The Mokrsko Gold Deposit—the Largest Gold Deposit in the Bohemian Massif, Czechoslovakia
P. MorÁvek, J. Janatka, J. PertoldovÁ, E. Straka, J. ĎuriŠovÁ, M. PudilovÁ, 1989. "The Mokrsko Gold Deposit—the Largest Gold Deposit in the Bohemian Massif, Czechoslovakia", The Geology of Gold Deposits: The Perspective in 1988, Reid R. Keays, W. R. H. Ramsay, David I. Groves
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The recently discovered Mokrsko deposit represents the largest gold deposit in the Bohemian massif. The deposit occurs in upper Proterozoic volcano-sedimentary rocks of the Jilove belt (640-700? Ma) and in granodiorite of Hercynian age (320-360 Ma). Gold-bearing quartz mineralization of vein and stockwork types is structurally and lithologically controlled. The lack of wall-rock alteration and the similar chemistry of amphibole and biotite from quartz veins and adjacent rocks suggest similar P-T conditions of origin. The temperature ranges obtained for the quartz veins (fluid inclusions: 250°-350°C; oxygen isotopes: 330°-420°C) and the temperatures and pressure of the adjacent rocks (500°-630°C); P<0.4 GPa) indicate that the gold mineralization occurred in the same temperature ranges as epidote-amphibolite and lower amphibolite facies metamorphism. The rock geochemistry suggests a hydrothermal metamorphic mobilization of gold from upper Proterozoic rocks with a possible enrichment by magmatic fluids.