Although companies cannot be a party to a treaty, the countries in which they operate can be. The treaties that a country is party to illustrate the commitment they have made to protect various human rights while also holding the country to certain ethical standards. While not required, it is good practice of extractive companies to ensure their actions meet the standard set forth by various treaties. 

The Indigenous and Tribal Peoples Convention, 1989 (No. 169)

This treaty is the only international treaty open for ratification that deals exclusively with the rights of these peoples. A country's ratification and adherence to this treaty shows the importance placed on the rights of Indigenous Peoples in their country, assuming the acts outlined by the treaty are upheld. 

View this Handbook produced by the International Labor Office to help understand this treaty. 

International Covenant on Economic, Social and Cultural Rights, 1966

This treaty commits its parties to work toward implementing and upholding economic, social, and cultural rights for all. 

View this Toolkit for Action to understand further this treaty and how a country should implement it. 

International Covenant on Civil and Political Rights, 1966

The ICCPR is a treaty placing extreme importance on civil and political rights; importantly, Article 1 articulates the right to Free, Prior, and Informed Consent, which affords Indigenous Peoples the right to be fully informed of any activities undertaken on their land, before commencing the activity.