Oct. 26 (UPI) -- Two international mining corporations have finalized a $30 billion settlement with the Brazilian government over a deadly dam collapse in 2015 that remains the worst environmental disaster in the country's history. Brazil-based mining company Vale and Australian firm BHP signed the deal Friday during an event attended by Brazilian President Luis Inacio Lula da Silva . Advertisement The dam collapse killed 19 people and left hundreds of others homeless in Mariana, Brazil, a city