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REP20768
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REP20768
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Entry Properties
Last modified
8/24/2016 11:49:17 PM
Creation date
11/27/2007 2:58:10 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977004
IBM Index Class Name
Report
Doc Date
4/23/2002
Doc Name
Geotechnical Report
From
Homestake Mining Company
To
DMG
Permit Index Doc Type
Stability Report
Media Type
D
Archive
No
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D. "10725 -10525" Level <br />Site Description: Identical to that of past reports for 1996 through 2000. The <br />minor overlap between this level and other bench designations reflects the <br />original bench configuration. <br />2001 Observations: Piezometers IC10600 and IC10525 bound this azea. Water <br />levels in IC10525 have demonstrated an equilibrium condition with minor <br />seasonal fluctuations of 3.2 feet in a total dump thickness of about 228.8 feet. As <br />of November 2001, data can again be collected from IC10600. Insufficient data is <br />available for IC10600 for a recent historical analysis of water levels and <br />equilibrium. The phreatic surface in this azea would be expected to respond with <br />similaz seasonal fluctuations as IC10525. HMC will continue to monitor this <br />piezometer in the future and review data for any anomalies. <br />E. "10600 -10400" Level <br />Site Descri tp ion: Identical to that of past reports for 1996 through 2000. <br />2001 Observations: The 2001 observations aze similaz to past yeazs. Piezometer <br />IC10440 was located in this azea, however, it was lost in September 1996. <br />Piezometer IC10525 can also be considered to be within the azea. The 2001 data <br />for that piezometer is described above. <br />F. "10400 -10370" Level <br />Site Descri tion: Identical to that of the past reports for 1996 through 2000. <br />2001 Observations: the 2001 observations aze similaz to past yeazs. Piezometer <br />IC10360 is located in this azea. Water levels in this piezometer have stabilized at <br />about 227 feet bgs with a seasonal fluctuation of approximately 11.8 feet for <br />2001. The total depth of this piezometer is 260 feet and the thickness of the dump <br />is on the order of 240 feet. <br />Piezometer IC10370 is also located in this area. Water levels in this piezometer <br />have also stabilized at about 186.6 feet with a seasonal fluctuation of 0.9 feet for <br />2001. The total depth ofthis monitoring well is 188 feet bgs. <br />During 1997, Homestake reconstructed the face of the permanent low-grade ore <br />stockpile located on the Indian Creek Waste Rock Dump. The purpose of the <br />slope reconstruction was to reduce the potential for infiltration and promote more <br />rapid runofffrom the slope. No seepage was observed in this azea in 2001. <br />
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