Answer :

Final answer:

Copper was the natural resource that was mined in Isle Royale National Park, with substantial operations in the mid-19th century by European immigrants. These operations have since ceased due to various issues.

Explanation:

The natural resource that was once mined in Isle Royale National Park was actually copper. It wasn't gold that was sought after in this region, unlike in California. Mining activities started hundreds of years ago by indigenous groups, and more substantially by European immigrants in the mid-19th century. The operations eventually ceased because of financial difficulties and environmental concerns. Today, the remains of this industrial history, like old mine shafts, can be witnessed while exploring the park.


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