Sandåen, Stulen, Skien kommune, Telemark fylke, Norge
Several small prospects and veins in the area. The small river Sandåen follow the fault between precambrian basement, consisting of granitic-gneiss and granitic-pegmatites and the Oslo-graben, consisting of cambrian-silurian sediments. This fault is going in NW-SE direction, with basement as foot-wall and Oslo-graben as hanging-wall. The quartz-fluorite veins are all related to the fault.
References
Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (pp50-52)
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