The Black Mountain on Kennon Project whose property is located at Camp 6, 12 kilometers south of Baguio City along the Kennon Road proposes to drive their main haulage level across the Bued River. To obtain information from the back of the proposed tunnel, a geophysical survey was conducted over the area to determine the thickness of the overburden above the proposed tunnel. With the thickness of the overburden known, the back of the tunnel can then be easily computed.