Nokta detectors Fors Gold - Manual (Page 29)

METALS UNDER HOT ROCKS
No matter what the reason is, a well adjusted FORS Gold will increase your chance of
finding metals under hot rocks. The combined effect of a metal and a hot rock is less than
the metal's effect by itself and the received ID will be different than the metal's expected
ID. The ID will be a combination of the rock's and metal's and based on how small the metal
is compared to the rock, it will be closer to the rock's ID. You should always keep in mind
that metals under hot rocks will never appear with their own metal ID.
For these reasons, you should always remember that in gold prospecting fields, it is
possible for gold signals under hot rocks to be reflected differently and for the device to
give a different metal ID and tone instead of gold. For example; a gold nugget under a brick
may generate an iron tone and ID instead of gold.
In reality a simple principle can save you a lot of time: ''If the target encountered is not a
rock, it can be metal''.
The key to finding targets especially under positive hot rocks is knowing the maximum ID
value of the positive hot rocks around you. If you are searching in the General Search
mode, keep an eye on the ID. If the ID is close to the rock and iron range, there is a high
chance of finding a target under the rock. Because ID Masking is not an option in the
General Search mode, you need to ignore signals based on the ID number on screen.
In the discrimination modes, if you eliminate hot rocks with a properly adjusted ID Masking
setting, you can hear the signal of the target under the rock if the target signal has a slightly
greater effect than the masked ID. The important thing here is that if you detect a target
and dig out a rock, you should note the ID you got before digging and use it as the ID
Masking value the next time.
For example; the hot rocks in your search field tend to give IDs around 3-4. In this case, you
should set the ID Masking to maximum 5. This way you can eliminate rocks and the signals
of metals underneath. If you set the ID Masking too high unnecessarily, you will lose metals
along with rocks.
If the hot rocks in your search area tend to give high IDs, then the chances of missing the
signals of small metals underneath will be high as well.
FORS / Page 28
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