As you likely had time to notice, any of firms does not publish the data concerning depth of detection metallodetektorov, or specify results only the laboratory researches, rather far from conditions of real search in soil. Differently, at field tests, unlike laboratory, it is necessary to consider set of the factors influencing depth of detection, as that: and many other things, and a soil mineralization it is possible to consider humidity of a ground, mineral structure (a soil mineralization) as a major factor influencing depth. Thus, when speech comes about depth of detection, it is not necessary to be inspired by advertising of the manufacturer or the seller asserting that is a constant. It is necessary to know accurately that depth is defined depending on many variables among which not only properties of soil but also as long the object has lain in the earth, its size, a material from which is created etc.
The main thing in metallodetektore ability to catch the necessary signal from the purpose, despite all obstacles with which real conditions abound. On achievement of this noble purpose the huge scientific, engineering and industrial forces which increase in potential is promoted by we are directed at present, giving completely not small money for modern metaloiskateli. And as money really considerable, to the buyer will not prevent to understand technologies, such as: multifrequency BBS, FBS, MPS, double pressure DVT, Double D.
So, the multifrequency detectors using the big range of frequencies, not only well ignore a mineralization, but also allow to find out equally well both small, and large subjects.
The matter is that the high-frequency signal, for example 72Кгц well reveals small (for example 2 mm) objects, but unfortunately is not capable to get deeply in soil, quickly fades at a surface. The low-frequency signal, for example 5 Kgts, on the contrary, will get deeply into soil, but small objects remain for it inaccessible.
Now concerning a mineralization and hot stones. As a matter of fact this one and too, only one small, and other big. And problems delivers approximately same. The soil has a concept "mineral structure". It can be various. The soil can be magnitno-sated, salty (beach) or still any. All it gives hindrances, can have conductivity, like metal and essentially reduces depth of penetration of a signal in soil. Hot stones it is simple cobble-stones which are capable to give the response, like a kind nugget or a coin as have the conductivity similar to metal and as a rule value does not represent.
In our practice there were many cases when we faced a strong mineralization, but one of areas was remembered especially. It was in 2000 in Bodajbinsky area on the rivers B.Chanchik and Ugahan. The soil mineralization was so big that unifrequent detectors reacted practically to each stone, (hot stones), as on the good purpose. At all our efforts, we could not build up completely unifrequent detectors from "hot stones" thus depth of detection 5 copeck of a coin did not exceed 5 the Detectors executed on technology FBS-Explorer see, MPS - SD2200d though have lowered sensitivity, approximately on one third, but continued to work steadily on so mineralizovannoj to soil without reacting to "hot stones". Our extraction has made more than 500 gramme gold nuggets.
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