Located to the west of Salt Lake City the Bingham Canyon Mine remains the largest man made excavation in the world and easily visible in Google Maps with this link. This page is primarily included for all the young engineers specifically my grandson.
Here I finally got a rather decent panorama stitched together showing the mine from the top of the visitors center which I understand is closed due to a massive landslide in 2013. If your planing to visit Salt Lake City here is an alternate Bingham Mine View complements of Trip Advisor.
Just to compare the little toy trucks you can see down in the mine use these little tiny tires you can see with the people in the background. Engineer's dream.