Campbell provided another of his earlier reports of possible interest, pursuant to his intent expressed in a recent publication (here). He reported in 1969 that a preliminary field reconnaissance northwest of Ceduna, South Australia, in the Pidinga Lake-Lake Tallacootra-Red Lake-Seven Mile Swamps Areas has revealed significantly high radioactivity in the sedimentary rocks of Tertiary age on the eastern edge of the Nullarbor Plain. Subsequent mineralogical studies reported that radium in minor proportions has been tentatively identified as the major radioactive source. Other radioactive minerals are also present and are geochemically anomalous. The investigations suggested that while the anomalous radioactivity was found to be restricted to minor discontinuous outcrops and to minor intervals found at the near surface of saline lagoons, many of the classical lithological prerequisites for a sedimentary uranium deposit nearby are present in the areas inspected. Since only a relatively few shallow auger holes were completed during the reconnaissance, additional work is highly recommended to test selected areas in and around the reconnaissance localities.
A post-report mineralogical study indicated that radium minerals are present in the high-radioactively zones sampled, one in the form of a light lime green radium mineral. Further, the dry lake area from which the samples were cored and taken for mineralogical study is clearly a groundwater discharge zone. A comprehensive hydrogeological study in the general area was recommended to management. Also see: https://i2mconsultants.com/downloads/mdcampbell/SouthAustraliaUEX.htm
Drilling and follow-up sampling programs were conducted by others after Mr. Campbell was reassigned in 1969 to the Conoco Denver Uranium Group, under Ludwig Koch, and based in Casper. Wyoming.
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