Abstract
Described of structure, mineralogy and age of ore and hosted rocks of the recently explored Nizhniy Birkachan Au-Ag epithermal deposit. The orebodies is a quartz-carbonate-adularia veins and veining zones, that hosted porphyry granodiorites with U-Pb age (ID-TIMS) 335 ± 2 Ma. The ore contain low sulfides, low Ag grades. Main ore minerals – pyrite. Silver minerals represented by tennantite-tetraedrite, Ag sulfide, native Au and Ag, gessite, The 40Ar/39Ar age of adularia from vein 169 ± 4 Ma. This young age we explain by rejuvenation of isotope system after intrusion of non-mineralizied Jurassic mafic dykes. The main features of Nizhniy Birkachan Au-Ag epithermal deposit similar with other Au-Ag deposits of Kedon magmatic belt of the Omolon massif. All that was formed in 290–335 Ma age interval.
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