BHP Billiton and Rio Tinto are being forced to spend $US3.4 billion ($3.67 billion) on a water plant at their copper project in Chile, at a time when mining companies globally are curtailling capital spending.
The two miners will lose access to most of their water supply at the Escondida project, the world’s largest copper mine, in 2017.
BHP’s share of the new round of investment is estimated at $US1.97 billion and Rio’s at $US1.03 billion. Construction on the planned desalination plant is to start immediately, with completion planned for 2017.
The partners are in the middle of a $US4.5 billion round of spending which is to be completed next year, primarily on a new ore concentrator at the project, together with ancillary upgrades.
When completed, these upgrades will enable the production of more than 1.3 million tonnes of copper a year from 2015.
When the partners in Escondida disclosed the $US4.5 billion upgrade early last year, they signalled this was the first in a series of programs that could substantially expand capacity at the mine.