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The Bahal III temple is ancient relics temple of the Hindu Kingdom. The research is aim to know the under layer structural of Bahal III surface and to determine the minerals contents of boulder sample in Bahal III temple in Portibi region, North Padang Lawas. The research methods are Geoelectric and geomagnetic, and XRD methods. Geoelectric method that used in this research was Wenner-Schlumberger method in two lines. Line length is 155m with 32 electrode and 5m distance each. Geomagnetic method was done by using 60 grids. Geoelectricity data processing used Res2Dinvand software while geomagnetic data processing used Mag2DC software. Data processing of layer contouring used surfer11 software. Data processing of XRD test result used Match3 software.The findings showed that andesite rock layer was found by using geoelectric method with resistivity value 950 - 1500 Ωm suspected as the rock of temple forming in depth 3-12m. Geomagnetic test results showed the susceptibility value 0.034(cgs unit) which is andesite rock. XRD test result for minerals contents of the temple boulder sample was dominated by mineral Silicon dioxide (SiO2) 88.8%, Ferric oxide (Fe2O3) 8.9 %, Magnesium oxide (MgO) 1.7% and Titanium dioxide (TiO2) 0.7 %.