The United Nations Framework Classification for Resources (UNFC) is an international system for classifying minerals and energy resources. This document specifies the UNFC terminology and principles to enable its application to Anthropogenic Resources. Anthropogenic Resources can be found in a variety of sources, including: mine tailings, buildings, infrastructure, consumer goods, and from all the material life cycle stages, including production, use and end-of-life. Therefore, the Specifications will help to manage recovery projects in the circular economy. The United Nations Economic Commission for Europe (ECE) and the Expert Group on Resource Classification encourage governments, regulators, industry and universities to apply these Specifications for developing case studies. The Expert Group will welcome a fruitful cooperation to boost circular economy in alignment with the 2030 Agenda for Sustainable Development. This document was approved by the Expert Group on Resource Classification at its ninth session, 24-27 April 2018 and endorsed by the ECE Committee on Sustainable Energy at its twenty-seventh session, 27 September 2018. The document has been prepared by the Working Group on Anthropogenic Resources, as mandaded by the UNECE Expert Group on Resource Classification in cooperation with the COST Action Mining the European Anthroposphere.