Abstract
Mineralogical studies in the Lavrion deposit established the widespread occurrence of silver, gold and bismuth mineral phases. Silver is present in both the Kamariza and Plaka mines in the form of various Bi-Pb-Ag bearing sulfosalts, Ag-bearing tetrahedrite and Ag-sulfosalts included in chalcopyrite and galena. Gold occurs only in the Kamariza mines, in native form closely associated with native bismuth in copper ores and in a newly discovered gersdorffite + bismuthinite + native gold assemblage enclosed in galena. This mineralogy, and especially the close relationship of bismuth and native gold in the ore, is strong evidence of magmatic-hydrothermal inputs in the system. The Lavrion deposit underwent a multistage evolution probably the result of several magmatic pulses and may have affinities to the reduced-type magmatic-hydrothermal systems.
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