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The West Pit is located to the west of the East Pit. The method of operation utilized in, and the coal <br /> seams extracted from,the West Pit were the same as those of the East Pit. The West Pit was roughly the <br /> same overall size as the East Pit. Mining in the West Pit advanced from the north to south, paralleling <br /> the movement of the adjacent East Pit. Mining operations in the West Pit were completed in 2015. <br /> Reclamation activities remaining in the West Pit include backfilling, grading, reduction of the highwall, <br /> and vegetation. <br /> Colowyo is continuing to perform reclamation maintenance and activities in the East Pit and West Pit. <br /> Reclamation in the East Pit and West Pit is expected to conclude in 2032 with associated parcels <br /> related to the remaining in-pit haul road. <br /> Operations in the South Taylor Pit began after the approval of PR-02 in 2007. This pit is located north <br /> and west of the northward flowing Good Spring Creek and southwest of the West Pit. It lies partially in <br /> Rio Blanco County. In the South Taylor Pit, 17 seam and sub-seam complexes are mined. The seams <br /> are the A,B, C, D, E, F and G seams and their seam complexes(for example,the G-Seam is separated <br /> into G7, G8 and G9 in the South Taylor Area). At the peak of operations,the South Taylor Pit will be <br /> nearly 4,000 feet wide, 6,000 feet long, and 550 feet deep. Pit progression is from east to west. Mining <br /> within the South Taylor Pit concluded in 2023 including highwall mining operations. Reclamation in <br /> the South Taylor Pit is expected to conclude in 2031 as shown on Map 29 of the Colowyo PAP. <br /> In 2017, construction began for the Collom Pit expansion approved with PR-04. Accessible seams at <br /> the Collom Pit include the Y, X,A,B, C, E,F, and G. It is estimated that coal production from the <br /> Collom Pit will range from 1.2 to about 2.4 million tons per year based on pit progression and market <br /> needs. Mining methods at the Collom Pit will include a combination of dragline,truck/shovel and <br /> highwall mining operations. Current activities are limited to activities outlined in Exhibit 13C - Collom <br /> Cumulative Bond Schedule of the Colowyo PAP. <br /> Permit,Performance Bond,and Bond Release History <br /> The permanent program mining permit was issued on November 4, 1982. Eight successive permit <br /> renewals have been approved subsequent to the initial permanent program permit approval;the most <br /> recent, Permit Renewal No. 8, was issued February 25, 2023, for a permit term that will expire <br /> November 5,2027. The Division currently holds a reclamation bond,in the form of a corporate surety, <br /> in the amount of$126,500,000.00. Colowyo has applied fortwenty-four previous bond releases: <br /> Previous Bond Release Summary <br /> Bond Release Phase Submittal Approval Date <br /> Date <br /> SL-01 I and II 7/2/1987 10/8/1987 <br /> SL-02 I 9/25/1997 4/27/1998 <br /> SL-03 II 9/26/2000 8/15/2001 <br /> SL-04 I and II 6/l/2001 7/25/2001 <br /> SL-05 III 6/28/2010 7/25/2012 <br /> SL-06 I 4/26/2012 4/9/2013 <br /> SL-07 I 4/2/2013 8/29/2013 <br /> Proposed Decision and Findings of Compliance <br /> Partial Phase I,II and III Bond Release SL-25 Page 4 of 14 <br />