Keating Magnetic Correlation Coefficients for Kimberlite Exploration
Keating's method utilizes a simple pattern recognition technique to locate magnetic anomalies that resemble the response of a modelled kimberlite pipe.
The magnetic response of a vertically dipping cylinder is computed in grid form. The model parameters that may be adjusted include the depth, radius and length of the cylinder, the local magnetic inclination and declination, and the spatial extent of the anomaly. The model grid is then passed over a grid of total magnetic intensity as a "moving window". The correlation between modelled and observed data is computed at each grid node using a first-order regression and archived. The correlation coefficients that exceed a specific threshold (e.g., 75%) are retained for comparison to the magnetic and other exploration data.