The application of drillhole magnetometry and mise-a-la-masse in the exploration for nickel sulphides, Finland ? discovery of the Telkkälä orebody

Abstract

During the 1980s Outokumpu Exploration carried out several exploration programs for nickel sulphides in eastern Finland. Geophysical methods have been significant both in locating nickel bearing intrusives hosted by mica gneiss and in detailed downhole investigations of the dimensions of the ore zones. In-hole 3-component magnetic and mise-a-la-masse measurements contributed to the discovery of a small but high grade orebody beneath a worked out shallow deposit at Telkkälä, southeastern Finland. The high contrast in magnetization and conductivity between the ore mineralization and the host gneisses provides a favourable situation for quantitative interpretation of the geophysical data.