30 U.S.C. § 213 — Royalties for use of deposits of silica, limestone, or other rock embraced in lease

This section is a single, undivided rule. It applies to any lease made under sections 211 to 214 of this title to develop and extract phosphates, phosphate rock, and related minerals. Such a lease must include a provision letting the lessee use silica, limestone, or other rock deposits located on the public land covered by the lease. The lessee may use that rock in processing or refining the phosphates, phosphate rock, or related minerals — whether those minerals were mined from the leased land itself or from other land. In exchange, the lessee must pay a royalty for using the rock, in an amount the Secretary of the Interior determines. That royalty may be written directly into the lease or, for leases already issued, added through a separate attachment that the lessor and the lessee both sign.