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PERMFILE107193
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PERMFILE107193
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Last modified
8/24/2016 9:59:45 PM
Creation date
11/24/2007 2:51:47 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056A
IBM Index Class Name
Permit File
Doc Date
10/14/2007
Section_Exhibit Name
2.05.5 Postmining Land Uses
Media Type
D
Archive
Yes
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Mining District. When the outcrop was perpendicular to the face, cracking of the outcrop occurred with no <br />spalling. When the outcrop was parallel to the panel then cracking and spalling of the outcrop occurred. <br />• Based upon the above factors Twentymile does not anticipate any rock fragments entering Middle Creek. The <br />limited amount of outcrop and the panel orientation will minimize spalling of the outcrop. <br />NORTHERN MINING DISTRICT (PR 99-OS) <br />Additionally, mining will continue to the north; this will result in subsiding Fish Creek and its alluvial valley floor, <br />two man-made impoundments, feeder ditch, Twentymile Sandstone, Routt County Road 33, and the Union Pacific <br />Railroad Track. ~ Each will be discussed below. <br />Land Use <br />Pastureland and rangeland are the predominant land uses in the Northern Mining District. Historically, some of the <br />areas, i.e. part of Section 21, have been identified as cropland. Recently, however, the decision was made to return <br />it to pastureland as it is the more appropriate use for these lands. The land use patterns are presented in Map 3, <br />Premining Land Use. <br />The reason for returning these areas to pastureland is that the previous landowners had broken out pastureland and <br />rangeland and planted grain crops. This was done typically in response to governmental programs. Presently a <br />federal program exists which compensates landowners returning these marginal cropland areas to grasslands. TCC <br />is not involved with this program but has acquired lands, which were enrolled in the CRP program. TCC has <br />elected to keep these areas in grass or plant them back to pastureland. The current land uses in the surrounding area <br />also demonstrate that previously marginal croplands have been returned to grasslands. Therefore, it is TCC's <br />opinion that pastureland was and is the appropriate use for these lands in and around its affected areas. <br />• Existin¢ Structures <br />Aquifers <br />The Twentymile Sandstone outcrops along sections of the Foidel and Middle Creek drainages. The Twentymile <br />Sandstone is a large regional aquifer located throughout northwest Colorado. There are no known water supply <br />wells completed in the Twentymile Sandstone in the vicinity of the mine. <br />County Road 33 <br />TCC plans to subside Routt County Road 33, which is a two-lane asphalt road; refer to Map 23B, Structures and <br />Renewable Resources, for location when longwall mining commences in Panel ]2 Right within the proposed five- <br />year permit term (1998-2003). <br />Twentymile has undermined and subsided Routt County Road 33 where it overlies panel 9, 8, 7, and 6 Right. TCC <br />monitored the road while mining and subsidence were occurring and cracking was observed in the road. The cracks <br />were of limited size, i.e. maximum width 2 - 3 inches, and extended into the road shoulder. <br />In reference to Panel 12 Right, TCC enlisted the services of SubTerra, Inc. to evaluate the potential for rocks to <br />reach RCR No.33. The results of his investigation are presented in Exhibit 7F-I, Rockfall Hazard Assessment- <br />Pond 12 Right. TCC will follow the recommendation presented in this Exhibit. <br />Powerline <br />The powerline that is located to the north of the 18 Right Gateroad is outside of the area to be subsided during <br />mining associated with the proposed five year permit term (1998-20031 and the angle of draw form the ]6 Right <br />longwall panel. The powerline is adjacent to a gateroad, however, TCC's extensive mining experience indicates <br />.that the powerline will not be impacted. The reasoning for this is two-fold, the first being limited extraction <br />APPRONEY3 JUN 2 8 2000 <br />PR 99-OS 2.05-181.5 5/03/00 <br />
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