MR 244 and MR 244 Marble Creek Area - Tennant Creek

Abstract

Current uncertainty about future exploration active in the Warramunga Group, Tennant Creek suggests the Government through NTGS should attempt to encourage confidence in the area. Thus I recommend a high priority be given to further work on MR 244, were magnetic features exist which are thought to indicate a good amount of mineralisation. MR 244 is located between 30 and 40 kms SSE of Tennant Creek, its boundaries, geology and geophysics are shown on the accompanying maps. Quartzite of the Hatches Creek Group lying, probably unconformably, over siltstone and shale of the Warramunga Group form ridges in the south of the area of interest. Prominent granitoid outcrop in the SE forms an intrusive contact with the Warramunga Group. The central area may be underlain by basic rocks as indicated in 'Kelly Well' water bore which shows a gravity high in the magnetics. The exploration target is the magnetic ridge running NW-SE, of approximately 300 gamma intensity. Three causes for this ridge can be suggested at this stagee; 1 Granitoid contact effects - the magnetite possibly expelled from the granitoid, 2 Magnetite in basic dyke rocks, and 3 Magnetite sediments of the Warramunga Group, possibly containing concentrations of magnetite and economic minerals similar to Tennant Creek type orebodies.