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Permit History <br /> Pre-startup activities for a surface mine permit commenced in the summer of 1973 and Open <br /> Pit Mining Permit No. 76-15 was issued on August 31, 1976. This permit was converted to <br /> Development and Extraction Mining Permit No. 76-15C/A on January 25, 1977. An <br /> application for Permit C-1981-019 was submitted on September 13, 1982 and the permanent <br /> program permit was issued on November 4, 1982. The permit was renewed on July 10, 1987 <br /> (RN-01), June 30, 1992 (RN-02),November 5, 1997(RN-03), <br /> November 5,2002 (RN-04), October 23, 2009(RN-05), May 20,2013(RN-06), August 14, <br /> 2018(RN-07), and February 25,2023 (RN-08). <br /> MiningHry <br /> Underground mining activities in the vicinity of the current permit were started in 1914. <br /> Colowyo conducted underground mining operations at the Red Wing Mine from 1945- 1974. <br /> Surface mining operations began in 1976 and have continued uninterrupted to date. Initially <br /> permitted as a single seam operation, Colowyo began its operations in the East Pit, mining <br /> from north to south. The East Pit was developed as a multi-seam operation(eight seams) in <br /> 1977. An eastern appendage of the East Pit,the Section 11 Pit, was approved in 1991 and was <br /> later absorbed into the East Pit. Coal extraction by open pit mining concluded in the East Pit <br /> in 2003 with highwall mining continuing until 2006. Operations in the two-seam Section 16 <br /> Pit were initiated in 1998. The Section 16 Pit mining was initially conducted from east to <br /> west but was later changed to mine from north to south, as coal resources were depleted. <br /> Mining in the Section 16 Pit concluded in 2002. The West Pit was developed as a multi-seam <br /> operation (eight seams) in 1998. The pit progressed from north to south and active mining <br /> operations were completed in 2015. The South Taylor Pit was developed as a multi-seam <br /> operation(7 seams) in 2007. Mining operations in the South Taylor Pit concluded in 2023. <br /> Coal extraction in the South Taylor Pit continues to date. With the approval of Permit <br /> Revision No. 4,the Collom Pit Area, located west of the South Taylor Pit, has been <br /> incorporated into Colowyo's Permit Application Package (PAP). Mining operations in the <br /> Collom Pit began in 2016 and is progressing from the north to the south. The Collom Pit is <br /> developed as a multi-seam operation (8 seams). <br /> Auger mining was conducted at the interface between the Section 11 Pit and East Pit from <br /> 1993-1994. Highwall mining operations were conducted in the East Pit from 2004-2006. <br /> Highwall mining operations were conducted in the West Pit in 2004, 2006, 2007 and 2008. <br /> Highwall mining operations were conducted in the South Taylor Pit beginning in 2009 through <br /> 2023. Highwall mining is currently being conducted in the Collom Pit. T h e use of highwall <br /> mining at the Colowyo Mine has extended the economic recovery of coal resources beyond the <br /> economic limits of deep-pit operations. <br /> Colowyo Mine Midterm Review No.8 <br /> Permit No.C-1981-019 May 5,2020 <br /> 3 <br />