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GENERAL46267
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Last modified
8/24/2016 8:17:47 PM
Creation date
11/23/2007 2:30:14 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
5/2/2003
Doc Name
Proposed Decision & Findings of Compliance for PR3
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Description of the Environment <br />The Seneca II-W Mine is located in northwest Colorado approximately 7 miles south of Hayden <br />in Routt County. The Seneca II-W Mine lies 7 miles west of the Seneca II Mine, Permit No. <br />C-80-005 and 3.5 miles west of the Yoast Mine, Permit No. C-94-082. See Figure 1 for further <br />detail. The mining area can be found on the Hayden, Hayden Gulch, Mount Harris and Dunkley <br />Quadrangles 7.5 Minute Series Maps. The coal from Seneca II-W is hauled over county and <br />private roadways by private hauler to the Hayden Station Power Plant operated by Public Service <br />of Colorado. Haulage distance is approximately ten miles each way. Baseline environmental <br />information collected for the Seneca II-W Mine can be located in Tabs 4 through 11 in the permit <br />application. <br />Geology and Topoeranhv <br />Elevation of the general mine site varies from approximately 6400 to 8350 feet. Slopes range <br />from about 2 percent to nearly 100 percent. Prominent ledges are formed by the Twentymile <br />sandstone in the western permit area and the Trout Creek sandstone ledge in the eastern permit <br />boundary. Many of the drainages are deeply incised. <br />The Seneca II-W Mine is situated in the southeastern synclinal portion of the Sand Wash <br />Structural Basin of northwestern Colorado and south central Wyoming. Exposed strata near the <br />mine site vary in age from Late Cretaceous to Quaternary. Most units in the area are <br />sedimentary. However, some Miocene extrusives are locally present. Many faults and folds <br />modify the regional synclinal structure, however, no faults have been identified at the site. The <br />most significant local fold is the Sage Creek Anticline, located just east of the mine. Rock units <br />dip 8 to 14 degrees to the west. The Seneca II-W Mine lies on the western flank of this <br />anticline. The largest local structure is the Tow Creek Anticline, located about 10 miles <br />northeast of the permit area. <br />The local stratigraphic sequence, in ascending order, is the Mancos Shale; the Mesaverde Group, <br />which is subdivided into the Iles and Williams Fork Formations; and the Lewis Shale. See Figure <br />2 for further detail. <br />The Iles Formation is divided into three members. The basal Tow Creek Sandstone is a massive, <br />fine grained, well sorted sand. The Tow Creek varies from 35 to 125 feet thick. Overlying the <br />Tow Creek are 1200 feet of interbedded shales, sandstones, and coals. The coals, while mined <br />in the vicinity, are too deep to be considered economically recoverable at the Seneca II-W Mine. <br />The massive, fine grained, 100 feet thick Trout Creek Sandstone is the uppermost unit of the Iles <br />Formation. <br />Conformably overlying the Iles is the Williams Fork Formation. The lower unit of the Williams <br />Fork Formation is a series of interbedded shales, sandstones, sandy shales and coal. The middle <br />coal group contains the seams of economic importance. Four coal seams of economic importance <br />Seneca II-W Findings Document 7 June 15, 2001 <br />Permit Renewal No. 3 May 2, 2003 <br />
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