85Choosing the Right Coil for the Job
There are five main things you should consider
when deciding which coil is best for your
terrain and target:
Coil Size and Depth
A larger coil will typically find targets buried
deeper in the ground but they can be less
sensitive to smaller targets. A smaller coil is
typically more sensitive to small targets, but
does not go as deep as a larger coil.
Mineralisation
A Monoloop coil will often have improved
performance over a Double D coil but can be
more difficult to Ground Balance and therefore
possibly more noisy. A Double D coil is often
more stable in heavily mineralised areas.
Terrain and Vegetation
A small coil can be easier to manoeuvre
through thick scrub or rough terrain. A smaller
coil is also a lighter weight than a larger coil.
Discrimination
In areas where discrimination is required a
Double D coil is necessary for Iron Reject to
work. In high trash concentrations a smaller
coil is preferable.
Search Pattern
A Double D coil will typically provide a 'blade-
like' detection pattern from the toe to the
heel of the coil, which gives excellent ground
coverage. A Monoloop coil has a detection
field that is typically cone shaped, which
requires overlapping of sweeps to ensure
thorough ground coverage.
Note: Third party coils and accessories are
also available. These are not manufactured,
warranted or supported by Minelab. Please
note that after market coils used with a GPX
Series detector in some Soil/Timings settings
such as “Fine Gold” and “Enhanced” are likely
to either not work or produce significant levels
of spurious signals from mineralised soils.
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