According to science Sudbury is an ancient meteor impact crater.
There are two impact craters at Sudbury. One inside of another. Billions of years apart.
According to science Sudbury is an ancient meteor impact crater.
Heavier materials (like iron, gold, etc) all settled deep below the surface when the planet was young and hot and still in a (at least partially) liquid or plastic state. Everywhere these metals are found close enough to the surface today to be mined is a sign of some manner of geologic disturbance, like plate tectonics or a meteorite strike, bringing those materials closer to the surface.