2006-04-19_REPORT - M1977004 - Laserfiche WebLink

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Pilch Reclamation Protect April 14, 2008 7005 Annual Reclamation Report Page 7 • II is possible that in future years, with above average precipitation, or the occurrence of other exceptional ambient conditions. some increase in displacement mayoccur. Overall, the potential for rapid, large-scale slope displacement, given normally expected conditions, appears to be low based on evaluation of data to date. Table 1 2004-2005 Survey Monument Displacement ~Pomt ID Total Cho Ivey) ~ Dip Direction Displacement) (deg 1 _~ MP•18 _ 0.24 -t0 239 _ P-29 ~ U.22 -5 225 h1P-35 0.16 -15 258 MP•37~0.23 10 _214 _ _ _235 25fi _ 204 • monuments 4.2 Inclinometer Evaluation Three (3) inclinometers were rnstalled in October 1998 (198-1. 198-2, and 198-3) to monitor any subsurface movement within the south and east walls of the North Pit. Inclinometer 198-1 is located on the lowest bench on the South Wall; 198-2 is located on the 10,600 ft. bench of the South Wall and; 198-3 is located above the crest of the East Wall. Data collected in 1999 through 2004 from all three inclinometers indicate minimal subsurface slope movement (less than 0 3 fUyear) and is consistent with the surface monument survey data. This movement is within the instrument error for the inclinometer probe of ± 0.3 inches per 100 ft of depth. Homestake wdl continue to monitor these three inclinometers at a minimum of every two years unless surface monuments detect increasing slope movement Two temporary inclinometers were installed In Piezometers P-8 and P-10 during the winter of 1997- 1998 to provide data in the spring of 1998. These inclinometers were made redundant by the installation of inclinometers 198-1. I98-2. and i98-3. The inclinometers in P-8 and P-10 remain installed, but are not curve/ed on a regular hasis Should surface monuments detect increasing slope movemanl. data coub! he cr;llech~ri inrn thi~SN• r.nmt;inalum hie: r~n~i'~rsrlncl~nom.clers •