Minelab GP 3500 Manuel d'utilisateur télécharger pdf (Page 23)

detecting techniques

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page 38

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GP 3500

Covering the search area

• As the user moves forward slowly, the search pattern should resemble a snaking path.

• To ensure that productive ground is thoroughly searched, approach the area from

3 different directions.

Overlap each sweep

• Each sweep of the coil should overlap the area covered by the previous sweep to ensure

a full coverage of the area being searched.

• Be aware of the search pattern of the coil being used and overlap sweeps to take this

pattern into account. If using a Monoloop coil a tighter overlap is required to ensure that

targets at maximum depth are not overlooked.

• See also Pinpointing Technique,

page 41.

Figure 5.2 Search path

Figure 5.3 Search area from

3 directions

prospecting techniques

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GP 3500 GP 3500

www.minelab.com

page 39

The GP 3500 has superior ground balancing and it is possible to find quite large

objects near the surface in well-worked areas where other detectors have been unable

to cope with the high degree of mineralization and/or salt. Therefore the user should

dig all target signals, even in previously detected areas.

• Very sudden or large changes in the mineralization of an area may produce a signal

from the detector. Usually this signal is very broad, and often only present in one

direction.

• In some goldfields, a response may be received from a concentration of orange/reddish

dyke material or clay. Remember, a metal target will get louder by getting the coil even

centimeters closer.

• If detecting areas of extremely variable mineralization, detecting with the contours rather

than across the changes will often stabilize the effect.

• In some ground (particularly heavily mineralized areas) the operator may need to sweep

the coil 1 or 2 cm above the ground. This should give a more stable threshold and less

ground noise.

• With faint or indistinct signals that you are not sure of scrape a few centimetres off the

surface with your pick and see if the signal becomes clearer.

Big GOLD.

Many detector operators have no trouble finding their share of small gold, but often are

disappointed at the lack of larger gold found at depth, even though they have dug up to

1m for a soft drink can or a horse shoe. The reason is that big gold gives a much

different response to the smaller shallower pieces. The signal is often quite broad, and

there is very little pitch variance. Just something to be aware of.

For Maximum Gold Recovery

• Keep the coil as close to the ground as possible.

• Listen very carefully - this is more important than looking.

• SLOW DOWN! Do not rush, take your time.

• Have a positive mind set, and imagine a nugget at every next sweep!!

• Remember that covering a small section of ground thouroughly will be

more productive than randomly searching a larger area.

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Minelab GP 3500 Manuel d'utilisateur Page 23

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