A group of seven adjacent licences were taken out near Cadney Park Homestead in the southern Arckaringa Basin region, extending for ~45 km to ~180 km north-west of Coober Pedy, to explore for possible buried Tertiary, palaeodrainage sediment-sourced, palaeomarine shoreface placer deposits of heavy mineral sands (HM). No previous exploration for this commodity had taken place there or nearby, but Diatreme Resources Limited (Diatreme) believed that the coastline of the proto Eucla Basin had formerly stretched inland as far as the location of these tenement areas, and it was hoped that any preserved strata of this coastline, if present, might be rich in HM occurrences which it was inferred had originally been sourced from the nearby Musgrave Block, and had become concentrated via fluvial processes that over time fed into marginal marine processes of longshore current drift and winnowing wave action. An additional exploration objective in this region comprised possible economic Permian coal deposits within the underlying Arckaringa Basin sediments, because a knowledge gap had been identified there arising from incomplete basin coverage by earlier drilling, both depth-wise and geographically. During the initial year of tenure, no field work was done. Instead, Diatreme was fully occupied by organising on-ground access onto Native Titleholder - controlled lands through the process of performing cultural heritage protection work area clearance surveys. Once the necessary permissions were obtained, it was planned to conduct reconnaissance stratigraphic drilling along existing seismic lines which had been constructed by Comalco Ltd in the mid-1980s, and along station tracks. During Year 2 of the project, access was granted following a cultural heritage survey that was carried out in April 2009. Following this, drilling was commenced during October-November 2009, when 66 open vertical aircore holes were completed for a total penetration of 3983 m. ELs 4110, 4111 and 4114, and the eastern parts of ELs 4112 and 4113, were all shown to have unfavourable stratigraphy, and were consequently fully surrendered / partially relinquished on 29/4/2010 (see Envs 12047 and 12011 respectively). Minor HM intercepts were made within poorly developed marginal marine sediments encountered on the more western located ELs 4112, 4113, 4136 and 4137. It was decided that further stratigraphic drilling would be needed to properly understand the controlling geology and extent of mineralisation. During Year 3 of the project, no field work was done. Despite Diatreme making exhaustive efforts to regain access into the Woomera Prohibited Area (WPA) and Tallaringa Conservation Park, neither request had been granted. During Year 4 of the project, after negotiations with the Commonwealth Government's Department of Defence regarding obtaining access to the WPA were progressed to a satisfactory conclusion, a second campaign of exploratory aircore drilling was conducted in November 2011, when 64 open vertical aircore holes for 2962.9 m were completed. Additional patchy mineralisation and strand development were identified along the margin of the DEM high within ELs 4136 and 4137, and in the south-western sectors of ELs 4112 and 4113. It was believed that this marginal marine sedimentation coincided with other such sedimentation elsewhere in the Eucla Basin, but the local depositional environment must have been relatively immature because it generated only thin sequences (<12 m) of fine or medium to coarse grained beach sediments interfingered with surf zone sediments containing some minor <1% HM mineralised silicified sand horizons. Below this sequence lies clay, the top of which dips southwards. Diatreme interpreted the overall sedimentary succession overlying the DEM high to be continental shelf sediments of the Bulldog Shale. It was postulated that the locally exposed silicified caps located on the tops of the ‘breakaways’ and elevated areas are Tertiary marine sediments that have been completely silicified through diagenetic processes. It was recommended that no further exploration be attempted on the tenements due to the envisaged ongoing significant difficulties in obtaining access to both the WPA and the Tallaringa Conservation Park. While it was likely that periodic access to the WPA would remain possible to utilise in the future, it was expected that gaining required access to the Tallaringa Conservation Park, especially via the cutting of new tracks in this wilderness setting, would prove to be forbidden. Thus, despite the prospectivity of the project's western side tenement ground remaining attractive, it was resolved to fully surrender all tenure.