Two adjoining areas located on the eastern margin of the Eucla Basin, and centred ~60 km north-east of Fowlers Bay, are being explored for possible buried economic occurrences of zircon-rich heavy mineral sands (HMS) that may have been formed along palaeo-beach and shoreface strandlines during the five marine incursions that occurred from the Middle Eocene to the Pliocene. Winnowed sandy sediment horizons of the Hampton Sandstone and Ooldea Formation are the target host strata for mineral sands deposits. UTS Geophysics conducted a low level airborne magnetic/radiometric/DTM survey in the eastern Eucla Basin region between December 2010 and May 2011, which included coverage on the now relinquished areas of ELs 5539 and 5564. The survey was based out of the Jacinth mine, flying NE-SW lines spaced 100 m apart, using a mean sensor height above the ground surface of 20 m. The radiometric raw data were processed by a consultant geophysicist into a number of composite and ratio plots using the uranium, thorium, and potassium bands. These plots were used to select radiometric anomalies for surface sampling and drill testing, which lay on interpreted shorelines located between the Ooldea Range and the Barton Range. The region behind the Ooldea Range is known as the Bay of Plenty, a crescent shaped region of eroded marine sediments, strongly basement controlled to the north and south. Marine sediments and indications of preserved HM concentration have been identified throughout the Bay of Plenty in previous drilling programs. The easternmost edge of the Bay of Plenty is host to the Mojave and Kalahari deposits lately discovered by Iluka, and is thought to represent the most eastwards extent of past Tertiary marine incursion into the Eucla Basin. Geomorphic and radiometric anomalies were followed up for finding possible buried heavy mineral sands strandline accumulations by much exploratory aircore traverse drilling conducted by Iluka, in campaigns performed in years 2004-2006, 2008-2009 and 2012-2013 on EL 5539 and its precursors, with 1004 vertical open holes drilled for a total penetration of 45,556 m, and 4740 selected drill cuttings samples being submitted for laboratory heavy mineral analysis; on EL 5564 and its precursors, the same type of drilling occurred in 2009 and 2012-2013, with 226 holes being drilled for 10,608 m, to obtain 1371 sediment samples which were analysed. In general, HM intercepts were inconsistent and of low grade (<1% up to 3%), with one only significantly anomalous sand lens in hole YE3198 recording 6 m @ 4.5% HM. A recent review of Iluka’s comprehensive drill and assay database, geology and local HM mineralisation models which have been progressively developed for the subject tenements has identified the Gobi prospect, which in part lies on both ELs, as probably constituting the most favourable exploration target: it is situated along the southern strike extension of the previously discovered Mojave-Kalahari mineralisation trend. Therefore Iluka will retain the westernmost part of EL 5539 and the eastern part of EL 5564 overlying the prospective Mojave-Kalahari-Gobi area, and undertake further exploration of the Gobi area. Both of the subject tenements were subject to a farm-in and joint venture agreement that Iluka made with Doray Minerals Limited in November 2014, that continued until May 2017. Doray wished to explore for gold and other metallic minerals that might have formed economic deposits within the basement or overlying cover. To detect dispersed pathfinder elements from inferred hydrothermal, shear-hosted primary gold ocurrences or from buried magmatic Cu-Ni occurrences, Doray conducted its own regional reconnaissance aircore drilling to geochemically sample the sedimentary section and the top of underlying bedrock. On the relinquished portion of EL 5539, 1137 vertical open holes for 57,494 m were drilled during 2016, and 4740 drill cuttings samples were submitted for laboratory multi-element assaying. 715 other drill samples were also analysed whilst drilling by using portable X-ray fluorescence (pXRF) spectrometric devices to collect additional geochemical data. On the relinquished portion of EL 5564, 30 vertical open holes for 2318 m were drilled during 2015, and 1492 drill cuttings samples were submitted for laboratory multi-element assaying. Doray collected 1492 regolith samples from Iluka drillholes that had entered basement within EL 5564, and submitted them for multi-element assaying. Another 1502 of Iluka's historical, stored drill samples were tested by the pXRF method. The new Doray drillholes were sited on a nominal 200 m x 400 m grid spacing, and many recovered hitherto unknown basement rock material from previously undrilled localities that enabled new knowledge of subsurface lithologies and alteration, but did not encounter any interesting mineralisation.