EM4H is a most widely used airborne electromagnetic system in the territory of the Russian Federation. It is a fixed wing and helicopter borne frequency domain system, which is used as a mapping tool. The paper describes how it can be used for gold-rich sulphide deposits prospecting. A forecast parameter is obtained through an image recognition procedure. A known deposit is used as a reference. The forecast parameter obtained shows distinctive association of conductive magnetized zones with the zones of higher sulphides content.