Within one year after
June 28, 1980, the Secretary of State shall, in cooperation with the Administrator and as part of the international consultations pursuant to
section 1428(f) of this title, negotiate with all nations that are identified in such subsection for the purpose of establishing international stable reference areas in which no mining shall take place:
Provided, however, That this subsection shall not be construed as requiring any substantial withdrawal of deep seabed areas from deep seabed mining authorized by this chapter.