Developing Metallogenic Geographic Information Systems: Examples from Mount Isa, Kakadu and Pine Creek

Gallagher R, ; Jaques A L, ; Jagodzinski E A, ; Thost D, ; Ahmad M,
Organization: The Australasian Institute of Mining and Metallurgy
Pages: 0
Publication Date: Jan 1, 1994
Geographic Information Systems (GIS) are ideal tools for understanding regional geological controls of mineralisation in a province. Primary digital layers that can be incorporated for metallogenic analysis include geology (rock types, structure), geophysics (gravity, magnetics, gamma-ray spectrometric data), satellite images (SPOT, Landsat thematic mapper (TM) or Multi-Spectral Scanner (MSS)), mineral deposits, rock and surficial geochemistry. From these primary data sets, a series of derivative layers can be developed including solid geology, geological provinces, basement tectonic elements, metamorphic grade and rock geochemical maps. The individual geological units from the map can also be used as a basis for further data integration by classifying the units according to their age, dominant lithology and the proportions of the metallogenically reactive minerals present (K-feldspar, carbonates, magnetite, hematite, graphite, sulphide, etc). Interactive models can be developed for highlighting potential areas for most major ore deposit types by using two methods. The first involves determining which geological parameters are essential for their formation, and then utilising the GIS to determine which areas meet these criteria. The second method examines known areas of mineralisation within the GIS, and then determines the specific geoscientific expression of the ore deposit (eg magnetic signature, geochemical anomaly, proximity to faults etc).
Full Article Download:
(227 kb)