Hongling Pb–Zn Polymetallic Deposit, Bairin Left Banner (Balin Zuoqi), Chifeng City (Ulanhad League; Chifeng Prefecture), Inner Mongolia, Chinai

Regional Level Types
Hongling Pb–Zn Polymetallic Deposit	Deposit
Bairin Left Banner (Balin Zuoqi)	County
Chifeng City (Ulanhad League; Chifeng Prefecture)	Prefecture-level City
Inner Mongolia	Autonomous Region
China	Country

In the Huanggang–Ganzhuermiao tin and silver polymetallic metallogenic belt in the eastern part of the Central Asian Orogenic Belt. Pb–Zn skarn comprises an important part of this belt, with a total resource of 0.29 million metric tons (Mt) Zn at an average grade of 4.24%, 0.15 Mt Pb at an average grade of 2.25%, and 2.91 Mt Fe at an average grade of 28.7%, accompanied by less important Sn, Cu, Bi, and Au.

The Hongling deposit contains 0.29 Mt Zn (4.24 % Zn), 0.15 Mt Pb (2.25 % Pb), and 2.91 Mt Fe (28.7 % Fe), with subordinate Cu and Ag and minor newly discovered Mo and Sn. The Hongling deposit is associated with the early Cretaceous granitoids (including porphyritic and coarse-grained granitoids) intruded into limestone/slate of the late Permian Dashizhai Formation, which formed an approximately 900 m deep and approximately 800 m long steeply dipping skarn zone. The spatial distribution of the skarn minerals and metal present clear zoning at the contact zone between the HLPG and the carbonate of the Dashizhai Formation with (1) a garnet belt near the HLPG, an intermediate pyroxene belt, and a distal wollastonite ± siderite belt and with (2) Fe mineralization near the HLPG, intermediate chalcopyrite mineralization, and a distal Pb–Zn mineralization. The Hongling ore bodies vary from approximately 350 m to approximately 1400 m in length and from approximately 1 m to approximately 100 m in thickness and mainly strike northeast). These ore bodies are numbered by their mineralization types: No. I Fe–Sn ore body, No. II Cu–Zn ore body, No. III Zn–Ag ore body, No. IV Pb–Ag ore body, and No. V Pb–Zn–Cu ore body). The main ore structures are mainly veins, vein stockworks, and massive structures with emulsion, subhedral, and cross-shaped textures). Four mineralogy and alteration paragenesis stages have been identified: (1) garnet–pyroxene stage, (2) amphibole–epidote–quartz stage with magnetite mineralization, (3) chlorite–quartz–calcite stage with sphalerite–galena–chalcopyrite–pyrite mineralization, and (4) calcite stage.

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References