30 U.S.C. § 213 : US Code - Section 213: Royalties for use of deposits of silica, limestone, or other rock embraced in lease

Search 30 U.S.C. § 213 : US Code - Section 213: Royalties for use of deposits of silica, limestone, or other rock embraced in lease

Any lease to develop and extract phosphates, phosphate rock, and
associated or related minerals under the provisions of sections 211
to 214 of this title shall provide that the lessee may use so much
of any deposit of silica or limestone or other rock situated on any
public lands embraced in the lease as may be utilized in the
processing or refining of the phosphates, phosphate rock, and
associated or related minerals mined from the leased lands or from
other lands upon payments of such royalty as may be determined by
the Secretary of the Interior, which royalty may be stated in the
lease or, as to the leases already issued, may be provided for in
an attachment to the lease to be duly executed by the lessor and
the lessee.