On December 1, 2016, following decades of inaction and a court order establishing a deadline by which the proposed rule was to be released, the United States Environmental Protection Agency (“EPA”) announced that it would publish a proposed rule regulating financial assurances required for parties conducting remediation projects in the hardrock mining industry. Section 108(b) of the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”) directed EPA to develop rules requiring “that classes of facilities establish and maintain evidence of financial responsibility consistent with the degree and duration of risk associated with the production, transportation, treatment, storage, or disposal of hazardous wastes.” 42 U.S.C. 9608(b)(1). Although these rules were required to be promulgated by 1985, EPA never published any rules, which led to a deadline of December 1, 2016 being set by court order in response to a lawsuit complaining that EPA failed to comply with the statute. See In re Idaho Conservation League, 811 F.3d 502 (D.C. Cir. 2016). In the absence of such rules, EPA required financial assurance through negotiated settlements, orders, and guidance.