The importance of the Rum Jungle deposits required a geological survey of the surrounding district to determine whether or not additional deposits were to be found. None have been found as a result of the work so far completed. This work is also intended to contribute to a larger scale compilation of the regional geology of the Northern Territory. The rocks of the area include metasediments (some of which are tuffaceous) which are intruded by granite, quartz and quartz-tourmaline veins and dolerite dykes. The metasediments are assigned to the Brock's Creek Group of Lower Proterozoic age, (Noakes, 1949). The original sediments were deposited in a shallow-water geosynclinal environment close to a granitic (?) land-mass. Granites intruded the sediments towards the close of geosynclinal development. Diastrophism, which extended over a wide area, caused strong folding, brecciation, possible thrust-faulting and transcurrent faulting close to the granites. Gold, copper, and uranium have been found and mined in the area. The gold is associated with quartz and quartz-tourmaline veins. The genesis of the copper and uranium deposits has not been satisfactorily determined. Only uranium and associated copper are being mined today.