3D modelling of gold occurrence in SW Greenland

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    16-Jul-2015

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