Pinpointing
Pinpointing narrows down the location of a buried target,
allowing you to determine its exact location before
digging.
GPZ Super‑D Coil
Previously Minelab gold detection coils have been
available in two configurations, Double-D and
Monoloop. The GPZ 14 coil has a new configuration
called Super-D.
Double‑D
A Double-D coil has two overlapping
wire windings in the shape of two D’s.
The benefits of a Double-D coil are
stability (especially in heavily mineralised ground),
good depth, sensitivity and a very thorough search
pattern requiring less swing overlap.
Monoloop
Monoloop coils have one winding of
wire around the circumference of the
coil, which is used to both transmit and
receive. The signal pattern is cone shaped, requiring
more swing overlapping. In severely mineralised
ground they can be more difficult to ground balance,
but tend to achieve greater depth and are more
sensitive than Double-D coils.
Super‑D
The Super-D coil consists of one middle
transmit winding and two outer receive
windings which essentially form the
equivalent of 2 symmetric Double-D
coils, one on the left and one on the right. This
Super-D configuration means that targets close to
the coils surface produce a double response as the
coil is swept over the target, the same response for
each Double-D half. With targets further from the
coils surface, the coil behaves more like a traditional
coil, with the peak sound response occurring directly
below the coil’s central axis.
Super-D coils also have electronic calibration resulting
in quieter detecting, and have excellent detection
depth.
NOTE
Only Minelab GPZ coils are compatible with the GPZ 7000
detector.
Pinpointing a Target
To accurately locate a target, and reduce the size of the
hole required to remove it from the ground, it is necessary
to pinpoint the exact location of the target.
To pinpoint a detected target, sweep the general area
with the coil, taking note of where the strongest signal is
received.
It is important to know that GPZ series coils have two
zones where the target signal is strongest. These are
marked on the coil as two parallel lines running from the
front of the coil to the back of the coil.
Lines show the strongest signal zones.
By shortening the length of the sweep it should be
possible to draw an imaginary line in the ground where
the strongest signal is located.
Line up the target at 90° from the initial direction and
repeat the process. The object is located where the two
imaginary lines cross.
Pinpointing
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