FILE - In this Nov. 8, 2015, file photo, a rescue worker searches for victims next tot he carcass of a dead cow, at the site of the town of Bento Rodrigues, after two dams burst, in Minas Gerais state, Brazil. Samarco, a joint-venture of mining giants Vale and BHP Billiton, involved in Brazil's worst environmental disaster has reached an agreement on Wednesday, Feb. 17, 2016, with local government and public prosecutors to hire an independent auditor to monitor its repair work. (AP Photo/Felipe Dana, File)
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