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seam mining was conducted in the East and West Pit, which are currently in reclamation <br />and two seams were mined in the Section 16 Pit, which is also in reclamation. Coal from <br />the Colowyo Mine is trucked to the Gossard Loadout and shipped to market by rail. <br />Permit History <br />Pre -startup activities for a surface mine permit commenced in the summer of 1973 and <br />Open Pit Mining Permit No. 76-15 was issued on August 31, 1976. This permit was <br />converted to Development and Extraction Mining Permit No. 76-15C/A on January 25, <br />1977. An application for Permit C-1981-019 was submitted on September 13, 1982 and <br />the permanent program permit was issued on November 4, 1982. The permit was <br />renewed on July 10, 1987 (RN -01), June 30, 1992 (RN -02), November 5, 1997 (RN -03), <br />November 5, 2002 (RN -04), October 23, 2009 (RN -05), and May 20, 2013 (RN -06). <br />MiningHrX <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- <br />1974. Surface mining operations began in 1976 and have continued uninterrupted to <br />date. Initially permitted as a single seam operation, Colowyo began its operations in the <br />East Pit, mining from north to south. The East Pit was developed as a multi -seam <br />operation (eight seams) in 1977. An eastern appendage of the East Pit, the Section 11 Pit, <br />was approved in 1991 and was later absorbed into the East Pit. Coal extraction by open <br />pit mining concluded in the East Pit in 2003 with highwall mining continuing until 2006. <br />Operations in the two -seam Section 16 Pit were initiated in 1998. The Section 16 Pit <br />mining was initially conducted from east to west but was later changed to mine from <br />north to south, as coal resources were depleted. Mining in the Section 16 Pit concluded <br />in 2002. The West Pit was developed as a multi -seam operation (eight seams) in 1998. <br />The pit progressed from north to south and active mining operations were completed in <br />2015. The South Taylor Pit was developed as a multi -seam operation (7 seams) in 2007. <br />The mining in the South Taylor Pit progresses from east to west. Coal extraction in the <br />South Taylor Pit continues to date. With the approval of Permit Revision No. 3, the <br />Collom Pit Area, located west of the South Taylor Pit, has been incorporated into <br />Colowyo's PAP. Mining operations in the Collom Pit have yet to occur and are currently <br />being revised with the pending Permit Revision No. 4. <br />Auger mining was conducted at the interface between the Section 11 Pit and East Pit <br />from 1993-1994. Highwall mining operations were conducted in the East Pit from 2004- <br />2006. Highwall mining operations were conducted in the West Pit in 2004, 2006, 2007 <br />and 2008. Highwall mining operations were conducted in the South Taylor Pit beginning <br />in 2009 and are also planned for other suitable areas as mining progresses. The use of <br />highwall mining at the Colowyo Mine has extended the economic recovery of coal <br />resources beyond the economic limits of deep -pit operations. <br />Colowyo Mine <br />Permit No. C-1981-019 <br />Section II — Revisions to Permit C-1981-019 <br />2 <br />Midterm Review No. 7 <br />June 6, 2016 <br />