The Oyu Tolgoi Investment Agreement and companion Shareholders' Agreement establish the framework for the development and operation of the Oyu Tolgoi copper-gold mine. The Investment Agreement, signed in 2009, has an initial 30-year term with a 20-year extension. In 2015, the Oyu Tolgoi Underground Mine Development and Financing Plan was signed to set out an agreed basis for the funding of the project

Detailed information can be found in copies of the agreements, below.