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BACHELOR THESIS: 3D modelling of hydrothermal altera>on and Au mineralisa>on in the Nuuluk area
Tartoq gold province (SW Greenland)
Sara E. Hoffritz Done in co-‐opera>on with University of Copenhagen and Geological Survey of Denmark and Greenland
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Nuuluk
Figur Map showing location of Nuuluk in SW Greenland and the regional geology. Map is modified after GEUS (figure: Henriksen 1968, Escher og Jensen 1974, Jensen 1975)
Figur Map of the loca>on of different drill cores (red dots), both diamond drilling in the west and winkie drillings in the east along with surface samples shown by their gold value (Figur: King,1985)
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Background
• More than 40 years of explora>on • Two parallel altera>on zones of old meta-‐volcanics in a classic greenstone belt which has been hydrothermally altered by carboniferous fluids
• Rock types are schist and hydrothermal altered meta-‐volcanics
• 12.30 ppm in the Eastern zone
• 6.63 ppm in the Western zone
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METHODE
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Cross sec>ons
DH5 125m
surfaceAu (78 ppb, projected)
Au (132 ppb, projected)
Au (730 ppb/2m)Au (217 ppb/2m)
West East
Pro!le A
DH1 134 m
DH2109 m
Au (6.65 ppm/2m)
Au (86 ppb/4m)Au (516 ppb/2m)
Au (61 ppb) Au (887 ppb)
DH3
DH4
surface
Au (127 ppb/4m)
Au (68 ppb/4m)
97 m
109 m
West East
DH1 & DH2 DH3 & DH4
DH5
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Geochemical features Profile log and sample analysis
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Imported data
From reports from Nunaoil, Greenex and GEUS
• Drill hole data – Loca>on, depth, azimuth and dip – Lithology – Measurements of Au, As and Cu
– Structural measurements
• Surface samples -‐> topography
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Lithology
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Lithology
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Lithology -‐ Structures
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Gold occurrences
Western upper zone
Eastern, northern zone
Western lower zone Eastern, southern zone
HALOES: Red: 95< ppb (!) Orange: 80-95 ppb Yellow: 60-80 ppb Bright: 50-60 ppb
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Lithology + Gold occurences
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Results • Modelling of gold volumes are possible in spite of low values and gives a good idea over the poten>al in the area
• The gold is in boundary zones with lower stability – but in different rock types – structures ?
• There are at least four mineraliza>on zones • Gold correlates with As and Cu • There is a connec>on with high gold values and the graphite-‐ and magne>te schist
• Old and new data can give a 3D view of the geometry of the gold occurrences
• More data is needed • GEUS: Project re-‐opened and area will be more inves>gated next field season