The Bureau of Mineral Resources has commenced a geophysical investigation of the copper-nickel deposits in the Five-Mile district near Zeehan at the request of the Tasmanian Department of Mines, Hobart. The Department, in its Summary Report (1952) has indicated the possibility that further ore-bodies of economic value exist in the area. Therefore, the Bureau was asked to carry out a geophysical investigation of the whole area. The Department of Mines laid out the lines including cutting and pegging the traverses. The geophysical survey was begun in May, 1952, with a programme including self-potential, magnetic and electro-magnetic measurements. This interim report has been prepared to present the geophysical results obtained to date and to discuss their significance. Self-potential and magnetic results are discussed.