This report offers an in-depth critique of company complaints mechanisms as practised by two extractive industry companies Acacia Mining (formerly African Barrick Gold, ABG) operating in Tanzania and Glencore’s subsidiary, the Kamoto Copper Corporation (KCC), in the Democratic Republic of the Congo (DRC)...Both companies have explicitly endorsed the UN Guiding Principles on Business and Human Rights (‘GPs’) and adhere to the Voluntary Principles on Security and Human Rights (‘VPs’)...In its analysis, RAID breaks down the GPs’ framework, by which companies demonstrate their respect for human rights, into four steps: endorse-assure-manage-remedy...The report also considers the effectiveness of the VPs under the same four steps, since efforts are on-going to fully align them with the GPs...RAID concludes that both sets of principles are a pragmatic solution for companies to consider and manage the human rights impact of their operations, but they do not necessarily offer a solution that brings fair settlement or justice to the victims of abuses.