A mineral bull’s-eye in the Oquirrh Mountains that is two and a half miles wide. I found a great selection of national geographic images - scans from old mags 60’s-80’s by Sarah Gossett here. Nicely curated.
Details on the image:
April 1975
“The company’s [Kennecott Copper] mineral bull’s-eye in the Oquirrh Mountains stretches two and a half miles wide and more than half a mile deep - the nation’s largest open-pit copper mine, and its most productive.”
From article Utah’s Shining Oasis by Charles McCarry, photographs by James L. Amos