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2012-03-12_REPORT - C1982056 (2)
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2012-03-12_REPORT - C1982056 (2)
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Last modified
8/24/2016 4:55:04 PM
Creation date
3/12/2012 10:47:19 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
3/12/2012
Doc Name
2011 Annual Hydrology Report (1 of 2)
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2011
Permit Index Doc Type
Hydrology Report
Email Name
JDM
DIH
Media Type
D
Archive
No
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access to the 6 Rt and 7 Rt gate roads. Thus, no measurements are available in this area for 2006. Historical data <br />is available in previous AHRs. The last flows measured for 2000 showed seasonal variations, with an average <br />annual flow of approximately 65 gpm. The EMD was monitored periodically at the l ORT well shaft during 2011. <br />Northern Mining District (NMD): At the time of the 2010 inflow study, the mine operation had completed the 23 <br />Rt panel. The primary sources of water came from the two most recent shafts in the 6MN area, and two fault <br />crossings. Total inflow was estimated to be on the order of 80 gpm. Inflows continued in the Northeast <br />Submains, although there appears to be a continued decrease in ceiling dripping. The highest inflows were about <br />20 gpm for the new 6MN shaft, and about 15 gpm from a floor sump at inflow site 8 (IF8) with a conductivity of <br />2270 (Trout Creek Water). This may have been impacted by the addition of roof drip collection to the sump <br />system. The next highest inflow was at raise bore area (IF 38 and IF 37), which was on the order of 10 -gpm <br />(down from an estimated 20 gpm in 2005), Field conductivity measurements were about 1500 umhos /cm. This <br />site is a blend of Wadge and Twentymile Sandstone water. Inflow at the remaining sites (primarily roof drippers) <br />were either dry or significantly lower, often less than a gallon per minute. <br />New Western Mining District (WMD): The 2011 inspection along the newly completed 17LT and 18LT gate <br />roads indicated estimated inflows of 15 to 20 gpm. The majority of sites were modest roof drippers, with sites 55 <br />and 57 exhibiting the highest flows, both on the order of 1 to 2 gpm. The majority of the drippers seen in 2010, <br />had dried up. <br />3.9 Water Balance <br />In early 2009, TC conducted a water balance study to better access water use and allocations for mine operations, <br />as well as mine dewatering. A flow chart was provided in the 2009 AHR, illustrating water movement for the <br />mine in early 2009. Note that there have been some changes in flow patterns since this study. Another mine <br />water balance is anticipated to be performed in 2012, which would be reflected in the 2012 AHR. <br />4.0 SUBSIDENCE IMPACTS <br />Fish Creek: Historically, hydrologic monitoring of potential subsidence impacts from the earlier 17 and 18 - <br />Right Panels utilizes four alluvial wells and four nearby surface sites. These sites are shown on the attached First <br />Half 2008 Subsidence Map. These include alluvial well AVF -14 and associated surface site SW -14 (upstream of <br />17 -Right subsidence zone). Also utilized are alluvial well 008-AU3 and associated surface Site 305 (downstream <br />of 17 -Right subsidence zone). Note that sites 305 and 008 -AU3, were designated under TR03 -42 as downstream <br />subsidence monitoring sites. <br />Alluvial well AVF -15 and associated surface site SW -15 are located between the two sets of upstream and <br />downstream sites, presently within a ponded subsidence zone. Localized ponding occurred in this area in <br />September /early- October of 2004. The creek bed flow path subsequently reestablished itself. <br />A portion of Fish Creek was last subsided in 2006. In that year, a short segment of Fish Creek crossed <br />approximately 160 feet into the zone of anticipated subsidence (based on the subsidence limit line) along the <br />16 <br />
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