Nokta detectors Fors Gold User Manual

Page 28

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In discrimination modes, positive hot rocks will give a typical metal sound again. Negative

hot rocks will not give any sound in these modes (except for occasional false signals).

Therefore, while searching in the field, you can decide by listening to the warning tones

emitted by the device. If you get a metal tone, it means that you have either detected a

metal or a positive hot rock. If you get a strong signal and a stable ID, you can determine

whether it is a hot rock or a metal by looking at the ID. Please keep in mind though weaker

signals tend to give different IDs and metals under rocks may produce different metal

signals. Consequently, digging up a target signal is the best option.

Because you can encounter such a situation in gold prospecting areas where nuggets are

being searched for, it is important for you to get familiar with the hot rocks and their IDs in

your search field and pre-test the device with some nuggets.

If you are using the discrimination modes and know the IDs of the hot rocks around you, you

can use ID masking to eliminate these rocks. However, this may not be sufficient to avoid all

rock signals. The device may still receive signals from rocks because soil and hot rocks

together will form a combined effect and generate a different ID than those of rocks.

When the ground tracking is active, the device may give a warning tone and ID when it

passes over a hot rock because the effect of the hot rock will be different than the

ground's. If you sweep the search coil over the rock, ground tracking will automatically

adjust the setting and the warning tone/ID will either disappear or diminish significantly.

Because there is a slight delay in ground tracking, you may hear a strong signal at the first

one or two sweeps until the setting is adjusted. Then the sound will get weaker and

disappear. This will not happen with metal targets because metals will prevent the device

from ground balancing. Therefore, in ground tracking, if you are getting a constant signal

over a target after repeated sweeps, there is a high possibility that the target is a metal.

Moving from over a hot rock back to soil, the device may give signals to the ground for a

few sweeps until the ground balance setting is updated again. This is normal and should

not mislead you.

Under normal circumstances, ground tracking should not be used for elimination of hot

rocks. It is recommended for use in areas with changing soil types.


In principle, there are two reasons for the presence of a metal under a hot rock. The first one is

easy to guess if you are in a frequently searched area. It is a hard task for average or simple

detectors to find metals under rocks. These detectors will generally miss the metals and thus

make them available for you and protected from others. For this reason, a missed target by

another detector makes you lucky for reading this manual and using the FORS Gold.

The other reason is a geological one and is a commonly encountered situation in gold

prospecting fields. There has been a correlation between the formation of hot rocks and the

formation of gold underneath or around them within the millions of years geological process.

This fact really increases the possibility of the presence of gold under hot rocks.



FORS / Page 27