Propagation of radio waves in ferriferous rocks and ores

Conclusions

• 1. In magnetic ores with ρ_e=1 Ω·m, despite the marked attenuation, in practice it is possible to achieve a range of 30–35 m at frequencies below 0.15 MHz with a transmitter power of 20–25 W and a receiver sensitivity of 0.5–1 μV/m.

• 2. In rocks and ores with ρ_e=1 Ω·m or more with the same equipment it is possible to achieve ranges of over 70–100 m.

• 3. In magnetic rocks and ores with ρ_e=1 Ω·m or more, b is almost independent of the magnetic susceptibility. An appreciable dependence of b on the magnetic susceptibility is observed only in magnetite ores with ρ_e=1 Ω·m.

• 4. In low-resistance rocks and ores of the Krivoi Rog deposit, in practice it is inadvisable to use frequencies above 1.0 MHz, owing to the high value of b, which rapidly rises with the frequency.