You're kidding, right?
I know you're not kidding!
Search a bit for more pictures of Itaipu Dam or Tucuruí Dam, some of the top largest hydroelectric power stations and you won't see any mountains around. As for the drought rivers, eh!
Yeah, except that in practice, when you need 24/7 all year long cheap electricity and you're not receiving thousands of dollars in government incentives nuclear and dirty old coal-generated electricity beats the crap out of any solar-generated electricity.
That's why without proper government cash and solar feed-in grid tariff plans nobody would even dare to mine with solar, or if they are doing it they don't realize how much they are losing or are going to.