Electromagnetic Interference (Emi); Large Or Complex Ferrous Objects; Non-Ferrous Objects Masked By Nearby Iron; Coin Buried Deep In Mineralised Ground - Minelab MANTICORE Instruction Manual

Target Trace

Electromagnetic interference (EMI)

EMI often appears as a concentrated smudge near IDs 0 and 2, similar to a very low
conductive coin� There are often some accompanying random scattered Traces�

Large or complex ferrous objects

Ferrous objects with complex shapes can often create unusual shapes on the target trace, and like bottle caps, are usually
variable with orientation�
Such targets often have ferrous material properties, but also have large cylindrical shapes (e�g� bolt heads) with highly
conductive properties� In some orientations, these can result in a target trace that slants down and to the right, from the
upper ferrous region into the non‑ferrous region�
Sweeping over the complex target from different directions while checking the target trace can provide a better indication
of the ferrous properties of the target�
A thick rusted iron bolt falsing in
one orientation�

Non-ferrous objects masked by nearby iron

Non‑ferrous objects with nearby iron trash can also create an unusually shaped Target Trace�
Often iron trash is much stronger and dominates the detection, pulling the target trace towards the ferrous region�
However with the superior target separation of MANTICORE, the non‑ferrous target can often be seen to pull the target
trace just into the non‑ferrous region, unmasking the non‑ferrous detection�
A medieval cut quarter
farthing (coin)�

Coin buried deep in mineralised ground

Mineralised ground creates special challenges for discrimination, because the detector sees the target as a mixture of
signals from both target and ground response� This can create three dark Traces; one in the upper ferrous region, one on
the centre line where the coin would appear if detected in air, and one in the lower ferrous region� They are sometimes
connected by a vertical line�
CONTENTS
(Continued)
The same thick rusted iron bolt
checked from a different direction,
more clearly showing it is ferrous�
An iron nail on its own�
A hammered coin (low conductor) buried deep in
highly mineralised soil, showing a solid Target ID, but
uncertain ferrous characteristics due to being mixed
with the ground signal response�
A thick iron nail with large square
head falsing�
29
A screw with a large hex
head falsing�
A medieval cut quarter farthing
(coin) next to an iron nail� Note how
the coin pulls the target trace down
and in the direction of the correct ID
for the coin�