The Devils Creek-Siphon area located in the north end of the Dunstan Mountains, south of the Bendigo goldfield, Central Otago. The basement geology comprises textural zone TZ4, upper greenschist facies, psammitic and pelitic schists which are interlayered with folded metachert and metabasite horizons that act as good marker units to constrain late- and post-metamorphic deformation. The area is cut by the Green Valley Fault (GVF) which is an inferred regional-scale, shallowly NE-dipping, normal fault (Turnbull, I.M. 2000, MacKenzie and Craw, 2005). The fault and adjacent schist are highly prospective for gold mineralisation as it is subparallel to, and likely to be coeval with the Late Cretaceous, Thompson Gorge Fault (TGF) which truncates TZ4 schist that hosts the Rise and Shear Zones inferred resource of 2.4 million oz Au, located 6.2 km, to the north (Cox et al., 2006, Santana Minerals, 2024) A detailed geological mapping program has been undertaken to assess the location of the GVF and asses the areas prospectivity for hydrothermal gold mineralization.