The Secretary is authorized to and shall issue separate regulations according to time schedules established in this chapter for anthracite coal surface mines, if such mines are regulated by environmental protection standards of the State in which they are located. Such alternative regulations shall adopt, in each instance, the environmental protection provisions of the State regulatory program in existence on August 3, 1977
, in lieu of sections 1265
of this title. Provisions of sections 1259
of this title are applicable except for specified bond limits and period of revegetation responsibility. All other provisions of this chapter apply and the regulation issued by the Secretary of Interior for each State anthracite regulatory program shall so reflect: Provided, however
, That upon amendment of a State’s regulatory program for anthracite mining or regulations thereunder in force in lieu of the above-cited sections of this chapter, the Secretary shall issue such additional regulations as necessary to meet the purposes of this chapter.