Isle Royale's Minong Mine Designated National Historic Landmark

February 5, 2021
The general appearance of the Indigenous mining cluster landscape today.  Each person is positioned at the center of an Indigenous mining pit/NPS
The general appearance of the Indigenous mining cluster landscape today. Each person is positioned at the center of an Indigenous mining pit/NPS

An area of Isle Royale National Park that was mined for copper perhaps as many as 4,600 years ago has been designated a National Historic Landmark.

The Minong Mine Copper Mining District is on the northern side of Isle Royale, a bit west of McCargoe Cove. The designation announced this week celebrates the national significance of Indigenous and historic copper mining that occurred at the Minong Mine. "Minong" is the Ojibwe term for Isle Royale.

The NHL boundary covers more than 200 acres and encompasses the Minong Mine archaeological site and the McCargoe Cove occupation archaeological site. The Minong Mine site includes both the Indigenous copper mining pit concentration and the historic remnants of the Minong Mining Company. The McCargoe Cove site includes both an Indigenous occupation site and the remains of the historic village of Cove.

Archaeological and historical evidence suggests copper mining activity by native groups started no less than 4,500 years ago, a park release said. Mining continued through the 1880s.

As highlighted in the nomination report, authored by Dr. Daniel Trepal of Michigan Technological University with review by multiple specialists, the Minong Copper Mining District is nationally significant because it showcases the intimate connection between North America’s most significant Indigenous and historic native copper mining activities. The site has high integrity and combines one of the largest, best preserved Indigenous copper mining landscapes with the well-preserved remains of the largest historic copper mining operation on Isle Royale.

This map, from An Archaeological Reconnaissance of Isle Royale, locates the Minong Mine site/Michigan History
This map, from An Archaeological Reconnaissance of Isle Royale, locates the Minong Mine site/Michigan History

The Indigenous copper mining pit concentration within the Minong Copper Mining District is one of the largest ever found and is by far the most thoroughly studied, according to park staff. The Minong Copper Mining District figured prominently in several early archaeological investigations, contributing to the development of archaeological science with respect to understandings of Indigenous copper mining. Much of toay's modern archaeological knowledge of Indigenous native copper mining methods stems from field research undertaken at this site.

“This National Historic Landmark designation for the Minong Copper Mining District cements its stature as an exemplary archaeological site,” said Isle Royale Superintendent Denice Swanke. “Indigenous mining activities figured prominently in the park’s 1931 enabling legislation and the district benefits from being in designated wilderness within a national park, which will help ensure retention of a high level of integrity.”

Fred Dustin, who was part of a University of Michigan anthropology team that surveyed Isle Royale in 1929 and 1930, recounted that at the Minong Mine site they discovered that "prehistoric (mine) pits gradually increase in number until they become so thick they run into each other a little west of the main working of the Minong."

"Leaving the old mine, we climbed up the cliff to Arthur's Lookout, and proceeded northeast along the ridge for about forty rods, where we discovered an ancient pit," noted Dustin. "Here the rock masses dip to the north instead of the south, and apparently had made the ancient miner's work easier for this reason. Several battered hammerstones were lying around, and a copper stain near the bottom of the pit indicated the probable location of the red metal that had been beaten out by those crude but effective tools."

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