The entire extent of the main Lake Frome salina was taken up in early 2015 with three contiguous licences covering a total area of 2718 square km, to explore for a salt lake brine potash resource which might be economic to develop to supply the local agricultural mineral fertiliser market. According to information supplied by the licensee, Australia has no producing potash mines. Around 350,000 tonnes of potash is imported into Australia annually from Canada and is worth around $200 million. Sulphate of potash, and schoenite (synonym picromerite), are utilised as high-end fertiliser products globally, as they have a lower salt index than muriate of potash and are often preferred in cases of growing crops sensitive to chloride or susceptible to fertiliser burn. Sulphate of potash and schoenite attract premium pricing in comparison to the more common muriate of potash. During the first licence year, Rum Jungle Resources carried out preliminary negotiations with the Adnyamathanha Traditional Lands Association who represent the Native Title Traditional Owners of the lake, besides conducting a literature review and an assessment of the work performed by previous explorers. Desk-top studies to assess the prospectivity of subsurface brines were undertaken. A proposal for new initial exploration work to be undertaken (brine sample collection from shallow hand-auger holes) was submitted to the relevant authorities and stakeholders. It was resolved that the preferred means of access to the lake surface in this instance would be by helicopter. During Years 2 through to 4, the licensee unexpectedly encountered protracted delays in obtaining an agreement with the local Aboriginal custodians for gaining access onto the lake, so no field work occurred. Eventually it was decided to surrender the subject licences because there appeared to be no prospect of ending the access impasse. Although this situation was the principal cause of the company's decision to end tenure, Verdant Minerals by this time had also determined that to fully test the brine potential of the lake strata would necessitate sampling done in multiple drillholes systematically located over the postulated east-west variation in lake stratigraphy, where these holes should probably extend to >100 m deep but not penetrate the Great Artesian Basin aquifer. The soft lake surface almost certainly dictated using a specialist drill rig with a very low psi footprint that must be capable of drilling to, and lifting brine samples from, the required depths. It was concluded that utilising such uncommon drilling equipment would be beyond the scope of funding available for the project.