A large area located in the far north of South Australia, abutting the Northern Territory border ~120 km north of Marla, and centred ~30 km east of the Stuart Highway wholly on Tieyon Station, has been explored for possible economic buried secondary uranium deposits, which Tianda Uranium (Tianda) thought could exist as chemically precipitated deposits in either the Jurassic Algebuckina Sandstone, or within Quaternary to Recent calcrete horizons that might have formed in palaeodrainage channels within the tenement (as for the Yeelirrie, WA style of uranium deposits). The uranium's likely source is local Proterozoic crystalline bedrock of the eastern margin of the Musgrave Block, particularly adamellite, which in some places has a high uranium content. During the first licence year, geological mapping undertaken along the Hamilton Creek valley during an initial reconnaissance field trip revealed that calcrete deposits at least a metre thick are present in gullies along a considerable length of the creekbank. These are often overlain by a layer of unconsolidated orange-red aeolian sand. Elsewhere, rabbits making burrows had exposed many pieces of calcrete, and therefore it was supposed that streambed calcrete is much more extensive in the shallow subsurface than has been mapped. An extensive calcrete horizon, covering about 50 ha, was found near the confluence of Atounga and Hamilton Creeks. From an examination of existing airborne radiometric survey uranium channel data, the sediments of Atounga Creek upstream of this calcrete were noted as being radioactively anomalous. It was decided that this calcrete should be investigated for possible uranium accumulations near the base of the lens. Another extensive calcrete outcrop was located about 1 km west of Tieyon Homestead, downslope from numerous small kopje exposures of radioactive granite (where the surface radiation was measured by hand-held scintillometer at up to 1300 cps). 10 grab rock chip samples of calcrete were taken from two roadbase borrow pits and were assayed by ICP analysis for a suite of 20 elements, while 22 other rock chip and 46 x minus 80 mesh size fraction soil samples were collected from sites located elsewhere in the tenement and were assayed by ICP-MS for 61 elements. Groundwater samples obtained from eight water bores lying within the tenement and from another seven situated nearby were assayed for a suite of trace elements that might be dissolved in the groundwater. A broken and dispersed silcrete residuum (eroded Cordillo Silcrete scree) was found to be present in many places in the north of Tianda's northerly adjoining EL 3873 Boundary Dam and especially in the east and south of the subject EL 4493. It is visible while driving south from the Kulgera - Finke Road as forming the caprock on mesas. Spoil heaps remaining from historic drill sampling, and some rabbit diggings, showed that the Algebuckina Sandstone lies beneath this residuum. It was decided to acquire a helicopter-borne EM survey to try to delineate buried palaeochannels, as it was thought that these should offer the best prospects for accumulation of significant amounts of uranium at redox interfaces. So, during May 2011, Geotech Airborne was contracted to fly part of a multi-licence coverage helicopter-borne VTEM survey for Tianda over the Hamilton Creek floodplain section lying within the EL 4493 licence area. Here a total of 199 line km of EM and aeromagnetic data were acquired along east-west flight lines spaced 3.2 km apart, utilising a 49 m mean sensor altitude above ground level. The resulting AEM data appeared to define several discrete, well-developed and roughly north-south trending buried palaeochannels running down the western side of the tenement, as well as outlining some shorter palaeochannels in its central and eastern parts. During licence Years 2 through 5, no field work was done. Starting in 2012, plans were made to drill test inferred palaeochannel targets at depths of down to nearly 80 m, via short traverses of drillholes spaced 200 m apart. A programme of 30 holes for about 2000 m of drilling was envisaged. Land access negotiations were begun with local stakeholders, including for arranging to perform aboriginal heritage protection work area clearance surveys. In May 2014, Tianda relinquished a 218 square km portion of EL 4493 that was deemed to have little prospectivity for secondary uranium mineralisation to occur either in a sandstone hosted unconformity type deposit, or in calcrete, because this ground consists largely of outcropping basement granite. Shortly after the end of licence Year 5, Tianda decided to withdraw its recently submitted application for tenement renewal, citing the influence of adverse conditions affecting the uranium exploration industry.