This book provides a diplomatic history of a turning point in Antarctic governance: the 1991 adoption of comprehensive environmental protection obligations for an entire continent, which prohibited mining. Solving the mining issue became a symbol of finding diplomatic consensus. The book combines historiographic concepts of contingency, conjuncture and accidental events with theories of structural, entrepreneurial and intellectual leadership. Drawing on archival documents, it shows that Antarctic governance is more adaptive than some imagine, and policy success depends on the interplay of normative practices, serendipitous events, public engagement and influential players able to exploit those circumstances. Ultimately, the events revealed in this book show that the protection of the Antarctic Treaty itself remains as important as protecting the Antarctic environment.