There's plenty of examples here's a 200 MW farm for $A200 million these things usually pay for themselves in just over a decade. The mine will last for over 2 decades so there's a lot of upside to solar.
https://www.pv-magazine.com/2022/11/16/x-elio-flicks-switch-on-200-mw-solar-project-in-australia/#:~:text=The%20200%20MW%20Blue%20Grass,has%20achieved%20full%20commercial%20operations.
