Helicopter borne radiometric survey near Kautokeino, Finnmark

Abstract

A helicopterborne geophysical survey was flown by NGU on behalf of Outokumpu Finnmines Oy, over two areas near Kautokeino, Finnmark. The objective of the survey was to locate structures which are favourable for gold mineralization These structures are associated with oxidation of graphite and magnetite, and so are associated with conductivity and magnetic lows. Radiometric data were initially processed to produce a total count map, but then subsequently reprocessed with the intention of producing radioelement and radioelement ratio maps. The intention of the reprocessing was to locate Davidite, a uranium mineral, which is associated with gold in the area. The quality of the data was unfortunately not good enough to produce ratio maps, but three radioelement maps were produced. This report discusses the acquisition and processing requirements necessary to produce radioelement maps, and presents three radioelement maps for each of the two areas flown.