An area covering the valley of the River Murray between Murray Bridge and Jervois has been explored for possible economic placer occurrences of heavy mineral (HM) sands that may have formed within the Late Tertiary Murray Basin shallow marine clastic sedimentary sequence (Loxton and Parilla sands). During the first stage of the exploration history reported on herein, licence operator/JV partner Australian Zircon NL drilled 87 exploratory aircore holes for a total penetration of 2002 m along two north-south traverses in November 2007 [but the data is not included here - to obtain it, see Env 9514]. Drillholes were generally spaced 100 m apart, with some infill holes put in at 50 m spacing. This drilling failed to locate potentially economic concentrations of HM, but yielded encouraging geological information. This work followed upon the conduct of initial desktop studies of HM prospectivity, and a review of previous explorers' drilling data. Drill targets were selected based on known earlier HM intercepts, and on structural/stratigraphic interpretations of aeromagnetic/radiometric data from a survey that had been flown in April 2001. After Murray Zircon began exploring the subject area in mid-2012, it drilled a total of 35 open vertical RC aircore holes for 1224 m at variable, >100 m spacing along two, north-south and east-west traverses. Holes were sampled at 1-metre depth intervals, and were logged with a gamma ray tool at the cessation of drilling. A total of 219 drill cuttings samples, estimated from hand panning to contain HM of interest, were submitted for laboratory heavy mineral analysis. Drilling commenced at the eastern end of the E-W traverse, and found that the sediments there have a partly calcareous framework, although it is not entirely calcareous. This calcareous nature persists along most of the E–W traverse. A minor HM accumulation was encountered half way along the traverse (2 m @ 3.0% HM). It contains an abundance of light coloured HM with a pinkish hue. XRF analysis of the mineralised samples showed only a 2.0% zircon content, while a large proportion of alumina and silica pointed to garnet as the likely major HM species. The RL of the HM intercept is ~30 m: this corresponds to the RL of granites outcropping to the west of the tenement area. Drilling done along the north – south traverse revealed a more siliceous clastic sedimentary sequence having fine to medium, well sorted grains. In one or two of the holes there were trace to minor HM. Some infill drilling was done, but no significant (>1%) HM accumulations were identified. Hole MZX6137 intersected 1 m @ 1.55% HM from a depth of 14 m, at an RL of 12 m. Observation of the HM assemblage from this intercept also showed very little zircon but an abundance of clear minerals with a pinkish hue, most likely aluminosilicates. Murray Zircon now considers that the results of the drilling which it has conducted on EL 4819, along with the results of drilling previously conducted on EL 3383, and also done lately nearby to the north and west of it, are sufficient to rule out the probable existence locally of any significant accumulations of HM. Consequently, a decision was made to fully surrender tenure.