other documents that relate to compliance with any provision of this section by any person. (g) Cooperative agreements (1) In general The Secretary is authorized to enter into cooperative agreements with the Secretary of Agriculture to share information concerning the royalty management of hardrock minerals, concentrates, or products derived therefrom to carry out inspection, auditing, investigation, or enforcement (not including the collection of royalties, civil or criminal penalties, or other payments) activities under this section, and to carry out any other activity described in this section. (2) Secretary of Agriculture Except as provided in paragraph (3), and pursuant to a cooperative agreement entered into under paragraph (1), the Secretary of Agriculture shall, upon request, have access to all royalty accounting information in the possession of the Secretary with respect to the production, removal, or sale of hardrock minerals, concentrates, or products derived therefrom from claims or leases on land open to mineral exploration and production under this Act. (3) Confidential information (A) In general Trade secrets, proprietary information, and other confidential information protected from disclosure under section 552 of title 5, United States Code, shall be made available by the Secretary to other Federal agencies as necessary to ensure compliance with this Act and other Federal laws. (B) Protection of information The Secretary, the Secretary of Agriculture, and other Federal officials shall ensure that the information described in subparagraph (A) is provided protection in accordance with the requirements of that section. (h) Interest and substantial underreporting assessments (1) Payments not received (A) In general In the case of mining claims or leases where royalty payments are not received by the Secretary on the date that such payments are due, the Secretary shall charge interest on such underpayments at the same interest rate as the rate applicable under section 6621(a)(2) of the Internal