The Nundroo Range and Bookabie Range are prominent south-west facing, yet effectively previously undrilled, preserved palaeogeomorphic beach ridge /coastal dune features which are located ~200 km west of Ceduna and ~100 km south of the Jacinth-Ambrosia heavy mineral sands deposits. A proposal was submitted to DSD in early 2015 by Iluka Resources for a grant of subsidy funding to assist the company with exploring a new heavy mineral sands exploration play centred on these potential basin erosion and entrapment features, and the project was approved in April 2015 as PACE Year 8 collaborative drilling project DPY8-30. The original proposed program design entailed the of drilling 120 vertical aircore holes for a total of 7500 m to test for the presence of Pleistocene Bridgewater Formation sands, for an eroded underlying scarp in the Miocene Nullarbor Limestone providing trap sites, and for detecting the presence of detrital heavy mineral sand (HM) accumulations. The only previous drilling that had been done in the subject region was by the Broken Hill Pty Co. in the 1960s, aiming to test the metallic mineral potential of basement targets at depth. No previous HM exploratory drilling had been conducted in the region. Iluka's preliminary investigation of the historic BHP drilling data indicated that there were two marine sand units that were possibly suitable for forming economic placer HM strandings, namely the Pleistocene Bridgewater Formation, and the deeper Eocene Hampton Sandstone. In particular, the more siliclastic Pleistocene Bridgewater Formation sediments intersected by BHP are fine to medium grained, are well sorted, are relatively clean, containing low to moderate slimes, and contain low grade (0.5 % and at least two samples either side of this were submitted to an Iluka-owned laboratory for analysis of HM content. Where a substantial zone of mineralisation was encountered, the entire drill hole was sampled. In total, 242 samples were submitted for assay, including 6 standards. On EL 5506 Penong, all six holes intersected well sorted, calcareous marine sands inferred to belong to the Bridgewater Formation, but the majority of them are barren of HM, or have very low background levels of between zero and 0.1% HM content as visually estimated. Some of the holes located on the eastern end of traverse EBT514 on EL 5477 Nundroo intersected low grade HM mineralised Bridgewater Formation. The strandline depositional setting behind the Nundroo Range appears to coincide with an interpreted basement fault, and lies adjacent to a granite headland. The best intercepts included 17 m @ 0.7% HM from 31 m, and 12 m @ 1.66% HM from 69 m in NDR014, and 9 m @ 1.5% HM from 40.5 m and 22.5 m @ 0.7% HM from 49.5 m in NDR021. Interpreted Bridgewater Formation strata were encountered along traverse EBT508 south of Colona on EL 5452, but only had trace HM content at its northern end. This mineralisation is observed to lie behind the Nundroo Range, like that seen on EBT514. A number of the holes on EBT508 intersected a sandy limestone unit towards their total depths, which is inferred to be the Nullarbor Limestone. No other HM mineralisation was intersected in the remainder of the DPY8-30 drilling, even though promising, well sorted marine sands were intersected. It was concluded by Iluka Resources that the prospectivity of the Bridgewater Formation in the eastern portion of the Nundroo Range and at the Bookabie Range has been sufficiently tested. The Hampton Sandstone is now interpreted to have formerly been deposited mostly inland of the Nundroo erosive embayment, at water depths well below the Eocene sea level, because none of the PACE drillholes encountered it. This result has therefore ruled out any chance of this particular unit acting as a re-worked HM source, because of its depth of burial.