A New Electromagnetic Device for the Surveying of Subsurface Conductors
A.E. LEHMBERG
IT IS KNOWN that some ores of sulphide type, such as pyrite, chalcopyrite, ,and bornite have an electrical conductivity comparable to that of metals, and accordingly much higher than the conductivity of any unmineralized rock. This physic;] property has long been used for ,the detection of orebodies of this kind by means of electrical measurements made at the surface of the ground. The present paper will deal with a new electromagnetic instrument for the investigation of subsurface conductors, which has been recently introduced into field practice and has already led to successful results in Canada.
Mots Clés:
100 feet, magnetic field, magnetic permeability, operating temperature, resistive, Conductivity, experiment, Experiments, Spacing, sulphide, Sulphides, Survey, Surveys, Systems, Value
