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.
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.