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REV10022
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REV10022
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Entry Properties
Last modified
8/25/2016 1:10:42 AM
Creation date
11/21/2007 10:09:16 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981035
IBM Index Class Name
Revision
Doc Date
8/19/2007
Doc Name
Proposed Decision & Findings of Compliance
From
DRMS
To
National King Coal, LLC
Type & Sequence
RN5
Media Type
D
Archive
No
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Regional Geology <br />The mine permit area lies on the northern rim of the San Juan Basin. This basin is an asymmetric <br />structural basin in northwestern New Mexico and southwestern Colorado. The outcrop belt that <br />extends around the northern rim of the San Juan Basin exposes rocks of the Mesaverde Group, which <br />overlies the Mancos Shale. The Mesaverde Group is composed of three major units (in ascending <br />order): Point Lookout Sandstone, Menefee Formation, and Cliffhouse Sandstone. <br />Of the two coal seams exposed in the permit area, only the upper seam of the Menefee formation has <br />been developed at the King I Mine and is being developed at the King II Mine. Thickness of the <br />upper seam ranges between less than 48 inches to more than 76 inches. The upper seam is overlain <br />by a sequence of interbedded sandstone, shale, carbonaceous shale, and coal, which is overlain by a <br />massive sandstone that is resistant to erosion. The upper seam has 100 to 400 feet overburden <br />throughout much of the permit area. <br />The lower coal seam is well exposed at the nearby Barnwell Mine (an operation that began in the <br />1940s, but has long been abandoned and was never permitted under SMCRA). The lower coal seam <br />of the Menefee has an average thickness of 48 inches. This seam lies approximately 80 feet below <br />the upper seam with inter-bedded sandstone and shale between the two seams. <br />Ground Water Hydrology <br />The following four water-beazing stratigraphic units have been identified in the vicinity of the permit <br />area: the alluvium of Hay Gulch (poorly consolidated stream gravel, sand, silt, and clay of Recent <br />age), the Cliffhouse Sandstone (Cretaceous marine barrier bar complex), the Menefee Formation <br />(Cretaceous fluvial sandstone and coal swamp deposits), and the Point Lookout Sandstone <br />(Cretaceous marine beach and bar deposits). Figure 1 shows the hydrostratigraphic setting. <br />The Hay Gulch alluvium consists of unconsolidated and poorly consolidated gravel, sand, silt, and <br />clay that was deposited by stream flow in Hay Gulch during the last several thousand years. The <br />alluvium is several tens of feet thick and is approximately 1,000 feet wide. NKC has monitored the <br />Hay Gulch alluvium for more than 20 years in a monitoring well (the Wiltze well) next to the King I <br />Mine. Ground water in the alluvium is unconfined. The alluvium is recharged by snowmelt and <br />precipitation, and by seepage from the Menefee Formation subcrop along the north side of Hay <br />Gulch. The elevation of the water table varies seasonally, ranging from just above the ground surface <br />to a few feet below the surface. Ground water in the alluvium probably flows downstream along Hay <br />Gulch. NKC's annual hydrology reports show ground water in the Hay Gulch alluvium is a <br />magnesium-calcium-sulfate type of water that has a high concentration of total dissolved solids <br />(TDS). TDS concentrations consistently are more than 1,500 mg/l, rendering the water unsuitable <br />for domestic and irrigation purposes, but marginally suitable for stock watering. Sulfate <br />concentrations are greater than 600 mg/I. Sulfate concentrations greater than 250 mg/l can cause <br />weight-loss in livestock. There aze no known private wells completed in the Hay Gulch alluvium <br />near the permit area, other than a well used by the mine. <br />The Cliffhouse Sandstone is afine-grained sandstone that was deposited in a barrier bar <br />complex along a marine shoreline. The Cliffhouse is more than 200 feet thick. NKC's mine <br />5 <br />
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