The power source for AFMAG is distant lightening strikes, of which there are approximately 100 per second around the globe on a continuous basis. The magnetic field generated by these lightening strikes propagates around the world penetrating deep into the earth's crust. AFMAG detects and reads current channeling assisting the understanding of the conductivity and resistivity of the geology it passes through. Minerals have varying, identifiable degrees of conductivity and resistivity. It is this differentiation that allows Exploration Syndicate, Inc. to model and accurately identify large scale geologic features. Depth penetration is achieved through measurements taken at long flight lines and a range of frequencies. Read more about the Arizona AFMAG test.