Laserfiche WebLink
r <br /> Homestake Mining Company 2017 Geotechnical Observations <br /> rPitch Reclamation Project Indian and Tie Camp Rock Dumps <br /> r 2016 and 2015. In 2014, the water level in Piezometer IC1037OR increased by over 11 feet <br /> between January and June consistent with the heavy snow pack observed that year. <br /> Piezometer IC10360 is also located near Piezometer 10370R but does not intersect the <br /> Indian drainage. This piezometer had a maximum water level increase of 6.2 feet in 2017, <br /> r compared to 8.8 feet in 2016, 6.5 feet in 2015, and 7.7 feet in 2014. The relatively consistent <br /> increase between the water level rise in 2014 and more recent observations may be <br /> attributed to the location being outside of the Indian drainage under the Indian Rock Dump. <br /> r "10600-10400"Level <br /> Site Description: Identical to that of past reports for 1996 through 2016. <br /> ' 2017 Observations: Piezometer IC10440 was used to monitor subsurface water levels in <br /> this area of the rock dump until it became non-functional in 1996.Piezometer IC10525, <br /> r which is also representative of this area of the rock dump, is described below in Section <br /> "10725- 10525" Level. <br /> "10650-10600"Level <br /> ' Site Description: Identical to that of past reports for 1996 through 2016. <br /> 2017 Observations: Piezometers IC10630 and IC10600 monitor subsurface water in this <br /> r area of the Indian Rock Dump. The water elevation in Piezometer IC10630 rose by 7.0 feet <br /> from March through June consistent with levels measured from 2014 through 2016 (7.5 to <br /> 7.6 feet). The response to spring snow melt and/or summer rain events is consistent with <br /> other rock dump piezometers. However, until 2014, Piezometer IC10630 was characterized <br /> by minimal water level change (maximum water level rise of 4.5 feet and average 1.3 feet). <br /> As noted in previous reports, in October 2001, an obstruction was removed from Piezometer <br /> IC10600, which subsequently allowed it to be used for the collection of water level data. In <br /> 2017, the water level in Piezometer IC10600 increased by 8.4 feet during the spring freshet <br /> which is consistent with 2015 and 2016 high water levels (8.8 and 8.4 feet, respectively). <br /> During the same period in 2014, the water level elevation rose by 11.8 feet. <br /> "10780- 10660" Level <br /> rSite Description: Identical to that of past reports for 1996 through 2016. <br /> 2017 Observations: Visual inspection of the area revealed no evidence of settling or <br /> slumping of the rock dump material. The drainage channels are functioning as designed. <br /> r "10725- 10626" Level <br /> r Site Description: Identical to that of past reports for 1996 through 2016. The minor overlap <br /> between this level and other bench designations reflects the original bench configuration. <br /> 2017 Observations: Piezometers IC10600 and IC10525 are used to monitor subsurface <br /> ' water in this area. Similar to Piezometer IC10600, in 2017 the Piezometer IC10525 water <br /> level rose by 8.2 feet in response to spring snow melt, consistent with the water level rise <br /> observed from 2014 through 2016 (7.9 to 9.0 feet). <br /> ' 10800"Level <br /> Site Description: Identical to that of past reports for 1996 through 2016. <br /> ' Pitch Reclamation Project Page 4 <br /> 2017 Annual Geotechnical Report <br /> M-1977-004HR <br /> 1 <br />