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<br />-12- <br />of "no effect" or "no adverse effect" from the Colorado SHPO for each eleigble <br />site. For each site that a determination of "no effect" or "no adverse <br />effect" cannot be made, the permittee will prepare and submit to the Division <br />and OSM a site specific plan for mitigating damage to the sites resulting from <br />the adverse effects of surface subsidence. This plan will be approved by the <br />Division and OSM prior to conducting any underground mining within Federal <br />Coal Lease C-8424. The approved plan will be submitted in a form which can be <br />inserted into the permit application. <br />Pursuant to Rule 2.07.6(2)(e), the Division finds the permittee will not <br />adversely affect any publicly owned park or place listed in the National <br />Register of Historic Places. The operation is in compliance with the <br />requirements of this section. <br />IY. Geology - Rules 2.04.5, 2.04.6(2) <br />The permittee has provided a description of the geology of the permit and <br />adjacent areas in Section II. B. of Volume 1 and on Map 4 of Volume 5 of the <br />permit application. This information has been reviewed by the Division to <br />determine compliance with the Colorado Rules and Regulations. <br />All mining and related mining activity associated with the Deserado Mine will <br />be performed within the Mesaverde Group. The carbonaceous zone containing the <br />coal beds of interest occupies the basal 200 to 300 feet of the Lower Williams <br />Fork Formation. The B and D coal seams are contained in a 25- to 50-foot <br />interval occurring 10 to 40 feet above the top of the B Horizon sandstone. <br />Although coals are prevalent throughout the rest of the carbonaceous zone, <br />they are commonly too thin or of too little lateral extent to be considered <br />mineable. <br />Westen Fuels' 1978 drilling program identified nine coal seams traceable <br />throughout all or part of the mine permit area. These nine seams occur in the <br />basal 200 to 300 feet of the lower Williams Fork Formation. The lithology of <br />the coal bearing zone is predominately siltstone, shale, carbonaceous shale <br />and coal interbedded with thin, discontinous, often calcareous sandstone <br />units. The siltstones and sandstones commonly contain abundant carbonaceous <br />material. The lower limit of the zone is marked by the B Horizon sandstone. <br />The underlying Iles Formation is characterized by thick (20 to 40 feet) <br />sandstones and occasional very thin carbonaceous shales or coals. The <br />interval of the Upper Williams Fork Formation overlying the coal bearing zone <br />is characterized by a marked change to coarser grained sediments. Very thick, <br />continuous, occasionally silty sandstone units are predominant. Coals, where <br />present, are thin ( 1.0 foot or less) and laterally discontinuous. <br />The nine coal seams have been labelled A, B, C, D, E, F, G, Hand J in <br />ascending order. Two typical cross sections are presented in Figure II.B-2 of <br />Volume 1 of the application. Additional cross-sections for new Federal Lease <br />areas are provided in Illustration 36, 37 and 38, within Volume 12 of the <br />application. <br />Geochemical and physical analyses of the roof, floor and coal for both the B <br />and D seams are provided at the end of Section II.B. in Volume 1 of the permit <br />application. Sample cores of two feet of roof rock and one foot of floor rock <br />were described and analyzed separately for each of four core holes drilled <br />within Federal Coal Lease C-023703. Due to the proximity of the sampled core <br />