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Lake Superior
They were of green stone and porphyry boulders. Selecting a stone of the desired size and form, the ancient miner cut a groove, arched it so that it might be secured by a withe and thus wielded as a sledge hammer."
After this discovery the Ontonagon District speedily assumed such importance as to over-shadow the older Keweenaw District. The country was rapidly filled with enterprising people, and much eastern capital sought investment therein.
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