Rocks and Searching in Rocky Terrains
Magnetic Mineralization Indicator
Challenging ground conditions arise especially when conductivity and magnetic properties of
the ground is too intense. Operation of the device over such ground is made possible by
selecting the best operating mode and using proper ground balance, gain and threshold
settings.
Stones and rocks or cavities inside the ground are as important as the ground itself in regards to
the search and target detection quality.
Soil and rocks have two different properties just like the targets you are searching for. One of
them is the intensity and the other one is the conductivity - magnetic permeability ratio and
these two properties are independent from each other. In this manual, the conductivity -
magnetic permeability ratio will be referred to as ID in short. High magnetic permeability, low
conductivity results in low ID. Soil or rocks can be highly permeable and have low or high IDs as
well. If the conductivity increases relatively to magnetic permeability then the ID will also
increase.
Hot rocks are classified as negative or positive based on their ID being low or high in comparison
to the ID of the soil they are in. One or both of the types may be present in a field. The negative
and positive effects mentioned here will only be valid if ground balancing is properly done on
the existing ground. Otherwise, soil itself will not act differently from hot rocks in terms of ID. In
''TRACKING'' however, conditions will differ. Therefore, the effects of rocks in ''TRACKING'' will be
discussed separately. Here we are referring to a proper ground balance without ''TRACKING''.
Positive rocks act just like metal and produce a metal sound. In the All Metal mode they produce
a “zip zip” sound when the search coil is moved over them. If the signal is strong enough, the
device may produce an ID for these rocks. Negative rocks in the All Metal mode, produce a long
“boing” sound when the search coil is moved over them. The device does not give an ID for
these rocks even if the signal is strong.
The Magnetic Mineralization Indicator consists of 8 levels.
The indicator is shown empty at low mineral levels during
search and at start up. In areas where the magnetic mineral
level is high, the indicator level increases according to the
intensity. This measurement can be summarized as the level
of magnetic property and intensity of the ground. Simply, if
you are working in an area which contains intense and
magnetized minerals, the level will be high. If you are
working on a less intense ground, the level will be low.
This measurement is important from two aspects. First, on grounds with high magnetic
mineralization, search depth is low and users should be aware of this fact. Second, magnetic
mineralization is a property which is particularly seen with mineralized rocks and this
measurement plays an important role for the device to eliminate the false signals produced by
these rocks.
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