Abstract
The Balei epithermal vein gold-quartz deposit is located in the Lower Cretaceous sedimentary sequence. The detailed geological and hydrogeological study of the deposit allowed us to reconstruct the paleohydrogeological conditions of the ore formation. This was particularly promoted by the preservation of the initial geological and hydrogeological structure—a graben-like depression hosting a subsurface water basin. The ore field was formed due to the Early Cretaceous high-temperature hydrothermal activity. The ore-bearing solutions originated via the interaction of the deep fluids with rocks and local subsurface waters. The solutions boiled at the depth of ∼600 m and gold was deposited from the degassed liquid phase.
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