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2010-02-18_PERMIT FILE - C1980007
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2010-02-18_PERMIT FILE - C1980007
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Last modified
8/24/2016 3:59:44 PM
Creation date
3/18/2010 3:37:35 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
2/18/2010
Doc Name
Federal Coal Exploration Plan Dry Fork Area
Section_Exhibit Name
Exhibit 80 Drilling Activities - MR361
Media Type
D
Archive
No
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• The general stratigraphy of the area consists of members of the Mesa Verde Formation of the <br />Upper Cretaceous System underlying the Wasatch Formation of Tertiary Age (see Figure 2). The <br />Barren Member of the Mesa Verde formation crops out lowest in the exploration area with the <br />overlying Ohio Creek member exposed along many of the steeper slopes. Above the Mesa Verde, <br />rocks of the Wasatch Formation are exposed. Capping most of the higher terrains are colluvial <br />deposits. The Upper and Lower Coal Members of the Mesa Verde Formation are the major coal - <br />bearing units in the area. The A (King), B (Somerset), and C (Bear) coal beds of the Lower Coal <br />Member and the D (Oliver), E (Hawks Nest), and the F -Seam coal beds of the Upper Coal <br />Member have all been mined within the North Fork Valley. The extent of these coal beds beneath <br />the exploration area is only marginally defined. <br />The strata in the Dry Fork and Lions Mesa areas dip generally at 4 degrees to the north and <br />northeast. Steeper dips are assumed to occur in the proximity of the Mt. Gunnison laccolith <br />although the extent of folding is unknown at this time. <br />Water Resources <br />The town of Paonia, situated about 10 miles west of the exploration area, averages around 15 <br />inches of precipitation annually. Given that precipitation increases as elevation increases, the <br />annual precipitation of the Dry Fork area would be expected to be somewhat higher. An <br />estimated 75% of the annual precipitation occurs during late winter and early spring, mostly as <br />snowfall. June, July, and August are often the driest months. <br />• The East Fork of Minnesota Creek and the North Fork of the Gunnison River are the principal <br />drainage systems in the area, flowing east to west both north and south of the application area. <br />The exploration area is drained primarily by Deep Creek, which flows northward into Ravens <br />Gulch and by intermittent streams that comprise the Dry Fork of Minnesota Creek drainage, <br />which in turn flows west, and southward into Minnesota Creek. Minnesota Creek joins the North <br />Fork of the Gunnison River at the town of Paonia. <br />The Rollins Sandstone Member is located beneath the Lower Coal Member of the Mesa Verde <br />Formation. The Rollins Sandstone, a massive marine sandstone, has been identified in literature <br />as a potential regional aquifer. Recent and historic monitoring well data and analytical data, <br />however, indicate a low potential for aquifer characteristics in the exploration area. Localized <br />perched ground water aquifers within the sandstone lenses of the Upper Coal Member and the <br />Barren Member of the Mesa Verde Formation. <br />Evaluation of water inflows encountered at the West Elk Mine, operated by Mountain Coal <br />Company, indicates that significant amounts of non - tributary water can be held within and <br />transported through fault zones in the Mesa Verde Group including the Rollins Sandstone. Faults <br />intercepted during mining of the B -Seam at the West Elk Mine have encountered substantial <br />inflows and in all instances the flows have quickly diminished and stabilized to a minimal <br />amount. The proposed exploration drilling is not expected to encounter any water bearing fault <br />zones. <br />3 <br />
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