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Offline KellycoDetectorsTopic starter
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« on: March 31, 2021, 10:38:37 am »
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There are many misconceptions and uncertainties when it comes to gold hunting. Gold expert and Executive Director of Development for GPAA, Kevin Hoagland, sat down with us briefly to give us a deep dive into the world of gold prospecting. The following tips are based on his knowledge and experience, and of course his success with finding gold.

VLF Metal Detector vs. PI Metal Detector

VLF (Very Low Frequency) Metal Detector

A VLF metal detector is a single or multi-frequency machine metal detecting in a farm field with a shovelthat consists of a continuous sine wave. The sine wave(s) goes down and into the ground to find a metallic target, and once it does, the machine charges the target releases an eddy current, and sends a signal back.

A common misconception for these machines is that you cannot get depth out of a VLF metal detector. That is not true, as long as a VLF machine is properly set up and you are using the right detector in the right conditions with the right coil, you can absolutely get depth with this machine. Yes, a VLF detector can have an advantage on shallow very very small targets, on and off of bedrock. As long as you can keep it stabilized, ground balanced, and the sensitivity is set properly, this can help you find some of the smallest gold pieces, many in the grain over gram range.

PI (Pulse Induction) Metal Detector

I guess that my best and easiest description of PI metal detectors is a machine that talks and then listens. Unlike the VLF detector, a PI machine is not a continuous sine wave it is a pulse, on-off, on-off. These machines will do better than VLF in most highly mineralized soils because itís measuring

the speed of the signal decay of the target and the ground around the target. However, there are places like low mineralization deposit areas where your PI machine will simply just not work to its fullest potential and in these places, you are better off with a VLF machine, and vice versa. For example, if you have excessive cold or hot rocks and or weird salts, there have been times when a VLF detector has been outperformed by a PI machine.

How Does Frequency Work in a VLF Metal Detector?

The higher the frequency, the closer to the surface the machine works to find smaller targets. The lower the frequency, the deeper in the ground the machine will go to find larger and more conductive targets. Itís not the case that one machine or frequency works better than another, it depends on the conditions and the ground that youíre detecting, coil size, and your tuning. Frankly, for me when I head out detecting, I have a VLF and PI with me and I do recommend that you carry both types of machines, if you can, to be prepared for all of the varied conditions and the ground to change and to get the best results.

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The Complete Guide to Gold Prospecting
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