Geological mapping of the Mingary 1:100 000 map area was completed in 2006 as part of the Broken Hill Exploration Initiative (BHEI). The mapping project began in 1995, and concentrated on the mapping of lithologies using a slightly modified version of the lithological scheme developed by the New South Wales Department of Mineral Resources (NSWDMR). The Mingary 1:100 000 map area lies adjacent to the New South Wales (NSW) border, and covers part of the Curnamona Province. It has significant, although scattered, outcropping Willyama Supergroup rocks. A number of detailed investigations were undertaken during this project in order to better understand the geology on the Mingary 1:100 000 map area and the correlations between the geology of the Olary Domain (OD) in South Australia (SA) and the Broken Hill Domain (BHD) in New South Wales (NSW). The boundary between these two southern domains of the Curnamona Province has been interpreted as crossing the Mingary 1:100 000 map area. The western and northern parts of the map area are dominated by OD lithologies, while BHD lithologies have been recognised in the eastern and southern parts of the map area. Geological mapping identified quartz-albite metasediments, granite gneisses, migmatites and composite gneisses, calc-silicate and calc-albitite rocks as the main lithologies comprising the Willyama Supergroup. This mapping revealed a distinctive orthogneiss (Mutooroo Gneiss) which displays significant differences to the felsic granites of the OD, while displaying many similarities with the granite gneisses of the BHD. At least five suites of mafic intrusive rocks were identified on the Mingary 1:100 000 map area, ranging in age from Palaeoproterozoic to post-Delamerian. Mesoproterozoic granites were also mapped in the north-western parts of the OD. In addition to geological mapping, investigations utilising geochronology, geochemistry and petrology have revealed the presence of BHD lithologies in the South Australian part of the BHD. Recent studies have identified a correlative of the Hores Gneiss, south-east of Mingary, which has a SHRIMP U-Pb zircon age of 1684±6 Ma that confirms the presence of upper Broken Hill Group in this part of SA. The recently defined Mutooroo Gneiss recorded SHRIMP U-Pb zircon ages of 1696±17 Ma, 1709±6 Ma and 1701±8 Ma. These ages correlate well with the granite gneisses of the Silver City Suite which crop out in the BHD of NSW. A detailed metamorphic study of Palaeoproterozoic metasediments in the southern Curnamona Province has included work on Mingary, and has revealed metamorphic isograds in the South Australian Willyama Inliers which link up with corresponding isograds in NSW. These results suggest that there is a correlation, at least in terms of metamorphic grade, between the high-grade rocks of the BHD in NSW and the rocks in the western OD. Mafic and pelitic, granulite-grade metamorphic rocks were mapped in the poorly exposed outcrops of the South Australian portion of the BHD. P-T calculations made using the garnet aluminosilicate-quartz-plagioclase (GASP) geobarometer, intended to constrain the peak metamorphic pressures for the inferred M1 assemblage, returned a pressure range of 4.6-5.6 kbar (±1.22 kbar). Retrograde metamorphism (M2) of the area is thought to have occurred at slightly higher pressures (minimum of 5 kbar) than the M1 metamorphism. Sm-Nd garnet dating from the Kings Dam Shear Zone and the Mutooroo Shear Zone gave apparent ages of 502±12 Ma and 517±14 Ma respectively. A pooled metamorphic age from monazite U-Th-Pb chemical dating returned an age of 500±16 Ma, indicating that the peak shear-zone assemblages formed during the Cambrian (c. 500 Ma) Delamerian Orogeny. Regolith mapping accompanied geological mapping on the Mingary 1:100 000 map area. A well-developed weathering profile is present on basement rocks. Subsequent erosion has removed the weathered materials from the highest parts of the eastern Olary Ranges, which form a major drainage divide, and transported these into the Murray-Darling Basin to the south and the Lake Eyre Basin to the north. Remnants of the old residual land surface are preserved along the northern flank of the ranges. The ability to recognise the residual, erosional and depositional regimes is critical to the design of good geochemical sampling programmes, as each regime will affect element dispersion haloes in significant ways. Mineral occurrences have been known on the Mingary 1:100 000 map area since the late 1800s with the discovery of copper and gold mineralisation in the Mutooroo and Luxemburg areas. Following this, uranium minerals were discovered in the early 1900s in the Radium Hill area. Mineral exploration continued intermittently from this time until the present, and various other mineral deposits and prospects have been discovered, including the White Dam deposit.