Aplicação Do Método Da Polarização Induzida Espectral (Sip) Na Descoberta Do Depósito Breves, Província Mineral De Carajás-Pa

The spectral induced polarization – SIP designate a<br>variety of methods which look beyond the familiar<br>resistivity and chargeability as measured in induced<br>polarization surveys, that analysis electrical survey<br>data at a number of frequencies or delay times. A set<br>of quantities which characterize the information<br>gained. The Cole-Cole impedance model is adopted<br>for the study of the spectral IP effect’s on timedomain<br>measurements. The spectral induced<br>polarization applied to near Igarapé Bahia gold mine<br>exploration, makes possible, the detailed analysis of<br>areas, pre-selected by induced polarization surveys,<br>using gradient array. It has been useful for modeling<br>and understanding chargeability anomalies in Breves<br>deposit. Enable us to identify different types of<br>anomalies, distinguishing disseminated sulfide<br>concentrations related anomalies, from those related<br>to membrane polarization effect, related to rocks<br>composed dominantly by clay minerals, with<br>carbonaceous material and manganese. The<br>contribution of spectral induced polarization survey,<br>carried out by CVRD and LPGA, comprises drilling<br>optimization and exploration costs reduction. This<br>paper presents as results, the characterization of<br>Breves deposit. Cole-Cole analysis parameters<br>signature, characterized by disseminated sulfide<br>concentrations related to medium chargeability (m)<br>and Tau (t) values, while high chargeability (m) and<br>Tau (t) values, are relate to rocks with high contents<br>of clay minerals, with manganese and carbonaceous material.