The Chiweigou Gold Deposit is located on the Hei-Ji metallogenic belt, the eastern part of the Tianshan-Xingmeng orogenic system, which is a part of the superimposition and transition section between the Paleo-Asian Ocean and Circum-Pacific tectonic domains. Ore bodies in the area are hosted by calcite veins, which intruded in the Early Cretaceous intermediate acidic volcaniclastic rocks. The main carriers of the Au are telluride besides native gold, indicating a mantle source. Its association with commonly seen igneous carbonates such as calcite, quartz, apatite, and magnetite indicates genesis connections; the wall rock alteration is dominated by carbonatization, typical altered mineral assemblage of fenitization can be observed, and obvious alkaline metasomatism took place. The uniform rightward inclination of REE spherical particle normalized distribution patterns indicated evident characteristics of LREE enrichment (w (LREE)/w (HREE)=5.51-9.55) and positive Eu and negative Ce anomalies; trace elements enrich incompatible element (Rb, Sr, Hf),and Sr has an evident positive anomaly. The C,O isotopic tracing indicates that the calcite veins that occurred within the Chiweigou Gold Deposit were derived from mantle magma. Based on these results, together with the predecessors’ studies, the genesis of Chiweigou Au-bearing calcite veins is igneous carbonate magma and the result of a local extensional tectonic environment related to the subduction of the Pacific plate in the Late Mesozoic. When settling in the shallow part of the crust, they mix with precipitation, leading to dropping temperature and pressure and then dealkalization. During the process, gold precipitated and enriched into ores. [ABSTRACT FROM AUTHOR]