SELF POTENTIAL ANOMALY OVER A SULFIDE CONDUCTOR TESTED FOR USE AS IT CURRENT SOURCE

A minus 420 mV self potential anomaly over a sulphide deposit was test ed as current source. Two lead electrodes were dug into the ground, on e at the place where the negative peak value was found and the other o ne in a nearby bog. The electrodes were connected through variable loa d resistances ranging from 1 M Omega to 1 Omega and the voltage drop o ver the resistances was measured. The current strength through each lo ad resistance which was applied was then calculated. The electrode gro undings were then salted with sodium chloride and measurements followi ng the same procedure were repeated after 3 days. The electrodes were then short-circuited for 4 days and the same type of measurements were then carried out. It is concluded that the SP voltage over the two el ectrodes behaves like an ordinary battery source. A maximum power of 1 30 mu W could be extracted with a voltage drop of 175 mV over a load r esistance of 250 Omega.