E. N. Afanaseva, Yu. B. Mironov, A. A. Petrova, A. V. Kozlov

Gold-Uranium mineralization in the Baltic Shield

Abstract. The authors provide information on the structural and material features, as well as the main types of uranium and gold-uranium mineralization of the Baltic Shield. The paper specifies the geological composition, informs about the criteria and signs of mineralization, characterizes well-known gold-uranium objects, and assesses the predicted resources. The focus is on characteristics of hydrothermal-metasomatic transformations of the Ozerny site rocks in the Kuolajarvi ore cluster, their manifestation sequence, as well as the ore mineralization formation stages, composition of gold, uranium, and sulfide mineralization. There are data on the content of gold and elements of gold satellites in the ore-bearing zones of the Ozernoye and Lagernoye ore occurrences. The comparative analysis covers spatiotemporal patterns of the gold-uranium ore objects distribution in the Russian (Ozernoye, Lagernoye, Alim-Kursujarvi ore occurrences) and foreign parts of the Baltic Shield (Juomasuo, Konttiaho, Rompas deposits). This highly evaluates prospects of the Kuolajarvi ore cluster for identifying gold-uranium deposits. The data on the age of the ore-hosting metasomatic rocks and uranium mineralization of the Ozernoye occurrence evidence the multi-stage formation of the ore mineralization. It is recommended to continue studying the Early Proterozoic structures in order to identify the scale of gold-uranium mineralization and create an ore-genetic model of its formation.

Keywords: Baltic Shield, gold, uranium, occurrences of the Rompas Group, Kuola-Panajarvi trough