This illustration presents the GT-GRID total magnetic field map of the Alpha kimberlite at 80 metre terrain clearance and 150 metre line spacing together with the corresponding ground magnetic contours. The northern extension, trending near parallel to the flight direction, is correctly rendered by GT-GRID.

calculated from the GT-GRID of total magnetic field.

The lower illustration presents the total field, calculated vertical gradient and calculated surface magnetic component. The sinuous EW anomaly is related to modern drainage that cuts into and removes magnetic glacial till, creating a negative anomaly. The sinuous NS anomaly is related to Paleo-drainage that has cut a channel into the underlying rock surface and provided a keel of thickened till to produce a positive anomaly. These anomalies of about 2 nT amplitude are clearly rendered by the GT-GRID process.

GT-Grid Model examples:

• Kimberlite Pipe Model Example



• Geologic Structure Model Example