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4.0 Description of the Environment <br /> 4.1 Maps <br /> United States Geological Survey (USGS) Topographic Map 7.5 Minute Quadrangles, Axial and <br /> Ninemile Gap, Colorado, cover the area of the permit. <br /> 4.2 General, Disturbed and Affected Area <br /> The Mine is located approximately 28 miles southwest of Craig, Colorado, near State Highway <br /> 13. The majority of the permit area and current operations (including the mine pits, the <br /> administrative office, shops, warehouses, general offices and a rail loadout facility) are located in <br /> Moffat County. Approximately 1,000 acres of the South Taylor Pit, approved in PR-02, is <br /> located in Rio Blanco County. All of the coal currently mined in the South Taylor Pit is in Rio <br /> Blanco County. With the approval of PR-04, Colowyo has begun mining operations within the <br /> Collom Pit. All disturbance actives are limited to the approved information provided in Exhibit <br /> 13C of the Colowyo PAP. <br /> Colowyo owns approximately 83 percent of the surface acreage of the current permit area. An <br /> additional 13 percent(approximate)is Federal land managed by the BLM, and the remaining <br /> four percent is State of Colorado land. The mine operation consists of several pits operating <br /> within 26,173 permitted acres. <br /> 4.3 Coal Resources to be Mined <br /> Eight major coal seams were mined in the East Pit, West Pit and Section 16 Pit at the Mine. <br /> These are the "Y", "X," "A", "B", "C", "D", "E" and "F" seams. The seams vary in thickness <br /> from 2.5 feet to 15 feet, and overburden thickness varies as a function of structural geology and <br /> topography. <br /> In the South Taylor mining area, 17 seam and sub-seam complexes are mined. The seams are <br /> the "A", "B", "C", "D", "E", "F" and "G" seams and their seam complexes (for example, the G- <br /> Seam is separated into G7, G8 and G9 in the South Taylor Area). The seams vary in thickness <br /> from 1.5 feet to 17 feet and the overburden and interburden thicknesses vary, on average, from 2 <br /> feet to 65 feet. Figure 2.04.E-313 in the PAP contains a generalized diagram of the seams to be <br /> mined as well as the overburden and interburden. <br /> Seems to be mined in the Collom Pit include the "Y" "Y' "A" "B" "C" "E" "F", and "G". <br /> The lowermost seam planned for development is the G(ab). Figure 2.04.6 of the PAP shows the <br /> geologic cross-sections and dip of all the coal seams to be mined. Cross section locations are <br /> shown on Map 11B of the PAP. <br /> 4.4 Topography <br /> Proposed Decision and Findings of Compliance January 5,2023 <br /> Permit Renewal No. 8 Page 116 <br />