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Prediction of hidden Au and cu-ni ores from depleted mines in Northwestern China:four case studies of integrated geological and geophysical investigations

Prediction of hidden Au and Cu-Ni ores from depleted mines i...

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中国科学院地质与地球物理研究所2008学术年会

作者： Ping Shen·Yuanchao Shen·Tiebing Liu·Guangming Li·Qingdong Zeng Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences, P.O.Box 9825,Beijing 100029,People’s Republic of China

Integrated geological and geophysical investigations were carried out in 26 active mines in Northwestern China during the period 2001-2006 to explore for hidden extensions of known ore bodies and to search for new *** paper presents four case studies from northwest China:the Kuoerzhenkuoa volcanogenic hydro-thermal gold deposit,the Nanjinshan breccia-associated gold deposit,the Duolanasayi deposit,associated with a ductile-shear zone,and the hulu magmatic cu-ni sulfide *** these studies,detailed mine-scale geological studies were carried out to determine the location and controls on ore *** on these investigations and a review of previous exploration data,genetic models for the deposits were evaluated,and specific new targets were *** target areas were tested with surface geophysical surveys using the Stratagem EH4 system,a hybrid-source magnetotellurics(MT) *** of the data obtained in the surveys identified geophysical target anomalies that were subsequently *** of these test holes demonstrate the presence of Au and cu-ni *** of the geological models was crucial in developing conceptual targets as a basis for surface geophysical *** models established the most likely target areas where Au and cu-ni mineralization could occur,but they did not define the limits or the geometries of the mineralized *** MT surveys played an important role in defining the location of buried mineralized systems and in testing the validity of the conceptual *** resistivity cross-sections obtained by imaging the MT data established the boundaries and geometries of the host rocks,including the distribution of lithology,structures,alteration,and *** four case studies in this paper show how this integrated geological and geophysical approach was used successfully to discover hidden mineral deposits.

关键词： Prediction of hidden ore bodies Hybrid magnetotelluric Kuoerzhenkuola gold deposit Nanjinshan gold deposit Duolanasayi gold deposit hulu cu-ni deposit

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