This Free the Slaves field investigation was conducted to document the types, nature and scale of slavery at major mining sites in South Kivu province; to analyze the characteristics that cause Congolese workers to be vulnerable to enslavement; and to recommend solutions. The survey team findings are valuable information for a wide variety of actors working to improve the status of human rights in eastern DRC, including those focused on human trafficking, “conflict minerals,” child rights, gender-based violence and rural poverty.