Map Asia 2003 Natural Resource Management Map Asia Conference 2003 ©GI Sdevelopment.net, All rights reserved. Integration and analysis of airborne geophysics and remote sensing data for exploration of porphyry copper deposits in the Central Iranian Volcanic Belt H. Ranjbar 1 , M. Honarmand 2 , Z. Moezifar 2 1 Department of Mining Engineering, Shahid Bahonar University of Kerman, Iran. Post box No. 76135-133, Tel and fax: +98-341-2112764, E-mail: h.ranjbar@mail.uk.ac.ir 2 Department of Geology, Shahid Bahonar University of Kerman, Iran. Post box No. 76135-133 ABSTRACT The area under study covers an area of 640 km 2 , located in the southern part of Iranian Volcanic- Sedimentary Belt. ETM+ images have been used for alteration mapping. Satellit images can be used for enhancing the areas with hydroxyl and iron oxide minerals. However field checking has shown that this method is not able to enhance all the areas with hydrothermal alteration. At the same time many of the altered areas do not have good signature in the geophysical data. In order to recognize such areas integration of remote sensing and geophysical data can be helpful. The Darrehzar Cu deposit is chosen as a control area. The data analysis and integration of geophysical and remote sensing data is performed by using directed principal components. This technique is found to be useful for the delineation of hydrothermaly altered areas with more confidence. Key words: Data integration, principal components, ETM+, porphyry exploration, raster GIS, Iran 1. INTRODUCTION: Many of the known porphyry Cu deposits are situated in the Central Iranian Volcanic Belt(Figure 1). This belt has a great potential as far as Tertiary porphyry copper mineralization is concerned. Given the poor soil development, relatively poor vegetation cover but abundant outcrops the arid/semiarid part of the belt is suitable for airborne geophysical survey and remote sensing studies. Two airborne geophysical surveys were done over the study area. The first airborne geophysical survey (radiometry and magnetometry) over the area was done in 1977 by Prakla-Seismos GMBH on behalf of Atomic Energy Organization of Iran(AEOI). The aim of this survey was exploration for uranium and thorium minerals. The flight line spacing was chosen at 500 meters and nominal terrain clearance was 120 meters. In the second survey a helicopter magnetic/electromagnetic/radiometric survey (HMER) was flown by Geonex Aerodat Incorporated over an area of 7000 km 2 , in Kerman Province(in 1992). The aim of the project was mainly for exploration of porphyry and vein-type mineralization in the Kerman region. The survey was conducted over the area in 200 meters flight spacing and constant height at average elevation of 60 meters for spectrometer, 45 meters for magnetometer and 30 meters for electromagnetic coils. The data then, was processed by various filtering and enhancement techniques for noise removal and