...so we had a volcanic eruption 3 billion yrs ago where the greens are sitting and one 2.7 billion yrs ago East / South by wallace lake down to central Manitoba mine.Then the big Ross Pluton swirled into a major blast 2.5 yrs later with high pressure gases and fluids forcing their way through brittle cracks and morphing with the volcanics .. Here is a high resolution image of Ross Pluton..and a second one of San. Over lap the two and notic where the large magnetic stuctures lye. PS " compare on Google earth.

San magnetic image of the Greens...'pluton' map

...also a high magnetic image of the belt...'pluton' map...7