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2015-10-06_PERMIT FILE - C1981019A (3)
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2015-10-06_PERMIT FILE - C1981019A (3)
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Last modified
9/27/2016 11:02:24 AM
Creation date
1/6/2016 11:04:12 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
10/6/2015
Doc Name
Performance Standards
Section_Exhibit Name
Volume 15 Rule 4
Media Type
D
Archive
Yes
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RULE 4 PERFORMANCE STANDARDS <br />of finer and coarser materials. The formation is comprised principally of mudstones, siltstones <br />and coals, with sandstone layers being least prevalent. <br />The Williams Fork Formation conformably overlies the Iles Formation. The Iles Formation is <br />comprised of sandstones, siltstones and marine shales. At the top of the Iles Formation, and <br />immediately below the Williams Fork Formation, is the Trout Creek Sandstone (TCSS). The <br />TCSS is a massive, white to light gray, very fine to fine grained, moderately well sorted <br />sandstone with a thickness of between 50 and 70 feet and is approximately 1,200 to 1,300 feet <br />below the ground surface in the current and proposed mining areas of Colowyo. This is the only <br />mapped and known continuous unit in the area of the CM. This sandstone has been noted as <br />being an excellent marker bed for correlation work with the overlying coal seams. <br />Geoloizic Structure <br />Two major features, the Collom Syncline (on the north) and the Danforth Hills Anticline/Wilson <br />Dome (to the south), control the primary geologic structure in the area of CM. All of the current <br />and proposed mining areas are located between these structural features. There are two minor <br />synclines on the eastern and western edge of the current and proposed mining areas known as the <br />Elkhorn and Morgan synclines, respectively. (As noted above, this data and associated geologic <br />maps can be found in the recent permit applications to DRMS). <br />The current mining area is located on the south flank of the Collom Syncline. The axis of the <br />Collom Syncline, located approximately 0.5 miles north of the north edge of the reclaimed East <br />Pit, trends west-northwest (approximately N60°W) with a slight dip in the axis to the west- <br />northwest. The Collom Syncline is sub -parallel to the Axial Anticline to the north and the <br />Danforth Hills Anticline on the south. The Collom Syncline is asymmetrical, with the north flank <br />of the syncline steeply dipping (20°-40°) to the south-southwest. The south flank dips to the <br />north-northeast at around 10°f5°. Thus, due the geologic structure of the area, the coal seams <br />and non -coal beds dip to the north-northeast at approximately 10°. The dip of the rock on the <br />eastern portion of the CM is partially controlled by the Elkhorn syncline located east of the CM. <br />Although the rock still has a primary north component there is some dip to the east. <br />In the middle of the South Taylor mining area, a structural high, an unnamed anticline, is present, <br />which is an offshoot of the Danforth Hills anticline. This is associated with a small -unnamed <br />syncline near the valley floor of the West Fork of Good Spring Creek. The anticline causes the <br />rock to dip predominantly to the north and south. <br />The proposed Collom mining area is located in a similar geologic setting as the current Colowyo <br />mining area of the West Pit and the inactive East Pit. <br />Hydrologic Conditions <br />Based on the above discussion, the Colowyo active mining area and associated Colowyo <br />properties are located on a topographic and structural high. This causes any surface or ground <br />water to flow from a south to north direction due to slope and dip of the sediments. <br />In addition, the topography, structure and erosional features in the area south of the permitted <br />areas cause the top of the Iles formation (including the TCSS) and the bottom one-half of the <br />Williams Fork to be exposed on both sides of Wilson Creek, above the valley floor. <br />Bedrock Ground Water <br />Collom — Rule 4, Page 18 Revision Date: 9/28/11 <br />Revision No.: PR -03 <br />
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