Application of three-dimensional weights of evidence in modeling concealed ore deposits: Case study of a porphyry Cu deposit in the Urmia-Dokhtar magmatic belt of Iran Ehsan Farahbakhsh 1,* , Ardeshir Hezarkhani 1 , Taymour Eslamkish 1 , Abbas Bahroudi 2 , Rohitash Chandra 3,4 424, Hafez Ave., Tehran, Iran Abstract Given the challenges in data acquisition and modeling at the stage of detailed exploration, developing a prospectivity model particularly for disseminated ore deposits is difficult. Recent work has shown that the weights of evidence- based modeling has good potential for discovering of such deposits. In our ap- proach, the qualitative geological and quantitative geochemical data obtained from boreholes are used to create a three-dimensional prospectivity model of a porphyry Cu deposit within the Urmia-Dokhtar magmatic arc, Iran. This prospectivity model is created using the weights of evidence method which is further extended for a three-dimensional (3D) space. We demonstrate that * Corresponding author Email address: e.farahbakhsh@aut.ac.ir (Ehsan Farahbakhsh) 1 Department of Mining and Metallurgical Engineering, Amirkabir University of Tech- nology (Tehran Polytechnic), Tehran, Iran 2 School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran 3 EarthByte Group, School of Geosciences, University of Sydney, Sydney, Australia 4 Centre for Translational Data Science, University of Sydney, Sydney, Australia Preprint submitted to Ore Geology Reviews October 21, 2019 arXiv:1910.08162v1 [stat.AP] 16 Oct 2019