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This paper describes the methodology and analysis of the regional prospectivity of hydrothermal nickel in the Outokumpu Mineral District.This forms a case study which is part of the Developing Mining Camp Exploration Concepts and Technologies - Brownfield Exploration project that focused on developing deep exploration concepts and technologies for Outokumpu-type metal deposits in crystalline bedrock areas. Although the focus in future metal exploration and mining is gradually concentrated in greater depths, the key to understanding deep ore potential is still grounded on a good understanding of the geology of the Earth's surface. Evolving mineral deposit concepts, good geophysical and geochemical data coverage and modern GIS modelling tools enable us to identify and evaluate regional geological characteristics and the related metal potential of brownfield areas. In this semi-quantitative study, pseudo-lithological features of the Outokumpu Mineral District were mapped from airborne electromagnetic and magnetic data using GIS technology and tools. Geochemical data were also used to delineate the regional to target scale prospective areas for followup exploration of Outokumpu-type hydrothermal nickel deposits using GIS fuzzy modelling techniques. [ABSTRACT FROM AUTHOR]