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Low frequency communication from a trapped miner is idealized as the electromagnetic boundary value problem of two-layered anisotropic earth energized by a buried vertical electric dipole. The shale beds form the anisotropic cover for the coal swamp. Using numerical integration techniques the field structure has been investigated on the air-earth interface. Analysis reveals that conductivity-anisotropy modified the electromagnetic fields quite significantly and needs to be taken into account for the precise location of the source in emergency situations.