Continuing exploration by Delhi of the industrial salt potential of subsurface brines in the Lake Torrens basin aimed to ascertain the potential reserves of NaCl in the southern part of the lake, and to confirm the availability of suitable brine crystallisation pond sites, both being critical requirements for planned salt production to supply needed chemical raw materials to the proposed Red Cliff Point Petrochemical Complex on northern Spencer Gulf. The principal work included lake sediment and brine sampling via excavations of test trenches and pits using an amphibious dragline, performing detailed geochemical and petrographic analyses of the brine-rich deltaic sediments, and conducting hydrological pump tests and making observations of groundwater flow parameters during brine drawdown and recharge, plus measuring local evaporation rates, carrying out laboratory studies of bulk brine extract crystallization and salt beneficiation methods, and preparing estimates of the economic in-situ salt resource. The area of detailed study covered some 90 square miles, within which it was found that useable high density natural brine with ~20% NaCl content occurs within 40-50% of the volume of near-surface lacustrine sediments, rising to 20-50 cm depth below the surface. To evaluate the brine supply potential, porous sandy units were excavated by the dragline in the form of 10 long open trenches 17 feet wide, 1000 up to 2500 feet long, and 14 feet deep, and also in 99 smaller test pits of just 20 foot length but similar width and depth. This work showed that the sediments may consist of up to 89% sand (+240 mm) and contain up to 25% of pore fluids, measured on a weight:weight basis. Important ancillary activities undertaken included the designing of a solar salt harvesting plant, conducting material corrosion tests, compiling long-term meteorological data to assess lake flooding risk, making a remedial engineering survey of the damaged Point Paterson salt works seawall, commissioning an environmental impact investigation of utilising this site and comparing the results with known impacts at other existing salt processing sites, and latterly, performing auger drilling in the Yorkey Crossing (Playa 3) area to determine whether salt crystallising ponds could be built there. The exploration geotechnical and engineering data, professionally evaluated for Delhi and the South Australian Department of Mines by Dow Chemical Co., Coffey and Hollingsworth Pty Ltd, and consultants C. Bleys and K.C. Dodd, were in general deemed to indicate that the lake sediments are sufficiently permeable to allow brine extraction, and that the accumulated brine exists in adequate amounts, to render the proposed project economically viable. Delhi have estimated that an in situ salt resource of 32.2 million tonnes of NaCl exists near surface within four sand-prone areas covering 18,000 acres which lie above the toe of the Willochra Creek Delta (Foreset Areas A & B). They envisage that salt production of 460,000 tonnes per year may be feasible to obtain from a currently calculated total recoverable NaCl reserve of 2,810,000 tonnes. This production would take place by extraction of seeping brine from 30 km of trenches dug about 1 km apart over 22 square km of the delta foreset areas.