Ensaios De Polarização Induzida Espectral (Sip) Aplicados À Exploração Mineral De Chumbo E Zinco Nos Corpos Canoas 2 E Canoas 3, Vale Do Ribeira-Pr

The Spectral Induced Polarization method (SIP)<br>involves techniques considered to complement those<br>as resistivity and chargeability methods in traditional<br>induced polarization surveys. The paper discusses the<br>results derived from a line that runs 1,325 m across<br>Canoas 2 and Canoas 3 bodies identified though<br>rotary sounding. Dipole-dipole with a = 50 m was the<br>eletrode array used. The mineralized areas correspond<br>to sulphide concentration (sphalerite, galena, piryte,<br>pirrotyte), with average grades of 3.5% (Zn), 3.2%<br>(Pb) and 63 g/ton (Ag). Inversion of the mean IP<br>values allowed a good subsurface delimitation of the<br>bodies, and the analysis of the spectral parameters<br>(time constant and true chargeability) shows<br>simultaneous elevation of those parameters at depths<br>that correspond to those of the mineralized bodies.