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GENERAL34738
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Last modified
8/24/2016 7:56:03 PM
Creation date
11/23/2007 8:01:43 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
11/3/1999
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR PR2
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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conditional issue requires SCC to provide proof of resolution of a Kentucky civil penalty violation <br />and bond forfeiture. The same condition was placed on Minor Revision No. 42 and Stipulation <br />24 was attached to the permit on July 29, 1997. <br />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 azea 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 Topography <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 Twenrymile <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 Structural <br />Basin of northwestern Colorado and south central Wyoming. Exposed strata near the mine site <br />vary in age from Late Cretaceous to Quaternary. Most units in the area are sedimentary. <br />However, some Miocene extrusives are locally present. Many faults and folds modify the regional <br />synclinal structure, however, no faults have been identified at the site. The most significant local <br />fold is the Sage Creek Anticline, located just east of the mine. Rock units dip 8 to 14 degrees to <br />the west. The Seneca II-W Mine lies on the western flank of this anticline. The largest local <br />structure is the Tow Creek Anticline, located about 10 miles northeast of the permit azea. <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, aze 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 />Seneca II-W Findings Document 5 November 3, 1999 <br />
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