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Introduction Rosia Montana is a former mining area in the Apuseni Mountains (part of the Western Romanian Carpathians), belonging to the Golden Quadrilateral , one of the most important gold-producing areas in Europe. The volcanogenic complex from Rosia Montana is considered as a maar-diatreme structure, mainly consisting of clastic rocks created by successive phases of volcanic activity ( 1 ). The occasional contact between the ascending magma and the shallow aquifers has produced a large pile of phreatomagmatic breccias. Two main dacitic bodies, locally