The Jinshan gold deposit consists of gold-bearing ultramylonite and gold-bearing quartz vein ores. The Rb-Sr isochron age of fluid inclusions in quartz from quartz veins is the same as that of the gold-bearing ultramylonite, suggesting that both the types of orebodies were formed simultaneously in the Caledonian period, in the range 406–409 Ma. REE patterns and sulfur, lead, carbon, hydrogen and oxygen isotope data, as well as the composition of fluid inclusions, have shown that the ore-forming fluids were derived from formation water, and the ore-forming materials came from the gold-hosted rocks. The Jinshan gold deposit occurring in a Caledonian brittle-ductile zone in metamorphosed microclastic rocks owes its origin to Caledonian reworking processes.