Terraced open pit mines and rice paddies require an enormous amount of maintenance. The terraces are not naturally stable. Rice paddies will quickly silt-up, then flood and collapse in heavy rain.

Open pit mines will fill with water. The sides will collapse. In the desert, they will fill with dust. Deserts often have flash-floods following thunderstorms. They might remain recognizable as hollows, but not much more.

The Bingham mine has had collapses in 2013 and 2021:

https://blogs.agu.org/landslideblog/2021/06/04/2021-bingham-...

https://blogs.agu.org/landslideblog/2013/04/30/analysing-the...

https://blogs.agu.org/landslideblog/2013/05/06/analysing-the...

There was a similar collapse recently at the Çöpler Mine in Turkey...

https://eos.org/thelandslideblog/copler-mine-1

https://eos.org/thelandslideblog/copler-mine-2

https://eos.org/thelandslideblog/copler-mine-3

https://www.youtube.com/watch?v=SUD0hQjueI0

https://www.youtube.com/watch?v=SCRTwnz3_oo