88
89
•
Do not try to eliminate what might appear to be
a faint, isolated ground noise by balancing the
detector over the target; you may be ‘balancing out’
the target response from a deeply buried metallic
target. It is better to Ground Balance around the
target, without going across it, then switch to Fixed
and try Pinpointing.
•
Dig all target signals, even in previously detected
areas. The GPX-4500 has superior ground balancing
and depth so it is possible to find new targets in
well-worked areas where other detectors have
been unable to cope with the high degree of
mineralisation and/or salt.
•
In some goldfields a response may be received from
a concentration of orange/reddish dyke material or
clay. Remember, a metal target will get louder by
moving the coil even centimetres closer.
•
If detecting areas of extremely variable
mineralisation detect along the ground contours
rather than across them. This will often stabilise
the effect.
•
In heavily mineralised areas the operator may need
to sweep the coil 10–20 mm ( ½"–1") above the
ground. This should give a more stable Threshold
and less ground noise.
•
Very sudden or large changes in the mineralisation
of an area may produce a signal from the detector.
Usually this signal is very broad and often only
present in one direction.
Detecting Tips
Follow these hints and techniques to help you to
utilise the power of your GPX-4500, to ensure that
every trip is a success.
Identifying Target Signals
•
Metallic targets will usually give a ‘solid’ sounding
signal when the coil is swept across the object from
any direction. A metallic target generally produces a
short, sharp and mostly symmetrical signal. Ground
noises usually give a broad uneven signal when the
coil is swept from different directions and often may
only give a signal from one direction and no signal
on the return sweep.
•
If you are not sure if the sound is ground noise or a
target signal you should always investigate. Scrape
a shallow hole about 30mm (1") 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 probably ground noise. If the signal
remains the same, or becomes louder, it is likely a
metallic target. If you are still not sure make the hole
deeper and repeat the process.
•
A ‘halo effect’, which may be built up around a
buried metal object, makes the object appear to
be larger to the detector than it actually is. This will
be reduced once the target is disturbed from its
position in the ground (e.g. a small object, detected
at a substantial depth, may be more difficult to
detect once disturbed from the ground and lying
in the loose dirt. If the object is re-buried the ‘halo
effect’ will not be present).
For Maximum Gold
Recovery
Keep the coil as
close to the ground
as possible.
Listen carefully.
This is more important
than looking.
Slow down, do not
rush, take your time.
Have a positive
mind set and imagine
a nugget at every
next sweep!
Remember that
covering a small
section of ground
thoroughly will be
more productive than
randomly searching a
larger area.
Big Gold
Big gold at depth
gives a much different
response to the smaller
shallower pieces. The
signal is often quite
broad, and there is very
little pitch variance.
False Signals
If false signals are
occurring as you sweep
the coil, check that they
are not produced by
any metal that you are
carrying, such as your
pick, battery or steel
toe boots.
Move the coil closer,
and then further away
from your body, in
order to check if the
signals are coming from
these items. If they are,
increase the distance
between the coil and
these items.
Avoid carrying metallic
objects in your pants
pockets as these are too
close to the coil.
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