Iron Reject Rejecting Ferrous Targets - Minelab GPX-4500 Instruction Manual

Iron Reject
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Rejecting Ferrous Targets
Range Off (All Metal), 1–10
Not all targets are clearly ferrous or non-ferrous. A
lot of targets could be described as 'maybe' ferrous.
Which of the 'maybe' targets that the detector
identifies as being ferrous is controlled by the Iron
Reject level. The low numbers use more caution and
will identify most 'maybe' targets as non-ferrous.
As the Iron Reject level is increased less caution is
used so that high Iron Reject levels will identify more
'maybe' targets as being ferrous.
A low level of Iron Reject will keep the discrimination
conservative. 'Maybe' targets will respond with a
normal non-ferrous signal and only definite ferrous
targets will cause the Threshold and target signal to
blank. If the target response is too weak for accurate
discrimination the detector will give a normal target
signal until you dig closer to the target and the
signal strength improves.
A medium level of Iron Reject is less conservative
and will enable you to reject more ferrous targets
from non-ferrous targets; yet it will not 'blank' or
reject most gold nuggets.
A high level of Iron Reject is very aggressive, but
very effective at blanking ferrous targets. With a
high setting some small desirable targets (e.g. gold
coated in ironstone) could be mistaken as a ferrous
target. This setting should only be used in very high
trash areas, or when using the detector in lower
mineralisation when searching for coins and relics.
Tip: Iron Reject will give A low level of Iron Reject requires a stronger ferrous
the best results when used signal before discrimination occurs. Very weak
in combination with the ferrous target responses will give normal 'all metal'
specially designed GP type signals. A high level of Iron Reject will cause
series, or Commander DD blanking on weaker ferrous targets.
coils, and will not work
Select the level of Iron Reject depending on how
when using Monoloop coils.
cautious you want to be and how much trash is
in the area.
If the area is heavily littered, you may want to be
less cautious and use a higher level of Iron Reject. If
Note: The Iron Reject
there is little trash in the area and it is mostly close to
function will not work
the surface you may prefer a more conservative, low
accurately with the Coil/
level of Iron Reject.
Rx switch in the Mono or
Cancel positions.
It is usually best to recover all targets, especially
when you are on a known gold producing site or a
successful patch. However, careful use of the Iron
Reject feature can be rewarding in areas other
operators have avoided.
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Caution: Iron Rejection will only work when in
General and Fixed Ground Balance, but best results
will occur in Fixed Ground Balance.
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