Net proceeds will go toward settling up two revolving credit facilities drawn in connection with the company's acquisition of mining and exploration company Equinox Minerals in 2011.

The 95% stakeholder in the Papua New Guinea's giant Porgera mine said the debt notes would be priced in two parts including $1.25 billion at 3.85% interest due in 2020 and $750 million at 5.25% interest due in 2042.

Remaining proceeds will be applied to the development of mining projects and general corporate purposes.