A Modified Tilt–depth Method for Kimberlite Exploration

There are many enhancement techniques available for potential field data, such as horizontal and vertical derivatives, vertical continuation, pole reduction, etc. The Tilt angle (Miller and Singh, 1994) produces a balanced vertical derivative which can be particularly useful as an enhancement tool. Recently Salem et al (2007) introduced the Tilt-depth method, which produces depth estimates of vertical contacts which have vertical magnetisation (or have been pole-reduced). The method determines the depth as being half the distance between the ±45 contours of the Tilt angle. This paper extends the Tilt-depth method to the model of the gravity anomaly from a vertical cylinder, which can be useful in Kimberlite pipe exploration projects, particularly now that airborne gravity data is becoming more readily available.