This book is a sequel toDeep-Sea Mining: Resource Potential, Technical and Environmental Considerations (2017) and Environmental Issues of Deep-Sea Mining: Impacts, Consequences and Policy Perspectives (2019), and aims to provide a comprehensive volume on different perspectives of deep-sea mining from specialists around the world. The work is timely, as deep-sea mineralscontinue to enthuse researchers involved in activities such as ascertaining their potential as alternative sources for critical metals for green energyand other industrial applications, as well as technology development for their sustainable exploration and exploitation, while addressing environmental concerns.With a steady increase in the number of contractors having exclusive rights over large tracts of seafloor in the Area, i.e. area beyond national jurisdictions, the International Seabed Authority, mandated with the responsibility of regulating such activities, is in the process of developing a code for exploitation of deep-sea minerals. These, coupled with growing interest among private entrepreneurs, investment companies and policy makers, underscore the need for updated information to be made available in one place on the subject of deep-sea mining. The book evaluates the potential and sustainability of mining for deep-sea minerals compared to other land-based deposits, the technologies needed formining andprocessingof ores, the approach towardsenvironmental monitoring and management,as well asthe regulatory frameworks and legal challenges to manage deep-sea mining activities. The bookis expected to serve as an important reference for all stakeholders including researchers, contractors, mining companies, regulators and NGOs involved in deep-sea mining.