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Page 16
7.3 Hints for Maximum Gold Recovery
·
Keep the coil as close to the ground as possible.
·
Listen very carefully. This is more important than concentrating on
looking.
·
SLOW DOWN! DO NOT rush — take your time.
7.4
Identifying Target Signals
Metallic targets will usually give a "solid" sounding response when the coil
is swept across the object from any direction. Ground noises usually give
a broad uneven response when the coil is swept from different directions.
A metallic target generally sends out a short, sharp and mostly symmetrical
response.
If you are not sure whether the sound is ground noise or a target, you need
to find out if the signal is valid. Scrape a shallow hole about 70mm to
100mm deep over the suspected target. Sweep the coil over the hole at
the original ground level. Do not dip the coil into the hole. If the signal has
decreased in volume or is less defined, it is a ground noise. If the signal
remains the same or becomes louder, it is a metallic target. If you are still
not sure, make the hole deeper and repeat the process. You will also notice
that mineral noises are often experienced from one direction only, on the
return swing it is no longer there.
The "Halo Effect", which is built up around a buried metal object, makes
the object appear to be larger to the SD2200v2 than it actually is. This will
be reduced once the target is disturbed from its position in the soil.
An example of this is when a small target, detected at a substantial depth
with the SD2200v2, is barely or not even detectable once recovered from
the ground. Even if reburied, the "Halo Effect" will disappear.
It is not recommended that you try to eliminate what might appear to be a
faint, isolated ground noise by balancing the SD2200v2, as you might be
balancing out the response from a deeply buried metallic target.
The Minelab SD2200v2
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