Iron Reject Rejecting Ferrous Targets - Minelab GPX5000 Instruction Manual

Iron Reject
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Rejecting ferrous targets.
GPX 5000 Range
Off (All Metal), 1–10
GPX 4800 Range Off (All Metal), 1–10
Factory Preset Off (All Metal)
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 or
copper/silver artefacts.
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.
Caution: Iron Reject will not work when using a
Monoloop coil.
Iron Reject will give the best results when used in
conjunction with the specially designed Commander
Double D coils.
A low level of Iron Reject requires a stronger ferrous signal
before discrimination occurs. Very weak ferrous target
responses will give normal 'all metal' type signals. A high level
of Iron Reject will cause blanking on weaker ferrous targets.
Select the level of Iron Reject depending on how 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 there is little trash in
the area and it is mostly close to the surface you may prefer a
more conservative, low level of Iron Reject.
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.
Note: The Iron Reject function will not work accurately with the
Coil/Rx switch in the Mono or Cancel positions.
Low Setting
Ferrous
Horseshoe Nail Broken rusty tin Ironstone coated nugget
Caution: Iron Reject will function poorly when used in
conjunction with Tracking Ground Balance. Use Fixed
Ground Balance for better results.
High Setting
Non-ferrous
Clean nugget Copper coin
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