There is a mine in chile that does something similar with conveyor belts. The mine is in the Andes mountains, 3200 meters above sea level; the belts go downhill

There is a mine in chile that does something similar with conveyor belts. The mine is in the Andes mountains, 3200 meters above sea level; the belts go downhill for 10kms to 1800 masl. They have most of their VFDs in regenerative mode, ultimately generating 25mw wich they end up selling to the interconnected grid.