The Six Mile Hill 1:75 000 Map Sheet was produced as part of a mapping program integrated into the Mineral Systems Drilling Program (MSDP) along the southern margin of the Gawler Ranges. The objective of the mapping program was to provide a regional geological context in which the stratigraphy, alteration and mineralisation of rocks revealed by the MSDP drilling could be interpreted, and comprised detailed basement, structural and regolith mapping. This report comprises the Explanatory Notes to the Six Mile Hill Map Sheet, part of the Mineral Systems Drilling Program Special Map Series. Six Mile Hill spans a number of geological provinces, including the Mesoarchaean-Mesoproterozoic Gawler Craton, the Mesoproterozoic Cariewerloo Basin and the Neoproterozoic Stuart Shelf, as well as preserving a protracted history of deposition in the Cenozoic. The earliest history of the area is recorded by a phase of basin development in the late Palaeoproterozoic, comprising the deposition of the Broadview Schist, and emplacement of the Wire Dam Dolerite and Tip Top Granite, accompanied by solid-state deformation between c. 1790 and 1775 Ma. Further sedimentation occurred at c. 1755 Ma, comprising deposition of the Moonabie and Wandearah formations. This was followed by intrusion of the Moola Suite at c. 1745 Ma, and basin inversion during the Kimban Orogeny (c. 1740–1690 Ma), which comprised low temperature fabric development and the formation of mylonites and thrust faults during west-southwest-directed shortening. Open folding of the Moonabie Formation during northeast-directed shortening may have occurred during the Kimban Orogeny or early during the Kararan Orogeny (c. 1610–1590 Ma). This was followed by eruption of extrusive and pyroclastic felsic volcanics and subaerial and subaqueous basaltic lavas of the Gawler Range Volcanics during the early Mesoproterozoic (c. 1590 Ma). The Gawler Craton was overlain by fluvial red beds of the Pandurra Formation at c. 1420 Ma, and was subsequently subject to weathering and erosion until the Neoproterozoic. Deposition of sediments on the Stuart Shelf commenced at c. 825 Ma with fluvial sediments of the Backy Point Formation interlayered with subaerial basaltic lavas of the Beda Basalt, and intrusion of the Gairdner Dolerite in the Gawler Craton. The Stuart Shelf was subject to exposure and erosion until c. 645 Ma when there was marine transgression and deposition of the Tapley Hill Formation. This was followed by localised deposition of fluvio-deltaic to shallow marine facies of the Upalinna and Yerelina subgroups, including the Whyalla Sandstone, and then post-glacial transgression and deposition of the Tent Hill Formation after c. 635 Ma. Six Mile Hill was subject to weathering and erosion during the Palaeozoic and Mesozoic, after which it records deep weathering, silicification and ferruginisation, as well as the deposition of colluvial, alluvial and aeolian deposits during the Cenozoic, and neotectonic faulting.