Złoto w złożu rud miedzi na monoklinie przedsudeckiej
Abstract
GOLD IN THE COPPER DEPOSITS OF THE FORE-SUDETIC MONOCLINE (SW POLAND)
Summary
A new native gold occurrence is described from the Lubin mining district. The gold occurs over a width up to a few dcm near the top of the Rote Fäule facies where it cuts the Kupferschiefer black shale and the Weissliegend sandstone in the Polkowice-West mine. It occurs as grains up to 0.04 mm in diameter together with hematite and covellite. It was precipitated from upwelling oxidizing fluids during the main period of mineralization at a temperature below 103.5°C. Gold was probably transported as the thiosulphate complex Au(S203)2-3 which attains its maximum concentration under nonequilibrium conditions close to the equilibrium boundary between sulphide and sulphate. As the sulphide/sulphate boundary migrated upwards during mineralization gold was continually dissolved and reprecipitated, finally coming to rest at its present location when fluid circulation ceased.
Summary
A new native gold occurrence is described from the Lubin mining district. The gold occurs over a width up to a few dcm near the top of the Rote Fäule facies where it cuts the Kupferschiefer black shale and the Weissliegend sandstone in the Polkowice-West mine. It occurs as grains up to 0.04 mm in diameter together with hematite and covellite. It was precipitated from upwelling oxidizing fluids during the main period of mineralization at a temperature below 103.5°C. Gold was probably transported as the thiosulphate complex Au(S203)2-3 which attains its maximum concentration under nonequilibrium conditions close to the equilibrium boundary between sulphide and sulphate. As the sulphide/sulphate boundary migrated upwards during mineralization gold was continually dissolved and reprecipitated, finally coming to rest at its present location when fluid circulation ceased.