A geochemical ore-prospecting experiment by extracting Fe-Mn oxides bound in soil samples in the Toudaojing Cu-Au deposit in Xin Barag Right Banner, Inner Mongolia
1. Beijing Institute of Geology for Mineral Resources, Beijing 100012, China 2. Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China 3. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China 4. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 5. Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China
The ore-prospecting effect of the stream sediment survey and the soil geochemistry survey is not ideal in the covered areas of the hilly grassland landscape where the water system is not developed whereas the aeolian sand is very developed. Therefore, it is imperative to carry out some new ore-prospecting experiment for prospecting breakthrough. In this study, the experiment was carried out by using the Fe-Mn oxides bound in the soil samples in a selected experimental site. The Toudaojing Cu-Au deposit in Xin Barag Right Banner of Inner Mongolia was selected as the experimental site. Soil samples were collected in the ore area and its periphery. Element concentrations in the Fe-Mn oxides bound in soil samples were determined by matched analysis of scheme including plasma mass spectrometry, atomic fluorescence spectroscopy and flameless atomic absorption spectrometry. Areal test for this geochemical ore-prospecting technique was carried out for delineating geochemical anomaly. Geochemical anomaly was verified by drilling, and new concealed gold orebodies were found. The results show that accuracy and precision tests of the analytical method could satisfy the requirements of geochemical ore-prospecting. The Fe-Mn oxides bound in soil samples can effectively delineate the prospecting target area and find concealed gold deposits in the Toudaojing Cu-Au deposit in Xin Barag Right Banner of Inner Mongolia. Therefore, it is a successful case of geochemical ore-prospecting in the covered area.
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