GOLD ENVIRONMENTS AND FAVOURABILITY

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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
GOLD ENVIRONMENTS AND FAVOURABILITYTop 137 km 2 most gold favourable area (1% of entire study area)52°W 51°W50°WInlandIceIsukasia65°NNuukregionIceGneissAmphiboliteMetasedimentUltramafic rockLate Archaean granitesFault and shear zonesIsua showingsBjørneøen showingsStorø showingsUngrouped showingsThe top 137 km 2 and 685 km 2most favourable areas for:Isua gold groupDavisStrait64°30'NFiskefjordNuukGodthåbsfjordSermitsiaqBjørneøenAmeralikStorøAQQooqqutIvisaartoqGodthåbsfjord25 kmBjørneøen gold groupStorø gold groupTop 685 km 2 most gold favourable area (5% of entire study area)52°W 51°W50°WInlandIceSimplified geological maps with the toprated 137 km 2 and 685 km 2 (respectively1% and 5% of the analysed area) outlinedas most gold favourable area for the threegroups of gold showings (Isua, Bjørneøenand Storø groups). Outlines of the rockunits are from digital versions of 1:100 000and 1:2 500 000 scale geological mapspublished by GEUS.65°NDavisStraitFiskefjordIvisaartoqIsukasiaBjørneøen64°30'NGodthåbsfjordStorøAQGodthåbsfjordSermitsiaqQooqqutNuukAmeralik25 km7
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Page 12: GEOLOGY AND ORE 9 / 2007Bureau of M

GOLD ENVIRONMENTS AND FAVOURABILITY

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