Scientific publications

The Pedrolampi deposit is restricted to a zone of intersection of near-N-S (Archean) and NW-trending (Proterozoic) shearzones. Rocks that host gold mineralization are mylonitized and listwanitized green schists after mafic tuffs and carbonatechlorite-
sericite schists after graywackes, sandstones and polymictic conglomerates of the upper part of the Lopian unit, correlatable with the top portion of the Koikary structure and pull-apart basin sediments. The mineralization is represented by two generations: 1) coarse cubic pyrite and native gold associated with early N-S-trending quartz veins and 2) chalcopyrite, gold, electrum, silver, scarce sulphides and sulphosalts associated with tourmaline-carbonate-chlorite-sericite metasomatic rocks and late NW-trending quartz veins. The temperature of formation of both types of quartz veins decreased from 390–400 to 240 ºC and lower values in generation II. Near-N-S foliation and metasomatic alteration zones in the Elmus area of the Segozero-Vedlozero greenstone belt host the West and East Orekhozero and Talpus occurrences. Occurrences of the Elmus are associated with felsic porphyry dykes and alteration zones in their aureole, and the Talpus occurrence is associated with pyrite ore.