Gold Enrichment Patterns and Integrated Deep-Shallow Metallogenic Model of the Liaoshang Gold Deposit, Northeastern Margin of the Jiaolai Basin, China

The Liaoshang gold deposit in the Jiaolai Basin (North China Craton) has had its deep resource potential limited by inadequately understood vertical metallogenic patterns.Using 220 drill holes, 523 stope samples (38879.7 m), and 18,415 Au assays, this study employs implicit 3D modeling to decouple deepshallow mineralization systems.A critical boundary at -400 m is identified: Shallow (<-400 m) NE-striking steep veins (avg.1.2 m thick, Au > 5.5 g/t) are controlled by monzogranite-marble contacts, while deep (-400 m) stratiform orebodies (avg.18.4 m thick, Au = 2.1 0.8 g/t) follow the basin-margin detachment fault.Coefficient of variation analysis (shallow CV = 1.52 vs deep CV = 0.37) reveals a "deep pervasive alteration -shallow boiling enrichment" mechanism.Early-stage fluids formed disseminated mineralization via detachment-zone metasomatism; late-stage boiling at <-400 m triggered rapid gold precipitation into high-grade veins.The resulting 3D targeting model prioritizes silicified zones below -500 m.