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2017-04-05_GENERAL DOCUMENTS - C1982057
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2017-04-05_GENERAL DOCUMENTS - C1982057
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Last modified
4/10/2017 10:14:52 AM
Creation date
4/10/2017 10:12:09 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
General Documents
Doc Date
4/5/2017
Doc Name Note
Includes Reclamation Cost Estimate
Doc Name
Proposed Decision and Findings of Compliance
From
Seneca Property LLC
To
DRMS
Permit Index Doc Type
Findings
Email Name
JDM
JHB
Media Type
D
Archive
No
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coal group contains the seams of economic importance. Four coal seams of economic importance <br />are found in the Williams Fork Formation. These seams are, in ascending order, the Wolf Creek, <br />Sage Creek, Wadge, and Lennox coals. Due to discontinuous occurrence of the Sage Creek seam, <br />and excessive overburden cover relative to seam thickness over much of the permit area, the <br />operator extracted Wolf Creek and Sage Creek coals within only selected areas of the South <br />Extension Area. The Lennox seam is locally present in the Wadge overburden. It is usually two <br />to five feet thick, but has been eroded away in some areas, and is not recovered by mining <br />operations. <br />The Wolf Creek coal is split into an upper and lower unit. The lower seam is about 16 feet thick, <br />while the upper is about 7.5 feet thick. Above the Wolf Creek seam within portions of the permit <br />area, and separated by 100 to 150 feet of interburden, is the Sage Creek seam. The Sage Creek <br />seam ranges from 2 to 5 feet thick where it occurs in the permit area. SCC initiated mining of <br />selected areas of both the Wolf Creek seam and the Sage Creek Seam in the South Extension Area, <br />upon approval of PR -3, in 2003. Neither seam was previously mined at Seneca II -W. Overlying <br />the Sage Creek seam is a 50- to 65 -foot thick zone of sandstone interbedded with shales and <br />siltstones. Immediately above this sequence is the Wadge coal seam. The Wadge coal seam is the <br />most continuous in the area and is the only seam that was extracted prior to 2003. The outcrop <br />strikes about north -south, and dips 8 to 14 degrees. The Wadge is also split into upper and lower <br />seams. The lower is two to three feet thick, and is separated from the 10 foot thick upper seam by <br />two to five feet of shales and sandstones. Overlying the Wadge is about 560 feet of sandstones, <br />shales, and coal, including the Lennox Coal Seam, which has been eroded away in places. <br />Overlying this lower unit of the Williams Fork Formation is the 130 -foot thick Twenty Mile <br />Sandstone. The upper most unit of the Williams Fork Formation consists of interbedded <br />sandstones, shales, and thin coals. <br />The surficial geology of the area is composed chiefly of sedimentary rocks, of marine and <br />non -marine origin. These sedimentary rocks were formed through the transgression and regression <br />of an epicontinental sea. <br />Alluvial deposits are locally present in stream valleys, particularly along the larger streams. <br />Colluvial slides and slumps are also present in canyons and gullies throughout the area. Slide <br />bodies which could potentially affect the stability of mining related structures in the northern <br />portion of the permit area have been identified, and mitigation measures are addressed in Section <br />VII., 'Backfilling and Grading" of this document. <br />Geologic baseline information including local and regional structure, stratigraphy, and information <br />on interburden, overburden and coal geochemistry is provided in Volume 2, Tab 6, of the permit <br />application. <br />viii <br />
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