...Samarco Mineracao S.A.'s (Samarco) `Restricted Default' (RD) ratings are driven by the nonpayment of its financial obligations following its tailings dam accident. These nonpayments include interest due on its USD1 billion senior unsecured notes due 2022, its USD700 million senior unsecured notes due 2023 and its USD500 million senior unsecured notes due 2024....