“Structural projects,” which the company hopes will counteract a drop in ore grades of its deposits, are key to maintaining copper production in the coming years.
The surge came from the nearby Conchas Norte mine, which closed due to flooding in 1996 and has since accumulated nearly 2 million cubic metres of water.
Brazil's comptroller general decided the miner failed to present reliable information on the conditions of the tailings dam prior to the 2019 disaster.
Mining companies around the world are turning to new technologies to extract more from current operations as new deposits become pricier and trickier to find and develop.