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2009-05-06_REVISION - C1980005
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2009-05-06_REVISION - C1980005
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Last modified
8/24/2016 3:46:15 PM
Creation date
5/6/2009 1:18:33 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
REVISION
Doc Date
5/6/2009
Doc Name
Adequacy Response
From
Seneca Coal Company
To
DRMS
Type & Sequence
MR60
Email Name
DTM
Media Type
D
Archive
No
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The coreholes may intercept the "J" and Twentymile Sandstones. In addition, the coreholes will most likely <br />intercept the Lennox, Wadge and possibly Sage Creek coal units. It is not anticipated that the coreholes will <br />intercept the underlying Trout Creek Sandstone. Figure 1, General Stratigraphic Column - Routt County Area, <br />shows the general stratigraphy for the Sage Creek area. <br />Surface ToppaVhy: The general topography of the area is characterized by relatively gentle north-northeast <br />facing, moderately sloping, side slope benches and ridges, with steep south-southwest facing escarpments on the <br />east and south end of the project area. Topographic relief in the proposed exploration area is approximately 6,500 <br />feet to 7,200 feet. <br />Geologic Setting: Coal bearing strata of the project area are part of the Iles and Williams Fork Formations of the <br />Mesaverde Group. The coals of primary economic interest are designated as the Middle Coal Group, and include <br />the Lennox, Wadge, Sage Creek and Wolf Creek coal seams. These units and their stratigraphic sequences are <br />illustrated in Figure 1. <br />The proposed exploration area is located in the southern extension of the Waskaki/Sand Wash Structural Basin. <br />The basin is bordered on the east the Park Range Anticline and on the southwest by the Axial Basin Anticline. <br />Stratigraphically, the Middle Coal Group was deposited between two regressive sandstone deposits. Surface <br />expressions of these two sandstone units, the Twentymile Sandstone Member of the Williams Fork Formation, <br />and the Trout Creek Sandstone Member of the Iles Formation appear as prominent cliff-forming units throughout <br />the Williams Fork Mountains. <br />The coal seams in the project area occur within a localized structural basin, with the axis both trending and <br />plunging to the north. It is defined by the Tow Creek Anticline on the east, the Sage Creek Anticline on the west. <br />The Fish Creek Anticline and Washakie Syncline trend northwest through the project area. Dips range from <br />. approximately 9° along the east flank of the Sage Creek Anticline, to 15 - 20° to the north. Faulting associated <br />with the Tow Creek Anticline has been identified within the area by U.S. Geological Survey geologists. Other <br />faulting in the area is likely, but not well understood, and better definition of the occurrence and extent of faulting <br />is one of the primary objectives of the proposed exploration program. <br />Surface Water Resources: The project area is bounded on the north and northwest by Sage Creek, and to the east <br />and southeast by Grassy Creek, perennial tributaries to the Yampa River. The drainage areas that flow northwest <br />toward Sage Creek are characterized by ephemeral flows, typically flowing only in response to spring snowmelt <br />and summer precipitation. Subwatersheds that drain eastward to Grassy Creek include Scotchman's Gulch and <br />Armand's Draw and are characterized by ephemeral or intermittent streamflows. The proposed exploration <br />drilling will be conducted so as not to adversely impact any of the potentially affected drainages. <br />SCC, as part of its Seneca II Mine and Yoast Mine operations, evaluated Grassy Creek, Scotchman's Gulch, <br />Annand's Draw and Sage Creek for Alluvial Valley Floors (AVFs). The AVF evaluations were conducted in <br />accordance with Colorado program AVF guidelines; the CDRMS determined there were no AVFs along Grassy <br />Creek, Scotchman's Gulch and Annand's Draw within the exploration area. There are several small fields along <br />Sage Creek that meet the AVF criteria, but they are all upstream of the project area. BLM, as part of the Coal <br />Suitability Review for the Little Snake Resource Management Plan, evaluated lands with federal coal to <br />determine if mining would interrupt, discontinue or preclude farming operations. The BLM did not identify any <br />AVFs in the project area. <br />Groundwater Resources: Groundwater occurrence within the project area is generally limited to the Trout Creek <br />and Twentymile sandstone units and the shallow alluvial/colluvial aquifers associated with <br /> <br />Sage Creek Project - 2009 N01 <br />04108/09
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