pay nearly $30bn (£23bn) in compensation for the Mariana dam collapse in 2015 that caused the country's worst environmental disaster.
Brazilian President Luis Inacio Lula da Silva attended the signing of the deal on Friday.
The dam collapse released toxic waste and mud, which flooded nearby towns, rivers and forests.
It killed 19 people, left hundreds others homeless, and poisoned the river.
President Lula said: "I hope the mining companies have learned their lesson; it would have cost them less to prevent the disaster."
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