458. Restrictions on rent and royalties.

Where the land comprised in a compulsory rights order1 consists of or includes land which, immediately before the operative date2 of the order, was subject to a mining lease3 or order conferring working rights4 the benefit of which is held for the purposes of a mineral undertaking, the provisions of the lease or order are modified as follows5. The provisions of the lease or order have effect subject to the limitation that the aggregate amount of the rent, royalties and other sums payable by the mineral operator6 by virtue of the lease or order for any year7 which is