Based on a detailed analysis of geological characteristics and a study of hydrogen, oxygen, sulfur, and lead isotopes in hydrothermal minerals, this paper has discussed the origin of ore-forming fluid and materials and genesis of the Budunhua deposit.Hydrogen and oxygen isotope analyses indicate that the ore-forming fluid in the early ore-forming stage in Jinjiling and Kongqueshan ore blocks was mainly magmatic water, whereas that in the late ore-forming stage was probably a mixed fluid of magmatic and meteoric water. With the regional geological evolution history of the middle-south part of the Da Hinggan Mountains as a premise, the mineralization of the Jinjiling and the Kongqueshan Cu ore blocks in the Budunhua Cu deposit should be mainly related to fluid mixing which led to the precipitation of metal sulfides.
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