The clean-up of 24 abandoned uranium mine sites on the Navajo Nation are set to move forward with the signing of the Addendum 2 under the 2016 Phase 2 Settlement Agreement between the United States and the Navajo Nation which provides funding and resources for the clean-up of 30 abandoned mine sites in total.The clean-up of 24 abandoned uranium mine sites on the Navajo Nation are set to move forward with the signing of the Addendum 2 under the 2016 Phase 2 Settlement Agreement between the United States and the Navajo Nation which provides funding and resources for the clean-up of 30 abandoned mine sites in total.