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HYDRO21764
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HYDRO21764
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Entry Properties
Last modified
8/24/2016 8:43:02 PM
Creation date
11/20/2007 2:30:56 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Hydrology
Doc Date
10/26/1999
Doc Name
MEMO EAGLE 5&9 MINES PN C-81-044 PR RN-03 ITEM 44 OF CDMGS LETTER OF 06/09/1998
From
DMG
To
DAN HERNANDEZ
Permit Index Doc Type
PROF POND CERTIFICATIONS
Media Type
D
Archive
No
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<br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman 8L, Room 215 <br />DIVISION O F <br />Denver, Colorado 80'.03 M I N E R A L S <br />Phone: (7031 8667567 <br />FA`(: 170]1 832-8106 ~ & <br />MEMO GEOLOGY <br /> R E C L A M A T I O N <br /> MINING•SAFETY <br />Date: October 26, 1999 <br />' <br /> <br />K <br />F <br />K <br />ld <br />b <br />T <br />h B,II Owens <br /> <br />Coeernar <br />rom: <br />a <br />en <br />ac <br />om Greg E Watcher <br /> Executive D~reaor <br />To: Dan Hernandez Michael B. Long <br /> Division Director <br />Re: Eagle 5 & 9 Mines, Permit C-81-044, Permit Renewal RN-03 <br />Item 44 of CDMG's letter of June 9, 1998 <br />Please let me know whether or not you agree with my conclusion at the end of this memo. <br />On October 25, 1999 Rick Mills asked me by phone if it is necessary, as I:he Division requires in <br />Item 44, to submit an as-built certification for the 20-year old pond 9-P1 ,given the original <br />function of the pond as a mine dewatering pond (rather than a sedimentation pond) and given the <br />historical minimal inflows into the pond. <br />I researched the permit application and our files, and found the following information. <br />1. Drawing DWG. N-36 in the permit application shows pond 9-P1 to be the first in a <br />series of four ponds that would have received dischazge from the portals of Mine 9. <br />Active mining of Mine 9 permanently ceased in 1985 and the portals have been sealed. <br />2. Drawing DWG. N-36 serves at least as a minimal as-built certification as it shows <br />minimal design features of pond 9-P1 and bears a PE stamp with signature and a <br />statement "Conswction complete on June, 1979 as per this desie;n'". <br />3. A letter from Cyprus Empire to the Division, dated July 19, 1989 (in our Pond <br />Certifications file) explains that pond 9P-1 was originally part of the Mine 9 dewatering <br />system. <br />4. Cyprus' quarterly pond inspection reports back to 1993 show pond 9-P1 to be a mine <br />dewatering pond. (Older reports are archived.) <br />5. The pond reports show this 6.6 acre-foot pond to have held two feet of water in Spring <br />1994 and Spring 1996, and one foot of water in Spring 1995. It was dry at all other <br />times. <br />6. The pond's drainage area is 36.4 acres (SEDCAD run in Exhibit 18, page 116 of permit <br />application). <br />
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