1成矿地质背景东际金(银)矿床是闽北地区罕见的中型以上金矿床,其位于闽西北隆起带东缘,政和-大埔深断裂北端东侧,东坑火山盆地西缘,成因类型为次火山热液型(刘永发,2010)。受控于流纹斑岩的内部构造,矿化强度与硅化、黄铁矿化、绢云母化以及构造破碎强度密切相关。矿石主要有角砾状构造、致密块状构造、细脉-细网脉状构造以及浸染状构造等类型(图1),金属矿物以黄铁矿为主,少量毒 1 Mineralization Geological Background The Dongji gold (silver) deposit is a rare medium-sized gold deposit in northern Fujian Province. It is located on the eastern margin of the Minxi uplift, east of the north end of the Zhenghe-Dabudian fault, on the western margin of the Dongkeng volcanic basin, The type is subvolcanic hydrothermal (Liu Yongfa, 2010). Controlled by the internal structure of the rhyolite porphyry, mineralization strength is closely related to silicification, pyritization, sericitization and tectonic crushing strength. Ore mainly brecciated structure, dense block structure, fine vein - fine vein vein structure and disseminated structure type (Figure 1), mainly pyrite metal minerals, a small amount of poison