Borroloola - Uranium Exploration

Sandfire has identified a 40km strike length of the basal unit of the McArthur Basin which is prospective for uranium mineralisation.

The Yiyintyi Sandstone is in unconformable contact with the underlying Scrutton Volcanics, an acid volcanic unit. This geological setting is comparable to that of the basal McArthur Basin, Paleoproterozoic unconformity related uranium deposits in the East Alligator Uranium field, some 420 kilometres to the northwest.

The unconformity occurs at shallow depths, typically under 20 to 50 metres of flat-lying Cretaceous cover which would have concealed any uranium mineralisation from ready detection by airborne radiometric surveys.

Interpretation of Sandfire’s airborne electromagnetic survey data over the prospective Scrutton Volcanics indicates that conductive features in these basement rocks that may have acted as focus localities for deposition of uranium.