Predictive mineral discovery is concerned with the application of a whole of system process understanding to mineral exploration as opposed to an empirical deposit type approach. A mineral system process understanding can be derived from a consideration of five key questions, namely what is/are the: 1) geodynamic setting; 2) architecture; 3) sources and reservoirs; 4) drivers and pathways, and; 5) depositional mechanisms. The answers to these questions result in the identification of critical processes necessary for the function of a mineral system within a particular terrane, and permit the development of a targeting model. In this contribution we identify district scale critical orogenic gold mineral system processes for the late Archaean eastern Yilgarn Craton of Western Australia. During the geodynamic history of a terrane the critical processes which result in mineralisation change with time resulting in variations in mineralisation style. Proxies for critical processes have been mapped in an integrated GIS and are termed mappable mineral system process proxies (or MMSPP). In recognition of this, three separate time slices and a geochemical theme were analysed. Each MMSPP is given a weighting factor (WF) which reflects the spatial accuracy/coverage of the data and process criticality. For each theme/time-slice, a separate prospectivity map was created by summing the overlay or union of the spatial extent of each MMSPP, and adding the WF. A final target or prospectivity map was generated by a union of the four theme/time-slice prospectivity maps, and is tested against the known major deposits. The map 'discovered' the main gold camps and accounts for over 75% of the known gold in 5% of the area. This test verifies the process-based understanding and the appropriate mapping of the critical proxies. A further outcome from the map was the identification of a number of new target areas not known for significant gold mineralisation in what otherwise is thought to represent a mature terrane for gold exploration. The approach taken here has been to consider the Late Archaean gold deposits as a holistic system. Despite the recurring areas of uncertainty, this systems view has resulted in new findings that have generic applications to other mineral systems.

Teaching Materials - Lecture N1 Modeling philosophy

I2+3 Mt Isa Eastern Succession Program Poster

Origin of Proterozoic Wernecke Breccia and associated IOCG Mineralization

3D successions of near-orthogonal progressive bulk inhomogeneous shortening resulting in multiple generations of folds in the Mount Isa Inlier

Statistical Evaluation of potential critical ingredients for potential critical ingredients for the IOCG Deposit Model the IOCG Deposit Model & Melt inclusion Pilot Study

Deformation Zone Architecture, Reactivation and Mineralisation Processes in the Eastern Succession of the Mount Isa Inlier

Structure and Metamorphic Evolution of Key Areas in the Eastern Fold Belt, Mount Isa Inlier Poster, Mohammad Sayab

Lecture N4 Transport and reaction modeling

Mapping Mineralogical and structural relationships with satellite-borne ASTER and airborne geophysics at Broken Hill