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GENERAL46561
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Last modified
8/24/2016 8:20:26 PM
Creation date
11/23/2007 2:44:15 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1978116
IBM Index Class Name
General Documents
Doc Date
11/3/2005
Doc Name
DMO-Evaluation of Potential Contaminant Migration
From
Cotter Corporation
To
DMG
Permit Index Doc Type
DMO
Media Type
D
Archive
No
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SM-18 Mine Report <br />GeoScience Services <br />The following sections of this report provide a site description of the mining <br />activities and the associated hydrologic conditions, a description of the numerical model <br />used to simulated groundwater and contaminant transport, and a discussion of the results <br />and environmental impacts of mining operations on the groundwater and surface water <br />systems. All work was conducted under the direction of the Cotter Corporation. <br />2.0 Site Description <br />The SM-18 mine is located east of the former town of Uravan on the valley walls <br />approximately 400 feet above the San Miguel River. The waste rock area adjacent to the <br />mine is approximately 1800 feet from the river. According to the geologic map (McKay, <br />1955), the waste rock is located approximately at the contact between the Brushy Basin <br />and Salt Wash Members of the Morrison Formation (Figure 1). Approximately 270 feet <br />of Salt Wash interbedded sands and mudstones underlie the site with another120 feet of <br />Summerville mudstones and 120 feet of Entrada Sandstone. In the San Miguel River <br />valley, the upper portion of the Entrada Sandstone has been eroded and replaced by river <br />alluvium. <br />The geologic structure shows that the rock layers in the vicinity of the mine dip to <br /> <br />the northeast or away from the river. For modeling simulations, however, it was assumed <br />that the larger structural feature of the southwest dip from the Uncompahgre uplift has <br />generated sufficient regional elevation that hydraulic pressures in the Entrada aquifer <br />result in groundwater flow toward the San Miguel River. Consequently, modeling <br />simulations discussed in subsequent sections assume downward movement of <br />constituents of concern from the waste rock through the unsaturated Salt Wash Member <br />and the Summerville Formation with horizontal movement via groundwater flow in the <br />Entrada Sandstone and river alluvium that eventually discharge into the San Miguel <br />River. <br />2 <br />
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