(a) Except as provided in this section and § 971.408, the processing of hard minerals recovered pursuant to a permit shall be conducted within the U.S., provided that the President or his designee does not determine that this restriction contravenes the overriding national interests of the United States.

(b) If foreign processing is proposed, the applicant shall submit a justification demonstrating the basis for a finding pursuant to § 971.408(a)(1). The justification shall include an analysis of each factor which the applicant considers essential to its conclusion that processing at a site within the U.S. is not economically viable.

(c) If the Administrator determines that the justification provided by the applicant is insufficient, or if the Administrator receives during the public comment or hearing period what the Administrator determines to be a serious alternative U.S. processing site proposal, the Administrator may require the applicant to supply, within a specified reasonable time, additional information relevant to the § 971.408(a)(1) finding.

(d) The applicant must include in its application satisfactory assurances that such resources after processing, to the extent of the permittee's ownership therein, will be returned to the United States for domestic use if the Administrator determines pursuant to § 971.408 that the national interest necessitates such return. Assurances must include proposed arrangements with the host country.