The Aeromagnetic Discovery of Kimberlites And Sulphides At Depths Up to 200m.

In 1994 a kimberlite exploration program was initiated in the James Bay Lowlands of Northern Ontario, Canada. The area is covered by lakes and bogs on top of a Paleozoic sedimentary cover with no outcrop within hundreds of kilometres. Several kimberlites had been identified and a wide area search of more than 10,000 square kilometres was initiated to locate additional pipes. An aeromagnetic survey procedure, interpretation methodology, and drill siting procedure was designed to identify and test the interpreted kimberlite targets. Using the magnetic method alone, the program identified seven kimberlites at depths up to 150m, and six sulphide zones up to 200m below surface.