This is the second in a series of three briefing papers about the potential extraction of deep-sea minerals, written for manufacturers and markets. The first paper introduces deep-sea mining and calls for responsible businesses to heighten participation in this topic. This second paper examines the applicability to deep-sea minerals of existing responsible sourcing approaches and identifies gaps and possible environmental and social risk exposure for manufacturers. The third paper will assess opportunities for manufacturers and markets to engage with regulators and other stakeholders in order to promote strong future environmental and social management systems.