RE: "On the shores of Gitche Gumee"

There is gold in the black sand on Lake Superior. Bring a sluice next time you go. It comes from a 2.5 Billion year old volcanic eruption up in Marathon Ontario. We get a few grams of gold every summer …

The volcanic rocks near Marathon, Ontario, were formed over 2.5 billion years ago. These are ancient, dormant volcanic structures found on the Canadian Shield near Lake Superior, not recent eruptions