Comparative Study of Copper-Nickel Deposit Exploration by the Geoelectro-chemical Extraction Method in Different Overburden Areas

We have made a comparative study of quantitative and qualitative analysis and application of the geoelectro-chemical extraction method in different overburden areas in southward extension of Jinchuan in Gansu province and Hongqiling in Jilin province. We found that this method extracted very few ions in arid areas covered with debris,but the prospecting effect was almost the same as that in moist areas covered with thick overburden. And this method could show objectively differences of geochemical characters and original differences produced by mineralization. The comparative study discovered that this method can strengthen the anomalies,and enlarge prospecting effect to a certain extent. In addition we delineated several nickel and copper anomaly zones in these two areas. Therefore the geoelectro chemical extraction method can achieve unexpected prospecting effect compared with other detection methods in areas with weak anomalies of primary halo and secondary halo.