I have commented in the past that as far as how it actually acts in practice the Minelab GPZ 7000 reminds me more of a "super VLF" than a PI detector. I want to carry that analogy a bit father in an attempt to help clear up a common question about the detector. What Gold Mode should you use? Minelab makes a unique prospecting VLF called the Eureka Gold. What makes it unique is that is can be switched between three frequencies - 60 kHz, 20 kHz, and 6.4 kHz. The high frequency 60 kHz mode is the