The Tumannoye gold project comprises approximately 19km2. The host rocks are Triassic sediments and Cretaceous granodiorites, dikes of earlier-cretaceous lamprophyres, granite-porphyries, late-cretaceous granite-porphyries, diorite-porphyrite, andesites, basalts and trachydolerites. The structures containing the gold-sulfidic mineralization are related to brecciation, collapse features and metasomatic alteration zones. The gold mineralization occurs in two forms -- tabular deposits of interspersed pyrite-arsenopyrite in metasomatically altered terrigenous-carbonaceous bodies and, to a lesser extent, as arsenopyrite-quartz stringers in mineralized dikes of granite porphyry.
