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PERMFILE58368
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PERMFILE58368
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Entry Properties
Last modified
8/24/2016 11:00:39 PM
Creation date
11/20/2007 5:50:52 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981020A
IBM Index Class Name
Permit File
Doc Date
11/4/2002
Section_Exhibit Name
2.0 Mine Plan
Media Type
D
Archive
Yes
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2.2-s <br />The August 1981 design cut for Line 3 showed a significant reduction <br />• in the safety factor to 1.008. Once again the ongoing design <br />evaluation showed that this configuration was unacceptable. The <br />revised design, shown in Figure 2.2-22 and Cross Section 2.2-12.33, <br />attains a factor of safety of 1.206. Results of analysis of Line 3 <br />are shown in Table 2.2-5. Because of the large volume of fill <br />required if the road had been shifted out, it was decided that a <br />reduction in overall haul road width and a slight change in <br />alignment must also be undertaken. These changes are also shown on <br />Figure 2.2-22. <br />Reclamation similar to that proposed for Lines 1 and 2 increases the <br />factor of safety to appro;<imately 1.347 for rock and 1.212 for soil. <br />This significant increase over present configuration and original <br />ground will yield a very stable slope after reclamation. <br />Over the life of the mine, it will logically be in GVC's best <br />interest to maintain the haul road in a satisfactory manner. All <br />local slumps and sloughage will be cleaned and disposed of promptly. <br />Temporary revegetation will help control erosion and sediment <br />accumulation in the drainages. Other measures, such as matting or <br />mulching, may be used to control particular troublesome spots. <br />Throughout the life of the mine, slopes will be checked for <br />stability with surveyed reference points at strategic locations. <br />This checking will be done at least annually during spring thaw when <br />• slides tend to occur, but it may also be done more frequently as <br />conditions in the area warrant. If results indicate slope <br />instability, corrective measures will be instituted and DMG will be <br />advised prior to any further disturbance. <br />The actual stability information gained over the life of the mine <br />will also indicate our success or failure of accurately predicting <br />slope stability. This information will then be applied to further <br />analyze reclamation stability. The final picture will evolve over a <br />period of years as actual slope stability is observed. Subsequent <br />permit applications will contain revisions to the reclamation plan <br />as necessary. <br />The analyses of slope stability in proposed road cuts has shown <br />significant increases in stability can be achieved, not only over <br />the life of the mine, but also after reclamation. A summary of <br />results is shown below: <br />Line 1 - Present 1.146, Reclamatio^ Average 1.540 <br />Line 2 - Present 1.040, Reclamation Average 1.247 <br />Line 3 - Present 1.116, Reclamation Average 1.310 <br />Prior to the construction of any embankments, available retrievable <br />topsoil and any vegetative material will be removed from the <br />embankment foundation. Available topsoil material will be <br />stockpiled to be used later to establish vegetation, see Section 2.4 <br />fimbankment slopes will be constructed at 1V:2H and will utilize <br />• keyways or plowed steps where necessary to ensure stability. <br />K1~ <br />~ '~3 <br />
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