Ontonagon and the Boulder That Started a Copper Rush

On the south shore of Lake Superior in Michigan's Upper Peninsula, the port town of Ontonagon sits at the mouth of the river that carries its name. It is the oldest permanent settlement on this stretch of the Lake Superior shoreline, and it owed its early significance to a single object: a boulder.

The Ontonagon Boulder is a mass of nearly pure native copper weighing three thousand seven hundred and eight pounds. It had been sitting on the west branch of the Ontonagon River for longer than anyone could measure when the first Europeans arrived. The Ojibwe people knew it well and regarded it with reverence, a sacred object whose manitou, or spirit, could bring healing to those who made offerings at its base. For generations it was a place of ceremony.

When Mackinac trader Alexander Henry traveled thirty miles upriver in seventeen sixty-six, he cut a hundred-pound piece from the boulder and reported back to the east about what he had found. The news spread slowly. Then, in the early eighteen forties, the federal government began surveying the Lake Superior copperbelt, and speculators flooded in. The Ontonagon Boulder became famous, a symbol of the mineral wealth supposedly waiting beneath the Upper Peninsula. In eighteen forty-three, it was shipped east and eventually came to rest at the Smithsonian Institution in Washington, where it remains today.

The copper rush that followed transformed this corner of Michigan. From eighteen forty-five to nineteen sixty-eight, more than eleven billion pounds of native copper were extracted from Ontonagon County and the Keweenaw Peninsula, a run of industrial extraction without precedent in American mining history. Ontonagon's port served the mines. The town grew, then shrank when the ore ran out.

What was taken from the riverbed in eighteen forty-three stands in a museum case in Washington. What was taken from the ground over the following century shaped the Upper Peninsula still.