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| | Abstract | | The induced polarization (IP) method is used in many cases of exploration for nonferrous metal ore deposits such as porphyry copper and iron-oxide-hosted copper-gold deposits. This is because sulfide minerals such as pyrite and chalcopyrite have the IP effect. However, it is difficult for the present condition to identify valuable sulfide minerals such as chalcopyrite, because many of measured IP anomalies are often caused by pyrite and magnetite minerals which have economically low value. One of the methods used to identify the kind of minerals is the spectral IP (SIP) method, which measures complex resistivity at many frequencies. To evaluate the effectiveness of the SIP method, we measured the complex resistivity of artificial samples that contained various sulfide mineral particles. Then, we tried to analyze the complex resistivity data using Cole-Cole models. The results show that the chargeability of most of the samples become larger as the content of particles is increased, and the time constant and Cole-Cole exponent differ with the samples. This indicates that the subsurface sulfide minerals can be identified using the SIP method. |
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