Exploration for sedimentary uranium in the western Lake Frome region near Mount Chambers, conducted in conjunction with similar work on adjoining SMLs, has comprised sampling and analysis of groundwaters, an airborne scintillometer survey, and a reconnaissance open hole rotary drilling and geophysical wireline logging programme (11 holes, total 6313 feet). Results of the water sampling and aerial surveying were negative, but anomalous radioactivity was found in three holes, WY8, WY9 and WY10, apparently associated with thin silty partings in Tertiary claystones that contain some carbonaceous material, and coming from sources present on a possible redox boundary surface that is shown up by the change in colour (and ?age) of the claystone. The highest radioactivity reading recorded was 850 counts per second from a depth of 442 feet in hole WY8, in the extreme south of the licence area. However, this logged feature was shown by additional nearby drilling (3 holes, depth unknown) to be highly localised and probably of no economic significance. In general, the uranium prospectivity of the region is seen as poor, with no substantial development of sand units within 700 feet of surface.