Nice pix and different angle, which I like.
We went there with the kids in the '90's. It was a nice clear day in the summer, I had my K1000 with my old favourite lens, a Pentax 'A' 35-105 Macro zoom and got a few nice pix from the lookout point. We had some snacks in the cafeteria and it looked just the same as it did, in the famous kerfuffle scene with Cary Grant and Eva Marie Saint, in the movie North by Northwest.
We also took some helicopter rides in a 3 passenger (including pilot) copter...with a cabin shaped like part of a giant whisky * snifter. The pilot almost seemed to stand the helicopter on end to give us a very close up view of the president's heads...he was an excellent pilot, I was quite impressed with his skill.
It was a very good day at Mount Rushmore, a place I would recommend a visit.
* I spell it that way as I'm of part Scots ancestry