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-1- <br />IV. Geology - Rule 2.09.5 and 2.09.6(1) <br />The geology sections of the permit application can be found in Volume I, <br />pages 2.04-11 through 2.04-30. Additional overburden analyses were <br />submitted on September 30, 1982 and October 7, 1982. Geologic Maps and <br />cross-sections for the permit and adjacent areas are in Volume <br />Maps 5 and 6. <br />The rocks exposed in the general area of the Colorado Coal Mine No. 1 <br />consist of Tertiary and Cretaceous aged sedimentary rocks and Tertiary <br />volcanic intrusive rocks. The sedimentary rocks are divided into the <br />Tertiary aged Poison Canyon Formation and Raton Formations and the Late <br />Cretaceous aged Vermejo Formation, Trinidad Formation and Pierre Shale. <br />All of the coal seams rahich will be mined are contained in the Vermejo <br />Formation. The six minable coal seams in the Vermejo Formation are <br />Upper Robinson, Lower Robinson, Pryor, Walsen, Lennox, and Cameron. <br />The volcanic sills, dikes and plugs have locally coked and coals inplace. <br />The Walsenburg Coal Field is located on the northeastern edge of the <br />0 <br />Raton Structural Basin. The coal beds in the permit area strike N 20 W <br />and dip 2 to 5 degrees to the west-southwest. Several normal faults with <br />low displacement transect the permit area. <br />Thirteen inactive underground coal mines are located within and adjacent <br />to the Colorado Coal Mine No.l permit area. The workinys of these mines <br />are within the Lower Robinson Lennox and Cameron coal seams (Table 2, <br />volume I). These coal seams and their associated roof and floor strata <br />are toxic. The toxic nature of these strata is evident from Z) the lack <br />of vegetative cover on oId coal refuse piles, 2) the toxic and degraded <br />ground water quality of water in flooded mine workings, and 3) the <br />overburden analyses submitted by the applicant. Further discussion of <br />overburden toxicity is contained in the sections of this permit document <br />titled "Backfill and Grading", and "Hydrologic Balance - Ground Water". <br />The Division Finds that the applicant has submitted sufficient geologic <br />information to be in conformance with Rules 2.09.5 and 2.04.6(1). <br />