One of the characteristics of extractive industries, in the Arctic and elsewhere, is their sensitivity to fluctuations on world markets. When demand and prices are high companies expand operations and when they fall, companies tend to close extraction sites. Moreover, no ore body lasts forever. De-industrialisation poses particular challenges to communities in the Arctic, where distances are great, alternative economies few and where the environmental and social imprints of mining often are significant. How can communities that were developed based on extraction transition to post-extraction futures? This is a key question to pose when exploring how to achieve responsible development in the Arctic. This book chapter presents research within REXSAC exploring how mining communities in the Nordic Arctic has dealt with legacies of past mining operations and under which circumstances such legacies have been ascribed new values after extraction has ended. REXSAC has dealt with this research problem in an interdisciplinary way, combining methods and approaches from humanities, social- and natural sciences. The chapter will focus on this process of research and how it has generated insights in to three main post-extraction processes: environmental remediation, heritage making and re-economization.