; and (ii) to require coal mining operations covered by a self-bond accepted by the State regulatory authority prior to the date of enactment of this subsection to replace the self-bond with another form of bond acceptable under this section by not later than the earlier of— (I) the date of renewal of the permit under section 506(d); and (II) the date of any major permit modification under section 506. (g) Bonds issued by surety (1) In general Not later than 1 year after the date of enactment of this subsection, the Secretary shall issue rules establishing limitations on surety bonds accepted under this section to minimize the risk of financial liability to the Federal Government or a State government, including rules regarding— (A) the maximum quantity of corporate surety bonds issued by any 1 corporate surety as a percentage of the total quantity of coal mine reclamation bonds in any 1 State; (B) the minimum percentage of surety bonds unrelated to activities regulated pursuant to this Act required to reinsure corporate surety bonds; (C) the minimum collateralization required for corporate surety bonds; and (D) the minimum amount of cash assets required to be held by a corporate surety as a percentage of coal mine reclamation bonds issued by the corporate surety. (2) Existing corporate bonds Corporate surety bonds in existence on the date of enactment of this subsection must be modified or replaced as necessary by not later than 1 year after the date on which the rule is issued under paragraph (1). (h) Collateral requirements Real property posted as collateral for a bond may not include— (1) coal; (2) a coal mine; (3) land that includes a coal mine; (4) land that is located above a coal mine; (5) a coal processing facility; (6) a coal waste disposal site; (7) coal mining equipment unlikely to retain salvage or resale value