Silver City, NM is not mined out yet either.
When I left that town in 1986 copper was about 47 cents per lb. about production cost.
Every time Silver City closed a mine the economy of Farmington NM would crash. There were lots of steel fabrication and machine shops that did repair on mine equipment shipped in from Silver City.
As I revisited there back in 1986, there were caravans of people leaving the 4-Corners because the jobs had vanished.
Both steel fabrication shops I had worked for in the 1970s had also closed.
COCHISE COUNT next to NM has several more mines tha could still yeild lots of Copper.