Liability under a surface coal mining bond shall be for the duration of the surface coal mining and reclamation operation and for a period coincident with the operator's responsibility for revegetation requirements. The bond shall be executed by the operator and a corporate surety licensed to do business in Oklahoma, except that the operator may elect to deposit cash, negotiable bonds of the United States Government or of Oklahoma, negotiable certificates of deposit of any bank organized or transacting business in the United States, Certificates of Deposit or irrevocable letters of credit from a bank or lending institution licensed to do business in the State of Oklahoma. The cash deposit or market value of such securities shall be equal to or greater than the amount of the bond required for the bonded area.
Okla. Stat. tit. 45, § 745.6