SP44: Chapter 4: Initial Results of Weights-of-Evidence Modelling to Assess the Mineral Potentia
by P. Honarvar, C.T. Barrie and J.R. Harris.
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This chapter is from GAC's Special Paper 44: "GIS For the Earth Sciences" editted by Dr. Jeff Harris. To purchase the entire book in hardcopy or disc formats, please see the Special Papers section of our bookstore.
ABSTRACT: A mineral potential mapping study is presented to highlight the gold and base-metal potential in an area of thick glacial cover in the Abitibi Greenstone Belt of Ontario. This area is within 45 km of the prolific Porcupine gold district and with-in 15 km of the giant Kidd Creek volcanogenic massive sulfide deposit. Evidentiary geochemical, geological, and air-borne geophysical layers are compared to the spatial distribution of 39 mineral prospects, occurrences and one small deposit (geological resource of 150,000 metric tonnes at 0.10 oz./T Au) for a 10 by 20 km area, using a GIS-basedweights-of-evidence modelling technique. A simple binary evidentiary scheme is used for each data layer, where eachmulticlass map is analyzed by weights of evidence to determine the optimal threshold value for converting it to a binary map. Of the eleven layers considered, the layers with the highest spatial association with known mineral occurrences are fault buffers, apparent conductivity, magnetic field, Au index, EM x-coil decay constant, Eu anomaly values, Cu-Zn index and buffered contacts. These layers are then combined in a log-linear model using the weights-of-evidence method to build a mineral potential map. The final mineral potential map highlights three new target areas for gold and base-metal potential. The associated uncertainty map provides further information to prioritize the targets. This logical and systematic modelling exercise is an excellent, relatively unbiased procedure for developing new exploration targets in areas of thick glacial cover, where a significant number of occurrences or deposits are known within a study area.
Geological Association of Canada
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