Metal detector (MD) is a very important tool for most of us THs (treasure hunters). Treasure hunting without a MD is actually a huge lost on your part unless you are working on a site where you already know the exact location of your buried target. Or, there are signs that clearly tells you what exactly you need to do.

Coin hunters tends to use standard or even cheap metal detectors in locating their targets underground. MDs on this category can only detect shallow depth and they are quite good at detecting small pieces of metallic objects. This makes the tool perfect in locating lost coins or jewelries that were accidentally dropped by people in the past. It’s because they are likely buried at shallow depths.

Yamashita THs use a different level of MDs that are far more sophisticated and powerful (in terms of depth penetration) as compared to those being used by the coin hunters. It’s because their targets are large deposits containing volume of precious treasures buried at a quite depth.

It really sounds promising that if you happen to possess one of the most powerful and accurate MD today, finding hidden treasures would be so easy. Unfortunately, no equipment is yet to be invented.

At some point, when metal detecting at a certain area, you may have already experienced where your MD suddenly goes crazy. It actually gives a lot of false signals where it seems to respond on some random spots or locations. Then when you dug it and reached the level of the object as indicated on your equipment, you cannot find anything.

What could be the reason?


The main culprit is actually the ground properties of the area that you are trying to detect. There are so many natural objects underground that can cause erratic behavior of your equipment.

Anti-Metal Detector Underground

If all metal detectors are capable of detecting metallic objects deep underground so “accurately” then we THs would all be successful on our projects but the truth is, it is unlikely “not”. MD industries are still on the process of finding a solution on how to deal with the natural interference under the ground.

Here are the following anti-metal detector that can be encountered underground:

1. Hot Rocks

When metal detecting on an area filled with hot rocks under the ground, this often causes erratic behavior to your equipment. Although, hot rocks do not contain any valuable mineral such gold, silver or copper but they do generate strong positive signal from a MD. This makes these rocks the most annoying natural anti-metal detector.

2. High Mineralized Type of Soil

There will always be places where there are high concentration of mineralized soil. One type of minerals contained in a soil is iron. Metal detecting on an extremely mineralized soil can actually turn your MD blind even when the object is just lying on the surface of the soil. Gladly, MD manufacturers are able to find a solution called “Ground Balancing”. Most deep penetrating MDs are now equipped with this function which allows the equipment to ignore minerals in the soil.

3. Asphalt

The JIA (Japanese Imperial Army) did covered most of their treasures especially the gold with asphalt. This are the type of asphalt that MDs will fail to recognize what’s underneath it.

4. Metal Scraps or Garbage

The best treasure hunting site for coin hunters are on old abandoned places where they have high chances to detect lost valuable items on the ground. However, along with those precious objects are metal scraps or a lot of trash with no value. These worthless garbage can actually interfere while metal detecting especially those MDs with poor discrimination features.

5. Termites and Ants Nests

Some MDs are capable of detecting holes underground which is specifically used in locating man-made tunnels. Unfortunately, termites and ants that dwells under the ground also knows how to create their own tunnels. As a result, it often gives false alarm to the equipment.

18 Comments to “What Makes Your Metal Detector Go Crazy?”

    • Good day sir, just asking on how will I cook a gold with mixture of asphalt?

    • Just cook it at extremely high temperature.

    • Good day Sir Elmo,

      Its true that metal cant detect the gold if it is mix with alquitran or aspalt but what i am sure is the signs and my dowsing can confirm it, but my problem sir is what kind of cook are we going to do to separate or identify the gold mix with alquitran, what chemicals i have to used for cooking with it, please help us sir for this situation.

      Thank you sir and hoping for your immediate answer. God Bless



    • You really have to cook it at a very high temperature and overtime. Doing this will cause the Alkitran to evaporate itself being separated from the gold.

    • Thank you very much sir for the helpful idea, I've inform you sir for any development soon…

    • Sir, I would like to ask the metal detector called "md5008" if it is really accurate?

    • I do not own this kind of MD but based on my research, some people claims that it is very sensitive to high mineral ground soil.

    • Hi, Sir. There are plenty of rocks found in the creek specifically the head of creek on our farm. One that caught my attention is the big rock with frog head engraved on top with the tongue out when you are 15 meters away on east side of the rock. Along with other rocks with X or Y sign and some with 3 holes bigger than hen's egg. All of these signs visible around the said big rock.

      Please help. Is there treasure on the rock?

    • The frog here is pointing you towards a certain direction. This direction is probably on the old creek right exactly at the intersection which is indicated by the Y sign. While, the X sign represents the location of the item and the three holes probably means, three separate deposits.

    • Hi Sir,

      I have a question. So, my grandfather buried an antique plates and bowls in the ground. It was long ago during World War 2. He told my mother (his daughter) where to find it when he was dying. He gave a location and a sign to find it. He told my mom that it is right between a lagnob tree and a large rock. After my grandad's burial, my mom came to see what my grand dad has said. But unfortunately, the tree wasn't there, it was dead and has decayed. And the large rock was rolled away. So, it was difficult for her to identify where is it. So, my question is, how we will be able to detect and find it?

    • If some of the plates buried by your grandfather are made of metals then a good and reliable metal detector can easily locate them. However, if it is made of ceramic then you last option is to excavate the entire area. Anyway, he might had buried those antiques at a shallow depth.

  • I have encountered a rock with engraved triangle marking on top and about 5 meters again a rock with engraved cricket marking on top which beside is a shaped human skull rock, what were these means?

    • It means that the item is hidden in one corner of the area, however, it is equipped with booby trap.

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