From the record
“Copper Peak is a ski flying hill designed by Lauren Larsen and located near Ironwood, Michigan, United States. It was built in 1969 and inaugurated one year later.”
Wikipedia article Copper Peak, CC BY-SA 4.0.
One of 11 National Register listings published here for Gogebic County · listed in 1973 · category: Site.
Sources: the Wikipedia article · the National Register database, National Park Service