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2013-11-07_PERMIT FILE - M2013070
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2013-11-07_PERMIT FILE - M2013070
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Last modified
8/24/2016 5:37:08 PM
Creation date
11/13/2013 10:22:29 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2013070
IBM Index Class Name
PERMIT FILE
Doc Date
11/7/2013
Doc Name
New Application
From
Liberty Mining, LLC
To
DRMS
Email Name
GRM
THM
Media Type
D
Archive
No
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Liberty Mining, LLC <br />DRIAS 1 i 0 -d Permit Application <br />October 2013 <br />B (c.2) Groundwater <br />Current and historical mine exploration boreholes have been relatively dry, except in zones of <br />infiltration by surface water. Significant groundwater is not expected to be found in the <br />underground mine workings. The geologic formations in the mine area consist of relatively flat <br />sediments beneath a 0 -60 foot thick layer of colluvium. The only pathway for groundwater <br />recharge is through surface water infiltration. The geology is characterized by interbedded <br />siltstone, mudstone, and sandstone with varying amounts of silt and clay. These low <br />permeability beds beneath the colluvium restrict vertical infiltration of surface water. <br />As noted, the mine site and surrounding areas are overlain with 0 to 60 feet of colluvium. The <br />colluvium has a relatively higher permeability and receives infiltration from precipitation and <br />surface water runoff. <br />The geologic setting of the mine site suggests minimal groundwater presence, starting with the <br />Brushy Basin, a member of the Morrison Formation. Figure 1 and 2 depict a generalized <br />geologic cross section of the mine area. The Brushy Basin Member is the uppermost defined <br />geologic formation at the mine site and is overlain with 0 to 60 feet of colluvium deposits. The <br />Brushy Basin is known to be a confining layer with low permeability; except in areas of exposure <br />to the surface and areas of significant fracturing. The Brushy Basin is exposed at the surface at <br />the Liberty Mine site allowing for some infiltration of precipitation, or is otherwise subject to <br />contact with precipitation which infiltrates through the colluvium. The average thickness of the <br />overlying Brushy Basin is approximately 100 to 160 feet in thickness. The thickness of the <br />Brushy Basin ranges from nonexistent on the eastern portion of the site (Monitor Well 3) to <br />approximately 180 feet thick (Monitor Well 1) at the western boundary of the mine site. The <br />next lower member of the Morrison Formation is the Salt Wash Member, which is also known as <br />a confining layer. The Salt Wash Member consists of interbedded sandstone, mudstone and <br />siltstone with thin limestone beds near the base of the formation. At the Liberty Mine site, the <br />Salt Wash Member is marginally exposed at the surface near the eastern site boundary and <br />thus may receive a little recharge from precipitation and runoff through fractures. The areas <br />within the Salt Wash that would have water infiltration are areas with fracturing. <br />Below the Morrison is the Wanakah Formation, formerly known as the Summerville or Tidwell <br />Formation. The Wanakah is comprised of thin alternating beds of sandy shale and mudstone <br />layers and is known as a confining layer with low to very low permeability. The Wanakah can <br />vary from 0 to 130 feet in thickness. Based on the well log of Monitor Well 1, the Wanakah is <br />greater than 80 feet thick. Below the Wanakah is the Entrada Sandstone Formation consisting <br />of massive crossbedded sandstone overlying alternating layers of mudstone, siltstone and <br />sandstone. The Entrada is estimated to be approximately 300 feet thick in the area of the mine. <br />The nearest known regional aquifer is found in the Entrada Formation and it is estimated to be <br />approximately 680 feet below the mine portal. At the proposed maximum depth of the <br />underground mining activities; a minimum of 300 feet of stratigraphy would separate the <br />Entrada from the mine workings. Two monitoring wells have been installed into the top of the <br />Wanakah Formation. Quarterly groundwater monitoring is planned for five consecutive calendar <br />quarters, beginning in early 2013. <br />Lit,tr "v Mining, LLC 10cvf, Ufa!-, SMA Ref 562 I Page <br />
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