My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2012-01-23_REVISION - M1981021
DRMS
>
Day Forward
>
Revision
>
Minerals
>
M1981021
>
2012-01-23_REVISION - M1981021
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
6/15/2021 2:25:36 PM
Creation date
1/27/2012 8:10:28 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1981021
IBM Index Class Name
REVISION
Doc Date
1/23/2012
Doc Name
Final EPP wit Constr. Schedule.
From
Denison Mines
To
DRMS
Type & Sequence
AM1
Email Name
RCO
SSS
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
79
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
C \Users\cwoodward\Desktop \Sundays \FINAL - Environmental Protection Plan Sunday Mines Revised January 2012 docx <br />Section 7 <br />Groundwater Information <br />• The direction of groundwater flow in the area of the Sunday mine <br />underground workings has been into the mine during periods of active <br />dewatering prior to 1991 and during recovery of the water table since 1991 - -it <br />is unknown if groundwater is still flowing into the Sunday mine; and <br />• The direction of groundwater flow in the areas of the Topaz, Carnation, and <br />St. Jude mines is currently unknown. <br />Mine water pumped from the underground mines is not pumped to the surface and <br />discharged. All of this water is used within the mines for dust control and drilling <br />purposes. It is currently thought that this water evaporates and is exhausted from the <br />mine in the ventilation circuit. This process can result in removal of large quantities of <br />water from underground mines (Younger et al. 2002). This process causes the <br />underground mines to act as a local groundwater sink, which causes local <br />perturbations in the regional groundwater gradient. Mine dewatering ceased in June <br />2008; the mines are currently in temporary cessation status.. <br />The most recent phase of mine dewatering at the West Sunday Mine started in early <br />2008. The rate of dewatering is estimated to be 400 gallons per day (approximately 0.3 <br />gallons per minute) (S. Davies, West Sunday Mine Foreman, personnel <br />communication 2008). Prior to the most recent phase of mine dewatering, the water <br />level in the West Sunday mine was approximately 5,438.1 ft. above mean sea level <br />(amsl). Dewatering at a rate of approximately 0.3 gallons per minute for a period <br />extending from early 2008 to the present has resulted in lowering of the water table by <br />approximately 14 feet to the current level of approximately 5,424.2 ft. amsl. <br />Water within the Sunday Mine has not been pumped since approximately 1991 (J. <br />Fisher personal communication 2009). During the period of 1991 to the present, the <br />volume of water that has flowed into the mine is approximately 55.4 million gallons. <br />This equates to an average inflow rate of approximately 5.8 gallons per minute over <br />the past 18 years. The rate of inflow into an underground mine after cessation of <br />pumping is fastest immediately after pumping stops and slows as the mine water <br />table approaches the elevation of the surrounding water table (Wolkersdorfer 2006). It <br />is currently unknown if groundwater is continuing to flow into the Sunday mine. <br />Although water has not been pumped from the Sunday mine since 1991, it is likely <br />that evaporative losses of water from the Sunday mine have continued to occur <br />during intermittent periods of active mining and associated ventilation during the <br />period of 1991 to the present. <br />A small zone of groundwater inflow is also present in the lower portion of the <br />Carnation Mine, and water is not reported in the St. Jude mine. Groundwater is <br />reported to be flowing into the Carnation mine in this area, but the rate of inflow is <br />currently unknown. <br />Observed groundwater elevations in the base of the Topaz mine are approximately <br />140 feet higher than groundwater elevations in the area of the interconnected West <br />Sunday /St. Jude /Carnation /Sunday underground workings. The Topaz mine is not <br />7 -6 <br />
The URL can be used to link to this page
Your browser does not support the video tag.