Located in western Bangong Co-Nujiang River metallogenic belt, the Gaerqiong Cu-Au deposit is a skarn (porphyry) deposit whose exploration has achieved significant breakthrough in recent years. The skarns in the Gaerqiong ore district are typical calcareous skarn, and the skarn minerals include mainly garnet, pyroxene, wollastonite, epidote, chlorite, idocrase, and sillimanite. Electron microprobe analyses suggest that garnet comprises mainly andradite and grossular, pyroxene is mainly composed of diopside, and chlorite includes ferrichlorite and ferromanganese chlorite. The compositional section of garnet shows that mineral components vary with the change of garnet ring, suggesting that the skarns in the mining area were not formed in a completely closed equilibrium environment and the hydrothermal fluids had the multi-stage feature in the formation process of the deposit. The skarns in the Gaerqiong deposit have developed good zonation, characterized by zoning of garnet-diopside phase→diopside-wollastonite phase→wollastonite-epidote-chlorite phase, accompanied by some mineralization combinations from the depth of the rock mass to the shallow part near the surrounding rocks. According to the result of Fe²⁺/Fe³⁺ calculating ratios, the Gaerqiong deposit was formed in a relatively oxidizing environment, and the calculations of Mn/Fe ratios show that the Gaerqiong ore district has certain potential in search for molybdenum ore bodies.