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1995-06-16_REVISION - M1977378
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1995-06-16_REVISION - M1977378
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Entry Properties
Last modified
2/10/2021 6:27:12 AM
Creation date
6/25/2012 11:43:46 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
REVISION
Doc Date
6/16/1995
Doc Name
Issues- FAX.
From
DMG
To
AGO
Type & Sequence
TR14
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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SUNNYSIDE GOLD CORPORATION <br /> AN ECHO 13"COMPANY <br /> P.O. Box 177 .Silverton, CO 81433 <br /> Phone (303) 387-5533 .Telecopy (303) 387-5310 <br /> rrr1 <br /> March 25, 1993 <br /> MAR 3 U 1993 <br /> Mr . James Stevens <br /> Colorado Division of Natural Resources ���� �`" <br /> Division of Minerals and Geology <br /> 1313 Sherman Street, Room 423 <br /> Denver, CO 80203-2273 <br /> RE: File No. M-77-378 <br /> San Juan County <br /> Hydrological and Hydrochemical Studies, Sunnyside Mine <br /> Dear Mr. Stevens : <br /> Sunnyside Gold Corporation (SGC) commissioned studies to evaluate <br /> the concept of placing concrete plugs in the American Tunnel and <br /> Terry Tunnel. This concept is in the Sunnyside Mine MLR permit to <br /> be implemented upon final reclamation. The studies were performed <br /> by Simon Hydro-Search and consist of a general hydrology/water <br /> chemistry study of the Sunnyside Mine and surrounding area and an <br /> evaluation of the bulkheads (hydraulic and hydrochemical ) . These <br /> studies are enclosed for your information. <br /> A discussion of the study results is presented below: <br /> 1) The probable flow direction for groundwater after impoundment <br /> will be from the Sunnyside Mine area towards Cement Creek . <br /> This was the most probable flow direction before mining <br /> occurred. <br /> 2) The expected equilibrium mine pool elevation is in the <br /> vicinity of 11, 500 feet. If this is the case, any bulkhead <br /> design based on the topographic limit (Lake Emma elevation of <br /> 12, 210 feet) will have an additional factor of safety against <br /> failure due to reduced fluid load conditions (1 . 84 for the <br /> American Tunnel bulkhead, 25. 6 for the Terry Tunnel bulkhead <br /> and the F-Level and B-Level Brenneman bulkheads would not <br /> impound water giving an infinite factor of safety) . If mine <br /> flooding occurs as modeled , it will take approximately 10 <br /> years to reach 860 of equilibrium and well over 20 years to <br /> reach equilibrium. This model used a lower equilibrium level <br /> (11 , 370 feet) but should show the expected trend. <br />
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