Part XI of the United Nations Convention on the Law of the Sea (UNCLOS), adopted in 1982, establishes the legal regime for "the Area" — the seabed, ocean floor, and subsoil beyond the limits of national jurisdiction. Its foundational principle, set out in Article 136, declares the Area and its resources the common heritage of mankind, meaning no state may claim sovereignty over any part of it and its mineral resources must be managed for the benefit of humanity as a whole, with particular regard to developing states.
Part XI created the International Seabed Authority (ISA), headquartered in Kingston, Jamaica, to organize and control activities in the Area, especially mineral exploration and exploitation (polymetallic nodules, sulphides, and cobalt-rich crusts). It also established the Enterprise, an operational arm intended to conduct mining on behalf of the ISA, and a parallel system allowing both state-sponsored private contractors and the Enterprise to mine.
The original Part XI provisions — including mandatory technology transfer, production limits, and a strong redistributive mandate — were rejected by the United States, the United Kingdom, Germany, and other industrialized states, which refused to sign UNCLOS in 1982. To resolve the impasse, the 1994 Agreement Relating to the Implementation of Part XI substantially renegotiated the regime: it weakened mandatory technology transfer, subjected the Enterprise to market principles, and gave industrial states stronger voting weight in the ISA Council. The 1994 Agreement and Part XI are now interpreted together as a single instrument.
Contemporary disputes under Part XI focus on deep-sea mining. After Nauru triggered the "two-year rule" in 2021, the ISA has faced pressure to finalize the Mining Code. States including France, Germany, Chile, and Palau have called for a moratorium or precautionary pause, while sponsoring states such as Nauru and contractors like The Metals Company push for commercial extraction to begin.
The United States, despite signing the 1994 Agreement, has still not ratified UNCLOS.
Example
In July 2023, the International Seabed Authority Council met in Kingston to negotiate exploitation regulations under Part XI after Nauru's 2021 notification triggered a deadline for adopting the Mining Code.
Frequently asked questions
The Reagan administration objected to mandatory technology transfer, production controls, and a redistributive seabed regime it viewed as incompatible with free-market principles. Although the 1994 Agreement addressed most US concerns, the Senate has still not given advice and consent to ratification.
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