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Abstract
Several ore-bearing boulders in moraines in the Skellefte district, northern Sweden, have been examined to test possible petrological and geochemical indications of source. Since the mineralogy of the various ores is similar, it is difficult to decide by the evidence of microscopy alone whether a boulder originates from some known mineralization. Additional information is needed. The mercury content of sulfides shows a regular trend on both local and regional scale in the Skellefte district. For this reason sulfide concentrates from thirteen ore boulders were analyzed for Hg, Zn and Cu. The ratio Hg/Zn in sphalerite and Hga/Cu in chalcopyrite as well as the amount of mercury in pyrite appear to serve well as fingerprints of the boulders.