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2007-11-07_HYDROLOGY - M1977300
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2007-11-07_HYDROLOGY - M1977300
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Last modified
8/24/2016 3:18:19 PM
Creation date
12/3/2007 4:13:29 PM
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Template:
DRMS Permit Index
Permit No
M1977300
IBM Index Class Name
HYDROLOGY
Doc Date
11/7/2007
Doc Name
Hydrologic evaluation of mine closure & reclamation
From
Whetstone Associates
To
Cotter Corpoartion
Media Type
D
Archive
No
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34 <br />Schwartzwalder Mine -Hydrologic Evaluation of Mine Closure and Reclamation <br />l'he inflow history of the mine indicates that the majority of groundwater flows are associated with <br />localised structural features including the West Rogers and Illinois Fault Zones and pegmatite dikes. <br />Sinkint; of the Parker Winze. (now called the #I Shaft) reportedly encountered very little water until about <br />2>0 feet deep. 'The #2 Shaft was completed to the 1,200 Level without -najor intlows before drifting and <br />drilling on the 1.100 Level encountered significant water associated with pegmatites and the lllinois fault <br />system (Cotter, 2000). The #3 Shaft encountered large intlows (600 gpm) on the 1,800 Level which were <br />associated with pegmatites. Drilling on the 1,800 and 1.900 Levels near the #3 Shaft also ti~und the <br />pegmatites to he water bearing. Plugging of the boreholes on the 1,800 and 1,900 levels in 1994 reduced <br />the short-term intlow to the mine from about 310 to 140 gpm. Significant groundwater was also <br />encountered by drilling on the west end of the 1,600 level which penetrated the footwall of the West Rogers <br />Fault. Fhe deepest ~>orkings of the mine ~~ere dry except for minor water associated with the 21 Vein, a <br />conjugate fracture in the hanging wall of the West Rogers Fault (Cotter, 2000). <br />~?.3 Oh.~c-n•c~cl Rote uf~,tiline Fluncli~~g <br />Water level measurements have been recorded in the mine shafts since the mine started flooding in May <br />2000 (Figure "' I ). The rates of water level rise have decreased over time, with rather distinct inflection <br />points in the rate of refilling (Figure ''?). <br />During the initial flooding of the 1,900 and 1,800 levels. the mine pool rose at an average rate of ~.7 feet <br />per day (Table li). Flooding of the 1,700 through mid-1,000 levets occurred at a slower rate with water <br />levels rising at an average rate of'_.4 feet per day. The mine pool rose at a fairly consistent rate of 0.66 feet <br />per day from June 2001 to June 2003, and 0.38 tt/day from September 2003 to October 2004. Rates slowed <br />to 0.29 tt/day tFom October 2004 to .luly 2006, and 0'0 ft/dav from June 2007 to Jul}' '007 (Table 15. <br />Figure 22). l~he rate of rise slowed further (to 0.018 tt/day) from September to October 2007. <br />ssoo - - - - <br />Bsoo <br />s4oo <br />6200 j <br />s~eb Levu <br />X00 l evel- <br />6000 • <br />n -•800 Level- <br />p 5600 <br />Q <br />z <br />c 5600 <br />~ -7100 Level- <br />w <br />o ~~ <br />W <br />5200 <br />5000 I -1500 Level- <br />4800 <br />4600 ,, --1900 Level- <br />4400 -_. _- - ..-,_. ~-._-_ .-`-_ .---.-. W;-OM1 Jen-US Ju405 Jan~05 .h.O.Ck? Jan-Oi .~u~.117 <br />Jan-00 Jul-00 Jan-01 Jul-Ot Jan-02 Jul-02 Jan-03 Ju1~03 Ja^-iia <br />Figure 21. Observed Water Levels in the Schwartzwalder Mine During Reblling <br />Whetstone Associates • <br />41091~.071I16 <br />
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