self-potential method
Quick Summary
The self-potential method is a technique used in electrical prospecting to identify potential ore bodies. It works by measuring the natural electrical voltages, or electromotive forces, that exist in and around an ore body. These natural currents are generated when downward-percolating groundwater oxidizes metallic sulfide minerals, creating a natural battery effect. Current flows through the ore and the surrounding groundwater. By measuring these voltage differences, typically ranging from 50 to 400 millivolts, geophysicists can detect continuous metallic sulfide bodies that are located near the water table. Other phenomena, such as graphite or certain pyritized rocks, can also produce self-potentials.12
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