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C-81-019 2005 Midterm Review May 5, 2005 The Colowyo Coal Company L.P. (Colowyo) operates the Colowyo Coal Mine. Acronyms Boazd Colorado Mined Land Reclamation Board Colowyo Colowyo Coal Company L.P. Division Colorado Division of Minerals and Geology MR - MinocRevision - - - PAP Permit Application Package. A set of text, drawings, maps, and exhibits, consisting often volumes, that describe mining and reclamation operations, and demonstrates compliance with the Regulations of the Colorado Mined Land Reclamation Boazd for Coal Mining Pemut A permit , C-1981-019, for mining operations, issued by the Colorado Division of Minerals and Geology. In this review, this term included the PAP and all files and reports associated with the permit. Rules Regulations of the Colorado Mined Land Reclamation Board for Coal Mining TR Technical Revision Section I - Historv of the Site Permit History Pre-startup activities for a surface mine permit commenced in the summer of 1973, and Open Mining Permit No. 76-15 was issued on August 31, 1976. This pernut was converted to Development and Extraction Mining Permit No. 76-15 C/A on January 25, 1977. An application for Permit C-019-81 was submitted on September 13, 1982 and the Permit was issued on November 4, 1982. It was renewed on August 21, 1987, November 5, 1992, November 5, 1997, and again on November 5, 2002. Mining History Underground mining in the vicinity of the current permit was started in 1914. Colowyo conducted underground mining operations (Red Wing Mine) from 1945 to 1974. Surface mining operations began in 1976 and have continued, uninterrupted, to date. Initially a single seam extraction, Colowyo began its operations in the East Pit, in a north to south orientation. Mining was deepened to 8 seams in 1977. An eastern appendage of the lazger East Pit, the Section 11 Pit, was approved in 1991, and was later absorbed into the East Pit. Coal extraction by open pit multiple-seam mining operations concluded in the East Pit in 2003. Section 16 Pit operations, open pit mining of two seams, were initiated in 1998, conducted initially from east to west, changed from north to south as the coal resources were depleted, and extraction of coal concluded in 2002. Open West Pit operations, eight seams, conducted from north to south, were initiated in 1998 and aze ongoing. Auger mining at the interface of the Section 11 and East Pits was accomplished in 1993 - 1994. Highwall mining operations were introduced in 2004 in the East Pit, were conducted also in the West Pit in 2004, and extend the recovery of coal resources beyond the economic limits of deep-pit operations at coal seam exposures.