From pv magazine LatAm
Chilean energy company Guacolda Energía has finished building a 3 MW solar plant on a tailings dam in Tierra Amarilla, in the sunny Atacama region in northern Chile.
The $3 million project is located on a 4.5-hectare plot of land. The energy it generates will be used for the mining operations of Chilean company Pucobre. René Opazo, operations manager for Guacolda Energía, described the installation as “a milestone for more sustainable mining.”
Tailings dams are earth-fill embankment dams that store the byproducts of mining operations, such as ground rocks, water, and gangue minerals.
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I don`t think that it is the world’s first solar project to be built on a tailings dam. In Bulgaria we have some for at least 10years which are build at tailing dams. You can check the links:
https://goo.gl/maps/hSvcPb1ENYH5XnqQ7
https://goo.gl/maps/K16YLv2s1Q2eLHiu8
https://goo.gl/maps/UuPPfbi3JdkwcCNL8