical sampling program with over 2,984 samples collected. However, due to the identification of QA/QC problems within the lab which have not been sufficiently resolved, the assay results from much of the work on Woorong Downs and Comet was not considered reliable and was not the primary driver for drill target generation [as such only 446 samples have been submitted]. A total of 2741 calcrete samples were collected on a 400 x 400 m sampling with in-fill sampling at 100 x 100 m scale. A total of 33 RC holes were drilled for a total of 2681 m across EL 6470 (Aurora Tank), EL 6083 (Woorong Downs) and EL 6084 (Comet). Due to QA/QC issues with the biogeochemistry assays from samples over much of the project area, only samples collected within Commonwealth Hill and Ambrosia tenements were considered for further sampling or drill testing. The absence of any biogeochemical Au anomalism within Commonwealth Hill resulted in no drill targets, and 4 discrete Au anomalies within Ambrosia were considered not significant for immediate drill testing. In order to provide a comparison of biogeochemical and calcrete assays, areas with biogeochemical and calcrete Au anomalism from previous Marmota sampling programs were drill tested. The results of the drilling seem to indicate areas with coincident or adjacent trends of elevated to anomalous Au assay in both sample media, provided the best indicator of underlying Au mineralisation. Drill testing of Au pathfinder elements anomalies within Comet and Woorong Downs produced no significant intercepts, across a range of regolith-landform conditions. The one significant Au result, 1 m @ 7.7 g/t Au from 47 m (22ADIRC17), came from an area with no significant Au or pathfinder anomalism. This highlights the historically mixed success rate for the drill testing calcrete anomalies, the potential for significant mineralisation to have no expression in calcrete geochemistry, and the need to find other geochemical exploration tools for targeting mineralisation undercover in the Gawler Craton. Drill testing of Ce anomalies to test the potential of identifying REE mineralisation, resulted in the identification of 4 holes with intercepts greater than 500 ppm TREO. The correlation of these intercepts in 3 holes over elevated to anomalous Ce in calcrete assays suggest that calcrete may play a role in targeting clay hosted REE mineralisation in cover or weathered basement in the NW Gawler Craton. The results of this project highlight the potential for biogeochemical sampling for Regional Exploration, brownfields exploration adjacent to the Aurora Tank Gold deposit was able to identify new gold intercepts. The regional application of this was not able to be fully investigated due to unresolved QA/QC issues. The number of statistically significant and robust geochemical and biogeochemical anomalies identified under this program was not large enough to be able to reliably draw broader statistical conclusions from. Marmota was not able to identify an optimal gold and pathfinder element signature in the biogeochemical or calcrete samples to best target gold mineralisation.