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The range of coils available has recently broadened to several more coils being made available.  Is it really necessary to have such a wide range?  How many coils should you have?  Which is the best for you? Will they help you get more gold? 

Some customers save hard to purchase their new metal detector and are reluctant to spend more money for an additional coil or two. Is that a wise decision? Or should they invest another several hundred dollars to make their metal detector more viable? 

These are good questions so I will try to explain the advantages and disadvantages of the various coils presently available. 

There are two main types of search coils currently on the market – the concentric and the wide-scan.




The concentric coil uses two round antennas, one inside the other. This coil is used on most detectors that are designed for coin, jewellery, and relic hunting. Concentric coils discriminate very well and pinpoint very easily because the strongest signal is always in the center of the coil.




Wide-scan coils use two D-shaped antennas that are placed back to back. Because of this configuration, they are also called “double-d” coils.

The wide-scan coil is less affected by mineralization than the Concentric, so it is generally used for gold prospecting or relic hunting in bad ground. Pinpointing is done with the heel or toe of the coil.


After determining the type of coil that is best for your type of hunting, the next thing to consider is the size.


There are many different sizes of coils available and each one may fine tune your hunting but only if you get the correct size.




Larger coils go deeper than smaller coils but only on larger targets. When using a large coil, you may lose sensitivity to small targets. A large coil is also more susceptible to masking. Masking happens in the discriminate mode when a good target and junk target are both under the coil at the same time.


If the targets are close enough together, the bad target will be discriminated out, and at the same time, the detector will not be able to pick up the good target. Masking is very common in junky playgrounds and in-and-around old house sites.




Smaller coils will concentrate the signal and make the detector more sensitive to the little targets. Unfortunately, smaller coils tend to lose depth when compared to their larger cousins. Being that these coils don‘t have as wide a search pattern, they are also less likely to mask targets in trashy hunting situations.




Clean Sweep coils uses wide-scan technology to provide tip-to-tip sensitivity. A wider detecting sweep means less time over unproductive ground and more time finding the goodies you want. The wide-scan design resists changes in mineralization.  




Printed Spiral Coils  are made only by Tesoro for use with pulse induction circuitry. It offers good sensitivity to a broader range of target sizes and improved sensitivity to less conductive targets such as fine gold chains.



The benefit of using a Mono coil is that it goes deeper than a DD coil of an equal size.  However, Mono coils can be somewhat noisier in heavily mineralized ground and they will not allow your machine to use it's discrimination abilities.  It is best used in the "all metal" mode.

A Mono coil is more sensitive to small gold and is easier to pinpoint with.  Most seasoned prospectors in the United States prefer mono coils over DD's.



Frequencies in a metal detector are referred to in kHz (kilo hertz) which is the number of times a signal is transmitted into the ground as received back per second.   


The lower the detector's frequency, the deeper it will penetrate.  However, its sensitivity to smaller targets may be reduced.  


On the other hand, the higher the detector's frequency, the higher its sensitivity to even the smallest targets, but it may not penetrate as deeply. 


Generally, gold detectors operate at a higher frequency for locating small gold nuggets.  Coin, relic and treasure hunting detectors operate at lower frequencies for greater depth penetration 


Knowing where you are going to hunt and what you are hunting for will go a long way in helping you choose the right coil for your needs. A larger coil is needed when hunting in a clean area or when hunting for relics that may tend to be deeper. A small coil will help find the smaller targets such as gold nuggets or fine jewelry or can be used when coin & jewelry hunting extremely trashy sites.

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