Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield

The Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits in the western segment of Russian Arctic Kolmozero–Voronya greenstone belt are considered two parts an Archean (2.83–2.82 Ga) porphyry-epithermal system, probably oldest one defined Fennoscandian Shield. Formation deposit at epithermal stage system is indicated by spatial genetic relationships with sills granite porphyry, geochemical association ore elements (Au, Ag, Cu, Pb, Sb, As), Au/Ag ratio <0.2, multiplicity silver mineralization different Sb sulfosalts. geological–structural characteristics Pellapahk, i.e., their location a shear zone, morphology size bodies, scale deposits, intensity zoning rock alteration, do not oppose this model. Mineralized rocks were amphibolite metamorphosed Neoarchean again Paleoproterozoic. Structures sulfide melt crystallization formed ores during metamorphism, those fine intergrowths galena, argentotetrahedrite, pyrargyrite, pyrrhotite, ullmannite, stutzite, other mineral phases low-melting-point metals such as As, Bi.