Minelab Eureka Gold Servisní příručka stáhnout pdf (Strana 16)

Page 28 The Minelab Eureka Gold

The target could be anywhere along the length of the coil from head to toe.

In order to pinpoint its exact location, it will be necessary for you to turn at

a 90 degree angle and repeat the sweep across the target.

Again take note of the point where the strongest signal is and draw another

imaginary line in the ground. Where the two imaginary lines cross is where

the target is located. Use the side of your boot to mark this location if

necessary.

9.3 Digging the Target

Always remember that when digging, the hole should be kept as small as

possible to keep the size of the hole to a minimum.

Dig carefully as a heavy blow can split a nugget, causing a drop in its

value. All holes dug must be filled in once the target has been recovered.

It is advisable to have some sort of digging tool when searching. Useful

tools are:

• A small hand pick with pointed end and wide blade the other end.

• A small strong digging spade.

• A small knife for grassy areas.

Before digging, clear the surface material and check that the signal is still

there. If there is no longer a signal, then the target must be amongst the

surface material and is possibly trash. If the signal is still there, dig down a

few centimetres. Dig a dish-shaped hole; any sharp edges of soil might

cause a false signal.

If the target is not visible, sweep the coil over the hole. The signal should

become louder so continue to dig. If the signal has gone then the target

should be in the pile you have just dug. If the target is not clearly visible,

you might need to scan the soil which has been dug up, so be sure to pile

the soil carefully while digging.

The target can be located in this soil by the following methods:

a) When digging and locating the target, ensure the Balance control is set

to Fixed.

b) Sweep the coil over the pile of soil to locate the target. Be sure that there

are no targets buried under the soil directly below the pile.

Page 29 The Minelab Eureka Gold

d) Pick up a handful of soil from the pile where you located the target and

pass it across the coil. If there is no signal then place the soil in a

second pile away from the first and grab another handful from the same

area of the pile. Continue this process until the target is in your hand.

Look through the soil in your hand until you find the target.

e) If the target is not obvious, dribble the soil slowly from your hand onto

the top of the coil and listen for the target signal.

f) Then use your fingertip to nudge any suspect items on the coil. The

detector will signal when the target is moved.

Once the target has been recovered it is a good idea to run the detector

over the hole again to make sure that there are no other targets to be

found. When you have recovered all targets from the hole, it is advisable

to search the surrounding area carefully as there is a high chance that

more targets will be nearby.

9.4 Automatic Ground Balancing

These simplified diagrams (see Figure 20 overleaf) show how Automatic

Ground Balancing with the Eureka Gold allows you to detect to its

maximum depth at all times.

The top diagram shows normal searching without Automatic Ground

Balancing. Ground mineralisation reduces the effective searching depth

when you move from where you last ground balanced. The shaded area

shows ground which is not properly searched.

The centre diagram shows how a hardworking, experienced professional

with a manual ground balance machine will reduce this effect to a

minimum. The detector is rebalanced more often, and this is very

time-consuming.

The bottom diagram shows how genuine Automatic Ground Balancing

covers all the ground quickly and effectively. This ensures that the

detector with automatic ground balancing will give optimum depth at all

times. For this to occur, the detector must balance quickly enough and still

retain sensitivity.

c) Lay the detector down with the coil flat on the ground, near the hole.

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