Montana city nicknamed "The Richest Hill on Earth" (5)

I believe the answer is:

butte

(Other definitions for butte that I've seen before include "Hill with steeply sloping sides and flat top - town in Montana" , "American hill" , "Isolated steep-sided flat-topped hill" , "Steep sided hill" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.