Indeed, depending on the size of the target you are looking for, the size of the coil will quickly change the size of the target the gold detector can find. Smaller coils are more sensitive and therefore better suited for smaller targets. Here you can search for a smaller target. Smaller coils are also better suited to areas with more debris. Larger coils can reach the bottom and cover a larger area quickly. However, smaller coils will be less sensitive, and larger coils will suffer from excessive mineralization. In addition to coil sizes, there are also two types of coils. Concentric coils have the highest discrimination and are ideally suited for areas with high waste content. Broadband coils are less discriminating but are more discriminating in areas of high mineralization. The best coil type will depend on where you are trying to find gold and the environment.