Nif (Olympos) Mountain is a wide archaeological site in west Anatolia (Turkey). Surface investigations and excavations have been done in the area since 12 years. The magnetic method as a geophysical prospection method was applied on an area of 500 m2. This method was chosen because such a prospecting technique provides a great amount of high-resolution magnetic data in a very short time. A correlation could be made between the derivative methods used in this study. Analytic signal (AS) method revealed not only grave but also surrounding stones. The total derivative method could not separate stones and grave. Normalised Standard Total Derivation (NSTD) method gave similar results with AS.