Exploration on the Ewaninga Area, Alice Springs, NT for period 07/06/1974 to 06/06/1975.

Abstract

During the reporting period, an airborne and ground spectrometers survey of over 100 survey miles was carried out over the eastern and southern parts of the EL. In addition, a number of areas of particular interest were surveyed by footborne scintillometer on small grids scale. Shallow vacuum drilling was carried out over the eastern and southern parts of the EL to obtain geological information and give penetration to a scintillometer survey. 473 holes of 4 to 5 metres deep were drilled. A radon monitor (emanometer) was tested in the Angela Anomaly. This was used in a detailed survey over a radiometric anomaly in the south of EL and was also used at the western margin of the EL. Geological mapping was carried out parallel with other survey methods and was aided by interpretation of hight quality of colour air photographs. A tongue of reduced sandstone in the generally oxidised Undandita Member was delineated which contained uranium mineralisation at the margins. The two main anomalous areas along this margin were covered in diamond/percussion deep drilling program of 34 holes. The margin of the reduced zone was found to be everywhere slightly mineralised. Stronger concentrations were found in the Angela Anomaly area where a zone of interfingering oxidised and reduced sandstone occurs. Here, a zone of high concentrations of primary uranium mineralisation was encountered.