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2008-04-15_REVISION - M1980244 (191)
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2008-04-15_REVISION - M1980244 (191)
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Last modified
6/15/2021 5:52:03 PM
Creation date
5/6/2008 3:40:35 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
REVISION
Doc Date
4/15/2008
Doc Name
VOL IV APP 5 Surface Mine Slope Design
From
CC & V
To
DRMS
Type & Sequence
AM9
Media Type
D
Archive
No
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• MLESIopeDesign <br />3.4 Adverse Granitic Rock <br />Adverse Granitic Rock occurs on the periphery of Grassy Valley. Adverse Granitic Rock is strong, may <br />have moderate water pressure, and is moderately fractured along schistosity, with structure dipping into <br />proposed mines. Slope analysis (ABC, 2003a) indicates that this rock will stand at 45°. <br />The slope design for this rock is presented in Table 1 and Figure 5. <br />3.5 Dry Pipe Rock <br />Dry Pipe Rock is associated with the Cresson, Globe Hill and Ironclad pipes, and is weak, dry, and <br />highly fractured, to the point of being rubblized. Slope analysis (ABC, 20073) and experience has shown <br />that the maximum overall slope that can be sustained in this rock type is 40°. Practical slope angles are <br />determined by minability: surface raveling and bench filling. <br />The slope design for this rock is presented in Table 1 and Figure 6. <br />3.6 Colluvium <br />Colluvium covers the District at depths from 0 to 60 feet. The Colluvium is clayey gravel with boulders, <br />and is occasionally saturated. Slope analysis (ABC, 1997; ABC, 2007) and experience indicates that the <br />• slopes will stand at 36°. <br />The slope design for this rock is presented in Table 1 and Figure 7. <br />• <br />a A copy of this report is presented in Attachment 2. <br />Report 1385E.20080411 3 <br />
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