Magnetic data has a wide variety of applications in preliminary and detailed phases of mineral exploration. For example, in petroleum exploration, magnetic data is used to map depth to the sedimentary basins and decting major hidden faults that may control the variations in the basement topography. In mineral exploration, the magnetic method can be used to determine the geometrical and physical parameters of the hidden body. In this context an estimate of the true depth of the source of the magnetic anomaly to determine a drilling point and purpose magnetic very helpful. The local wave number is an automatic method for estimating the location, depth and structural index of anomaly. This thesis presents an enhancement of the local wave number method for interpretating anomalous magnetic data. In this method local wave number is applied on potential field data to calculate the source depth. The major merit of local wavenumber method is to estimate depth of magnetic sources without a priori information about the nature of the sources. The first step is to determine the depth of the deposit, its stability and accuracy based on the solution of the wave number equations. Next, the source depth is esitimated at the same location through applying Euler's, power spectrum, source parameter imaging and experimental methods. In this method, the smaller wavenumbers are obtained through low-pass filtering in wavenumber domain. The eliminated larger wavenumbers that represent short-wavelengths associated with small surface sources are discriminated from deep anomalies. The main advantage of local wavenumber method is its independency on the source geometry parameters and magnetic susceptibility. In this study the local wavenumber and other methods are introduced and their advantages and disadvantages are discussed through applying them on real data from a magnetic anomaly in Arjin in Zanjan Province, Iran. Finally, the estimated depths using different methods are compared based on relative error resulting in local wavenumber method 10%, Euler's method (15%), power spectrum method (12%), source parameter imaging method (25%) and experimental Parasnis method (20%). In addition, a number of three boreholes having the least drilling depths to the manetic body are proposed.