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GENERAL39731
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GENERAL39731
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Last modified
8/24/2016 7:59:06 PM
Creation date
11/23/2007 10:20:05 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981035
IBM Index Class Name
General Documents
Doc Date
7/9/1987
Doc Name
Proposed Decision & Findings of Compliance for RN1
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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The King Coal Mine is located on the northwestern rim of the San Juan Basin. <br />The San Juan is an asymmetric structural basin in southwestern Colorado and <br />northwestern New Mexico. The basin contains sedimentary rocks ranging in age <br />from Cambrian to Holocene. The consolidated strata exposed in and near <br />Hay Gulch were deposited during the upper Cretaceous period. <br />The stratigraphic unit of interest is the upper Cretaceous Mesaverde Group. <br />The lowermost member of the Mesaverde Group is the 300 to 400 foot thick Point <br />Lookout Sandstone: The upper portion of the Point Lookout is a massive, white <br />to buff, cliff forming sandstone, while the lower portion becomes shaley; <br />grading into the underlying Mancos Shale: <br />The Menefee Formation; which conformably overlies the Point Lookout Sandstone, <br />is the coal bearing unit in this area. At the mine site; the Menefee dips 3° <br />to the southeast; and strikes N35°W: This formation consists of approximately <br />350 feet of interbedded sandstone; shale; carbonaceous shale; and coal. Two <br />coal seams appear to be the most continuous units in the formation: The upper <br />seam, which is the coal to be extracted; is about 5 feet to 6 feet thick at <br />the King Coal mine site: <br />Conformably overlying the Menefee Formation in the Durango area is the <br />uppermost member of the Mesaverde Group, the Cliff House Sandstone. The 350 <br />foot thick Cliff House is a grey marine sandstone interbedded with shale. The <br />sandstones are typically lenticular, but may be locally massive, while the <br />shales are generally barren of coal: This unit; however, has been removed by <br />erosion at the mine site. In its place is a thin veneer of fine grained <br />materials locally derived from erosion: <br />Recent unconsolidated alluvial/colluvial material forms the surface of Hay <br />Gulch, adjacent to the King Coal Mine: This material is derived from erosion <br />of the middle to upper Mesaverde Group in the immediate vicinity of the mine <br />site. <br />No landslides or other mass movements have been identified within the King <br />Coal permit area. <br />Based upon geochemical sampling and on-site observations; it appears that the <br />coal has some potential to be acid-forming or toxic-forming: Some coal waste <br />material is temporarily stockpiled on site prior to returning it to the <br />underground workings. Upon final reclamation some of this material will be <br />used to backfill the mine entries: This material will not impact the <br />post-mining land use or revegetation efforts: <br />The operation is in compliance with the requirements of this section. <br />Ground Water Hydrology - Rules 2.04.5, 2.04.7, 2.05.6(3) and 4.05 <br />Ground water hydrology information may be found in the permit application in <br />Section 2.04 and 4,05. <br />Two aquifers have been identified within the area potentially affected by the <br />King Coal operation: the Hay Gulch alluvial aquifer; and, the Point Lookout <br />Sandstone. <br />-7- <br />
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