GOLD ENVIRONMENTS AND FAVOURABILITY

GOLD ENVIRONMENTS AND FAVOURABILITYGEOLOGY AND ORE 9 / 2007Rust zone in massive sulphide occurrence at Ivisaartoq.Gold favourability map for theNuuk regionData analysedSixty-nine different geoscientific datasets –including location of known gold showings,data from geological maps, streamsediment geochemistry, aeromagnetic data,aeroradiometric data and data from lineamentanalysis have so far been included inthe statistical analysis. All datasets are pixelated.A gold showing is in the currentstudy defined as a locality where a rockgrab sample has yielded >1 g/t Au.Resulting gold favourability mapBy using the identified common signaturefor gold showings, it is possible to estimatethe probability for similar data signatureswithin all pixels. It is not surprising thatareas immediately surrounding known goldshowings are predicted as favourable, butmore interestingly, a number of favourableareas are also predicted outside areas withknown gold showings.Grouping of gold showingsInstead of treating all known gold showingsas one group, it is statistically analysedwhether the showings should be splitinto groups according to common signaturesin the datasets. For the Nuuk region,this analysis resulted in the identificationof at three main groups of gold showings:the Storø, the Bjørneøen and the Isuagroup.Gold bearing rustzone in the Qussuk area.6