Discovery of Wolitu Pb-Zn deposit through geochemical prospecting under loess cover in Inner Mongolia,China |
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| Institution: | 1. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China;2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China;3. UNESCO International Centre on Global-Scale Geochemistry, Langfang 065000, Hebei, China;4. Key Laboratory of Geochemical Exploration, Ministry of Land and Resources, China, Langfang 065000, Hebei, China |
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| Abstract: | We report the finding of the Wolitu Pb-Zn deposit in Inner Mongolia, China, through a series of geochemical surveys. The Wolitu area, located in the loess-cover area in the Hure Banner, Tongliao City,Inner Mongolia, and neighboring the Horqin Sandy Land to the north, had no previous history of Pb-Zn mining or record of Pb-Zn mineralization. Our study identified a large Pb-Zn anomaly with potential zones of mineralization by stream sediment survey. Random rock sampling reveals limonitization at sporadic outcrops in the gullies. The high concentrations of Pb in the residual debris provided guidelines to fix the position for exploratory trench. Oxidized concealed orebodies were identified by trenching.Blind orebodies in veins hosted within the structural zone between slates and marbles of the upper Carboniferous Shizuizi Formation and the Permian granite were discovered by drilling. It is computed that the ore reserve may reach up to 540,000 tones with Pb grade of 1.27% and Zn of 1.9%. This case study is an excellent example for identifying potential polymetallic deposits in loess covered terrains using geochemical exploration. |
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| Keywords: | Geochemical exploration Loess-covered area Pb-Zn deposit Resource reserve Inner Mongolia |
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