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Abstract
The sillimanite bearing quartzite occurring at Enåsen has been found to carry high amounts of gold together with Bi, Sb, Tc and Se. Cation distribution between Fe-Mg silicates in the regionally metamorphosed country rocks (gneisses) yields temperatures of 600–700°C and pressures of 4–6 kb with an estimated XH2O = 0.5. The temperatures indicated by the arsenopyrite geothermometer, 385–435°C, are assumed to show retrograde equilibrium conditions. The present study shows the gold to occur in two different modes, as elementary gold associated with sulphides and as elementary gold and gold-antimony tellurides together with complex graphic intergrowths of tellurides and sulphides. The presence of Te, Bi, Sb, Se and abundant rutile and topaz suggests that hydrothermal activities provided for the original deposition of ore minerals.