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Mountain Coal Co. submitted the application for PR-12, addition of the Dry Fork lease ( COC- • <br />67232), on October 1, 2007 and DRMS found the application complete on the same day. An <br />adequacy review was conducted and comments were submitted to the applicant in a letter dated <br />December 5, 2007. Adequacy concerns were related to subsidence impacts in the proposed Dry <br />Fork lease area and various changes to text and tables in the permit application. All concerns <br />were resolved by Mountain Coal's responses submitted on February 28, 2008. <br />Operations at the West Elk Mine (WEM) have been conducted under several different names in <br />the past. Before 1991, the WEM itself was known as the Mt. Gunnison No. 1 Mine. Since the <br />mine opened, operations were conducted under the following names: Anaconda Minerals <br />Company, ARCO Coal Company (a Division of Atlantic Richfield Company), and West Elk <br />Coal Company, Inc. The name was changed from West Elk Coal Company, Inc., Mt. Gunnison <br />No. 1 Mine, to Mountain Coal Company, West Elk Mine, and processed by the Division as a <br />Succession of Operator. Both companies are wholly owned subsidiaries of the Atlantic Richfield <br />Company. The Division issued a proposed decision to approve the name change pursuant to <br />Rule 2.08.6(4) on December 20, 1991. The decision was final following the public comment <br />period, on January 20, 1992. The permit was subsequently transferred by succession of operator <br />to Mountain Coal Co. LLC, a subsidiary of Arch Coal, Inc., on April 23, 1998. <br />• <br />• <br />79