Reward Minerals Limited announced that it has now completed four exploration drill holes in its Officer Basin (OB) exploration program, being conducted 100 km east of Lake Disappointment (Kumpupintil Lake) in Western Australia. Brine samples collected during pumping of completed drill holes confirmed potash rich groundwater occurring at depths of between 18 - 87m below surface. The dissolved ion ratios for the OB brines have been plotted on the conventional Jänecke Phase Diagram in Figure 1. The plot suggests that a crude Potash harvest from an OB1 brine may have significant Glaserite K3Na(SO4)2 content hence a high potassium grade. Pure Glaserite analyses 35.3% K versus 44.8% K for SOP. The first drill hole (OB01) in the program was drilled with a mud rotary/tricone pre-collar to a depth of 59.5m and then with HQ triple tube (HQ-TT) diamond coring to a depth of 192.1m. This initial section of the hole was subsequently deepened with HQ-TT to a final depth of 419.45m after reaming and casing off following drilling difficulties. Substantial sub-artesian flow of brine was encountered at 87.1m depth. The inflow brine contained encouraging potassium and sulphate values. The deepening of OB01 was designed to test for potash rich evaporites that may be contained within Browne Formation units at depth within the Gibson sector of the Officer Basin. Hole OB01 encountered drilling problems and was cased-off with HQ-TT and continued with NQ triple tube (NQ-TT) diamond core tail. Due to these difficulties OB01 was ultimately abandoned at a final depth of 419.45m and a second stratigraphic drill hole (OB02) was collared 230m to the southwest along seismic line N83-01. OB02 was drilled using an 8-inch diameter mud rotary/tricone pre-collar to a depth of 144m. The pre-collar was cased with 125mm diameter PVC to a depth of 135m. The hole was then continued to a depth of 251.9m using a polycrystalline diamond compact (PDC) bit. Subsequently the hole was cored with HQ-TT to 485.7m and NQ-TT to a final depth of 705.6m. While analyses of drill core from OB01 and OB02 have not yet been completed, it appears that no water soluble evaporites were encountered in these two holes. Following the positive brine flow and chemistry of groundwater in OB01 and OB02, shallow holes OB03 and OB04 were drilled 3.5 and 6.5 km south west of OB01 respectively, along seismic line N83-01. Both holes OB03 and OB04 encountered significant groundwater inflow and test bores were constructed using slotted PVC casing and gravel packing to allow pumping and sampling of aquifers to be completed. Pumping from a depth of 35m in both holes delivered potash rich brines with compositions very similar to that intersected in OB01 at 87.1m and later pumped from a depth of 45m. Further pump tests are required to assess aquifer depth extent, long term yields and variation in brine chemistry. However, results to date are encouraging. Importantly the brines obtained to date contain potassium and sulphate concentrations that appear suitable for SOP production. The relatively low sodium to potassium ion ratio (Na:K) in the brines is also encouraging as it would lead to less waste salt (NaCl) being generated per unit of SOP produced.