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2012-01-23_REVISION - M1980055HR
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2012-01-23_REVISION - M1980055HR
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Last modified
6/15/2021 2:25:36 PM
Creation date
1/27/2012 8:11:02 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1980055HR
IBM Index Class Name
REVISION
Doc Date
1/23/2012
Doc Name
Final EPP with Constr. Schedule.
From
Denison Mines
To
DRMS
Type & Sequence
AM1
Email Name
RCO
SSS
Media Type
D
Archive
No
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6.0 Evaluation of Proposed and Existing Environmental <br />Protection Facilities <br />An environmental protection facility (EPF) is defined by HRMMR §1.1(15) as follows: <br />"Environmental Protection Facility" means a structure which is identified in <br />the "Environmental Protection Plan" as designed, constructed, and operated <br />for control and containment of designated chemicals, acid mine drainage, or <br />toxic or acid-forming materials that will be exposed or disturbed as a result of <br />mining and reclamation operations." <br />Although geochemical assessment of ore has indicated that the material is not toxic <br />forming from a risk management criteria (RMC) perspective, as a best management <br />practice, Denison has designated ore storage pads as EPFs for the Sunday Mines <br />Group. Production and storage of ore is not currently being conducted at the Sunday <br />Mines Group. Prior to resuming these operations, Denison will construct ore pads <br />that are compliant with DRMS' "General Ore Pad Construction Criteria." Denison is <br />committed to providing containment of surface water in contact with ore material. A <br />summary of design for the ore storage pads, including the use of a geomembrane <br />liner, is provided below. The complete ore storage pad design (e.g., specifications and <br />drawings) is provided as Attachment S. <br />6.1 Proposed Ore Storage Pad with Geomembrane Liner <br />The ore stockpile areas at the Sunday Mines Group are currently located at the St. <br />Jude, Sunday, Topaz, and West Sunday Mine sites. The construction of an ore storage <br />pad is not planned for the Carnation Mine; ore is not produced at this mine. Ore is <br />temporarily stored at these stockpile locations and is routinely transported by truck to <br />the White Mesa Mill near Blanding, Utah for processing (ore is typically stored for <br />relatively short time periods of one to two weeks; less than 180 days). Ore storage <br />pads will be constructed at each of these stockpile areas to contain surface water <br />during future ore storage /stockpiling activities. <br />6.1.1 Proposed Ore Storage Pad Design <br />The existing ore stockpile areas will each be replaced with an 80 -ft by 80 -ft proposed <br />ore storage pad at both the Topaz and Sunday Mine, and an 60 -ft by 60 -ft at both the <br />West Sunday and St -Jude Mine. On site soils do not meet the minimum requirements <br />of plasticity (plasticity index of 10 percent) for use as soil liner material. Accordingly, <br />Denison will use a polyvinyl chloride (PVC) geomembrane liner for ore pad <br />construction. The pad layout is shown in Figures 2 -2 through 2 -5. Soil from the <br />footprint of each ore storage pad will be used to construct a berm along the perimeter <br />of the pad. The berm will be constructed to contain surface water run -off from the pad <br />area and prevent surface water run -on. The geomembrane liner will be installed <br />consistent with the manufacturer's specifications and an anchor trench will be <br />constructed to secure the liner. Bedding and cover material, typically with grain size <br />no larger than 3/8 -inch in diameter, will be used to prevent puncture damage to the <br />membrane from the use of heavy equipment on the pad. <br />C \ Users 1cwoodwardlDesktop \Sundays \FINAL - Environmental Protection Plan Sunday Mines Revised January 2012 docx <br />6 -1 <br />
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