Mineral Potential Modelling for the Greater Nahanni Ecosystem Using GIS Based Analytical Methods |
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| Authors: | J R Harris D Lemkow C Jefferson D Wright H Falck |
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| Institution: | 1.Geological Survey of Canada,Ottawa,Canada;2.Geological Survey of Canada,Ottawa,Canada;3.Northwest Territories Geoscience Office,Yellowknife,Canada |
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| Abstract: | Mineral potential within the Greater Nahanni Ecosystem (GNE) was modelled in a Geographic Information System (GIS) for four
different deposit types: (1) SEDEX (stratiform shale-hosted sedimentary exhalative Zn–Pb–Ag), (2) ‘Carbonate-Fault’ (carbonate-hosted
zinc–lead–silver associated with major faults), (3) ‘Intrusion-Related’ (includes skarn, rare metals and gemstones) and (4)
Carlin-Type gold as lode and/or derived placer deposits. This mineral potential modelling study integrates data collected
during the Nahanni Mineral and Energy Resource Assessment (MERA) undertaken from 2003 to 2007. The results have contributed
to the process of determining the geographic boundaries of the proposed expansion of the Nahanni National Park Reserve. Four
mineral potential maps were produced (one for each deposit type) using a knowledge-driven approach. A weighting scheme based
on integrated mineral deposit and regional geological knowledge was derived for the various evidence maps for each deposit
model using expert opinion. The four potential maps were then combined into a final potential map using a maximum operator.
Plots showing the efficiency of the models (mineral potential maps) for predicting the known occurrences of the four deposit
types show that partial data sets provide reasonable predictions of the remaining known mineral prospects, occurrences and
deposits. Hydrocarbon potential from Nahanni MERA 1 was added to the final potential map to ensure that both mineral and energy
potential data were incorporated into the park configuration modelling. |
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