What can we learn from GIS-based prospectivity mapping in mature terranes?

Ford, A., Witt, W., Hanrahan, B., and Mamuse, A. (2013) What can we learn from GIS-based prospectivity mapping in mature terranes? In: Abstracts from the FUTORES conference: future understanding of tectonics, ores, resources, environment and sustainability (68) p. 75. From: FUTORES 2013: Future Understanding of Tectonics, Ores, Resources, Environment and Sustainability Conference, 2-5 june 2013, Townsville, QLD, Australia.

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Abstract

This study used robust spatial statistics to systematically examine regional-scale targeting criteria that have been suggested for orogenic gold mineralization in the Yilgarn Craton. The spatial relationships between known orogenic gold mineralization and a series of targeting criteria were examined using both the number and endowment of the deposits. Both proximity and containment analyses were performed and a series of measures used to assess whether the geological feature being tested could be considered a good regional-scale targeting criteria.

Spatial analysis indicated the best targeting criteria for orogenic gold mineralization in the Yilgarn Craton are: containment within greenstones, proximity to mafic group granite intrusions, proximity to regional-scale fault bends, and regional fault density.

Using these targeting criteria, a fuzzy logic prospectivity map was generated. Fuzzy membership values were derived using the %endowment/%area statistic and the proximity and density threshold values set from the class at which the maximum %endowment/%area statistic was observed.

The spatial analysis revealed some surprising results, with several targeting criteria that were thought to have a strong relationship with orogenic gold mineralization in the Yilgarn craton shown to have weak relationships when a robust statistical analysis was performed. Due to the analysis focussing on the relationship between endowment and the geological features, it raised the question as to how much influence the Golden Mile had on the results. Separate analysis of the super-giant and giant deposits compared to the remaining smaller deposits indicated that controls on the large deposits may differ to the controls on smaller deposits.

Item ID: 40035
Item Type: Conference Item (Abstract / Summary)
ISBN: 978-0-9873109-7-2
ISSN: 0816-780X
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Date Deposited: 03 Sep 2015 01:37
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040399 Geology not elsewhere classified @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 100%
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