A Preliminary Study of Reserve Estimate and Resource Potential Assessment of Critical Elements in the Jiaodong Gold Deposits, China

Through analysis of critical element content in fine gold mine and tailing sands of the two super-large gold deposits of Dayingezhuang and Xiadian, it is found that relative to abundance of elements in crust of the North China Craton, rare and precious elements Co, Rh, Ir and Ru, scattered elements Cd, Te and Se, and rare elements W and In have all been enriched to different degrees; Especially, extreme enrichment of Te, Co and Cd has reached the comprehensive evaluation grade of associated components. According to comprehensive evaluation specifications of associated useful components and relevant parameters of gold beneficiation report, the available critical metal reserves in gold ores and fine gold mines were estimated respectively. The Te reserves in the Xiadian gold deposit are 69 tons (52 tons in fine gold mine) , Co reserves are 604 tons (413 tons in the fine gold mine) , and the Cd reserves in the Dayingezhuang gold deposit are 224 tons (206 tons in the fine gold mine) , all of which can be directly recycled. Mineralogy and geochemistry studies show that Te mainly exists as independent minerals such as gold telluride, silver telluride, bismuth telluride, lead telluride and Chenguoda mineral, and they are closely associated with visible gold; Co is often distributed in the form of trace elements in the coarse-grained pyrite in the early stage of the gold mineralization; Cd mainly occurs in the sphalerite, pyrite and chalcopyrite in the late stage of gold mineralization in the form of isomorphism. Furthermore, by comparing the Te and Co content of pyrite in situ and/ or single minerals in typical gold deposits, combined with the elemental composition of Co and Cd in the ore and its regional geochemical spatial distribution characteristics, the extreme enrichment characteristics are comprehensively restricted. The Xincheng, Linglong and Sizhuang gold deposits and the Qixia anomaly area have about 2329 tons, 1035 tons, 1553 tons, and 22790 tons of Co potential resources, respectively, and the Rushan, Xincheng and Jiaojia gold deposits have about 1529, 126, and 216 tons of Te resources, the Cangshang, Xinli, Sanshandao, Sizhuang and Xincheng gold deposits, and the Qixia and northern Zhaoping anomaly areas are about 47.6 tons, 78 tons, 63. 7 tons, 69 tons, 3564 tons, 7120 tons and 696 tons of Cd resources, respectively; that is, the Jiaodong gold mining area has the Co, Te, and Cd resource conditions that are comprehensively utilized in the near future or as potential replacement resources in the future, and its spread area is wide and the resource potential is huge. Preliminary studies have shown that Jiaodon g has the resource conditions for the formation of super-large Cd deposits, large-scale Te and Co deposits, but the spatial distribution of critical metal resources is extremely uneven, and its extreme enrichment mechanism and law are still unclear, and in-depth research is urgently needed.