Official Site: https://www.nps.gov/kewe/index.htm
Wikipedia: https://en.wikipedia.org/wiki/Keweenaw_National_Historical_Park
Facebook: https://www.facebook.com/KeweenawNHP
Twitter: https://twitter.com/KeweenawNPS
Instagram: https://www.instagram.com/KeweenawNPS
From Wikipedia:
As of 2009, it is a partly privatized park made up of two primary units, the Calumet Unit and the Quincy Unit, and 21 cooperating "Heritage Sites" located on federal, state, and privately owned land in and around the Keweenaw Peninsula. The National Park Service owns approximately 1,700 acres (690 ha) in the Calumet and Quincy Units. Units are located in Baraga, Houghton, Keweenaw, and Ontonagon counties.
The Congressional legislation establishing the Park stated, among other things, that:
(1) The oldest and largest lava flow known on Earth is located on the Keweenaw Peninsula of Michigan. This volcanic activity produced the only place on Earth where large scale economically recoverable 97 percent pure native copper is found.
(2) The Keweenaw Peninsula is the only site in the country where prehistoric aboriginal mining of copper occurred. Artifacts made from this copper by these ancient Indians were traded as far south as present day Alabama.