A rock or piece of mineralization that is different in its mineralization content than the surrounding ground matrix. Hot rocks can produce false signals in some operating modes and no response in others.

A rock containing minerals, which creates a false signal by the metal detector

A rock which contains a higher concentration of nonconductive ground minerals than the surrounding matrix to which the detector is balanced. A metallic (positive) response will be heard in the motion and non-motion modes and a null or negative drop in threshold is heard in the all-metal, ground balance mode over these rocks. solator: A nonmetal stem which attaches the searchcoil to the control shaft eliminating metallic interference in the detection pattern. On some detectors, the entire lower shaft is made of a nonmetal substance.