Cover Story：Photograph illustrating the “burnt-skin” surface feature at the Xiananggou deposit, Baiyu County, Sichuan Province. In recent years, the newly discovered Xiananggou Pb-Zn-Cu (Ag-Au) de-posit, located in the northern segment of the Yidun arc, has been identified as an intermedi-ate-sulfidation epithermal deposit. The spatial distribution of ore bodies is strongly influenced by volcanic edifices. The deposit hosts large-scale Pb-Zn resources and medi-um-scale Cu, Au, and Ag resources, indicating substantial potential for further exploration. The discovery of this deposit, together with clarifica-tion of its deposit type, has overturned the long-held conventional view that the northern segment of the Yidun magmatic arc predomi-nantly hosts “Xiachu-type” VMS deposits. In-stead, the findings demonstrate that Late Triassic volcanic terrains in this region possess signifi-cant potential to host “Pulang-type” porphyry-epithermal mineralization systems, thereby, opening an entirely new direction for regional mineral exploration across the northern Yidun magmatic arc. The “burnt-skin” iron-oxide staining anomaly developed at the Xiananggou deposit represents a classic surface exploration indicator of porphyry mineralization. For further details, see pp. 235-248 of this issue. (Photo by RAN Fengqin).