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1988-04-29_PERMIT FILE - C1981008A (54)
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1988-04-29_PERMIT FILE - C1981008A (54)
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Last modified
1/5/2021 4:38:13 PM
Creation date
7/11/2011 2:03:18 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981008A
IBM Index Class Name
PERMIT FILE
Doc Date
4/29/1988
Doc Name
Minesoil Reconstruction
Section_Exhibit Name
Tab 21 Minesoil Reconstruction
Email Name
MLT
SB1
Media Type
D
Archive
Yes
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Plan section of this Tab. Since clay percentages and shrink-swell potentials are low, <br /> stability and trafficability problems are not anticipated. <br /> Prior to topsoil replacement, the regraded spoil within mined areas will be scarified by <br /> deep ripping or chisel plowing on the contour to a depth of 12 to 24 inches to reduce <br /> excessive compaction, prevent potential slippage zones, reduce erosion, and improve water <br /> and air movement and root growth across the topsoil/spoil interface (Josiah, 1986). <br /> Abandoned roads shall also be ripped and/or chisel plowed prior to topsoil replacement. <br /> Spoil erodibility is discussed in the Backfilling and Grading (Tab 20) and Facilities (Tab <br /> 13) sections. Soil and topsoil erodibility is discussed in the Soil Survey (Tab 8) and <br /> the Revegetation (Tab 22) sections. <br /> The resultant loamy textured spoil will possess suitable physical qualities which are <br /> conducive to plant growth. The available water holding capacity will likely be moderately <br /> low to moderate (approximately 0.07 to 0.11 inches of water ' per inch of soil), <br /> permeability moderate to moderately rapid (about 1.0 to 6.0 inches per hour), and cation <br /> exchange capacity low to moderately low (5 to 10 milli-equivalents per 100 grams). Since <br /> • the overburden contains a mixture of soft, slightly hard, hard, and extremely hard rock <br /> fragments, the spoil will generally possess acceptable root growth and water holding <br /> characteristics. <br /> The chemical properties of the overburden/interburden are also quite favorable. Sodicity <br /> and salinity levels are low to moderate in the current Nucla East permit area and should <br /> pose no severe problem to successful reclamation. ,.Salinity levels in the upper four feet <br /> of regraded spoil will likely be comparable to premining values. This spoil, overlaid <br /> with 12 to 18 inches of replaced suitable topsoil, will possess favorable physical and <br /> chemical qualities and will be a suitable plant root growth medium (Barth and Martin, <br /> 1982, Schuman et al., 1985). <br /> Nucla Mine Topsoil Balance <br /> Introduction. The historical Topsoil Management Plan and Schedule for Nucla Mine Permit <br /> C-81-008 is contained in Tab 9, Attachments 9-1, 9-2A, 9-2B, 9-2C, and 9-4. The topsoil <br /> balance Attachment 9-3 for Nucla Mine has been transferred, for this Nucla East permit <br /> • submittal, from Tab 9 to Tab 21. This topsoil balance, recently revised for Nucla <br /> Technical Revision No. 2 and Minor Revision No. 8, will subsequently be updated and <br /> submitted to CMLRD by April 15 of each year for the life-of-mine operation. <br /> 21-8 Revised 08/19/88 <br />
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