Detailed geophysical and geological investigation of the layered, mafic/ultramafic Black Hill Gabbroic Complex, Black Hill, South Australia

Abstract

A recently acquired aeromagnetic survey over the predominantly Cainozoic covered Black Hill/Murray Bridge region of South Australia (SA) revealed three magnetic bodies that were poorly defined by previous, regional-scale BMR aeromagnetic data. Outcrop and mineral exploration company drilling of the Black Hill gravity and aeromagnetic anomalies indicate that they are layered mafic/ultramafic intrusive bodies that have potential for PGE, chromite and Ni/Cu massive sulphide mineralisation. The current project of detailed ground geophysical surveys are part of the South Australian Governments phased, regional exploration strategy known as the Targeted Exploration Initiative South Australia (TEISA). The aim of this project and TEISA is to accelerate resource exploration in SA and send a strong message to the mineral industry that the SA Government is prepared to share some of the preliminary exploration costs. The geophysical surveys of this project revealed anomalism within the core of the northern Black HillGabbroic Complex intrusive. The data were interpreted and the gravity anomalism modelled, resulting in a proposed diamond drill hole and down?hole geophysical survey to test a layered mafic/ultramafic magmatic mineralisation model.