Structure, setting, and petrography of the Raudvatnet sulphide deposit, Hattfjelldal, Northern Norway

• Main Author: Svennungsen, Robin Orre
• Format: Master Thesis
• Language: English
• Published: 2016
• Subjects: Bjørkvatnet; Hattfjelldal; Norway; Nordland; Northern Norway
• Online Access: http://hdl.handle.net/10852/53262; http://urn.nb.no/URN:NBN:no-56528

The Raudvatnet massive sulphide deposit is located in Hattfjelldal in Nordland, Northern Norway. Deposit investigations have been made by mining companies Boliden AB and Aspro AS in the 1960’s and 1980’s respectively. The Deposit lies in the Bjørkvatnet Nappe belonging to the Lower Køli Nappes of the Upper Allochthon in the North Central Caledonides. Brief structural investigations in the area along with petrographic, geochemical studies were conducted on a selection of samples collected in the field, both from mineralized ore horizons and adjacent lithologies. Geological mapping was conducted to produce an updated geological map of the area along with creation of 4 cross section profile sketches produced from the combined impressions of surface mapping and 4 of the logged drill cores. Geochemical analysis of the host rock of the mineralisation yields a sericite altered quartz keratophyre, which in turn is an altered felsic metavolcanite. The associated metabasites in which the felsic sequence is situated yields anN-MORB type geochemistry. The deposit contains abundant Zn andCu and is classified as a Zn-Cu compositional type. In addition, there are substantial amounts of Pb, Ag and Au as found in various phases associated with the massive mineralisations present. The deposit is characterized as a Kuroko type VMS deposit and is recognized as being a Bimodal mafic type in terms of lithostratigraphic classification.