Petropavlovskoe lode gold deposit, the Polar Urals: geological and structural features of veinlet-disseminated gold-sulphide mineralization

The paper deals with geological and structural features, hydrothermal alteration, ore types of the Petropavlovskoe gold deposit located in the North of the Smaller Urals volcano-plutonic belt being the part of the Middle Paleozoic island arc system of the Polar Urals. The ore-controlling role of porphyry diorite bodies of the latest phase of intrusion has been detected. There are two ore types: gold-sulphide (main for the deposit) and gold-enriched gold-low-sulphide-quartz. The morphology and parameters of the gold-bearing mineralized zones and ore bodies are characterized. The Petropavlovskoe deposit can referred to the gold-porphyry type on the base of its structural and morphological, mineralogical and geochemical features. Such specific features include: spatial association of gold mineralization with the bodies of porphyry intrusive phases; stockwork structure of gold-bearing zones; volumetric character of ore-alteration zoning and ore component distribution.