“…The gravity method involves measurement of minor variations in gravitational attraction at a point caused by variations in near surface rock densities and other factors. Some of the classical gravity studies are by West and Sumner (1972), Ibrahim and Hinze (1972), Carmichael and Henry (1977), Stewart (1980), Hansen (1984, Ghatge and Hall (1989) and Allen and Michel (1996). Being a potential field measurement it has inherent ambiguities and may require support from other passive and/or active methods for confirmation.…”