GENERAL53080

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 4/16/1997
• Doc Name: FAX COVER CRESSON PROJECT PERMIT M-80-244 STATUS OF LOW VOLUME SOLUTION COLLECTION SYSTEM FOR
• From: CRIPPLE CREEK & VICTOR GOLD MINING CO
• To: DMG
• Media Type: D
• Archive: No

SQVT BY~ 4-17-97 1528 ~INDfPFn'DL7VCE MINING ~ 303 832 8106;# 2
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999
&V
April 16, 1997
Engltwood Office
P.O. Box 5078, 5251 DTC Parkway. Suite 700
Englewood, CO 80155
[phone] • FAX [phone]
SENT BY FACSIMILB AND
CERTIFIED RETURN RECEIPT REQUEST
P 289 926 711
Mr. Heenan Keffelew
Gnviroumcntal Protection Spaialist
Colorado Depattmem of Natural Rcsounes
Division of Mines and Geology
Office of Mirtetl Land Reclamation
1313 Sherman S[rtxt, Rtwm 215
Denver, Colorado 80203
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Referrnce: Cresson Project: Permit M-80-244: Stems of Low Volutrte Solution Collection Svstr_Ttt for Phase
II of Cresson Vallev Learn Facility. a
Dear Mr. ICeffelew;
For the past four weeks, in addition to subtuining momhly repons, the Cripple Cteelc & Victor Gtld Mining
Company ("CC&V") has been transmitting m the Office of Mined Land Reclamation ("OfFice") the most recent
tnc:uuretoents of flow rates for solution pumped from the Low Volume Solution Colltxtion Sys[em ("i•~'SCS") and
pregnant solution depths for the Phase II ama of dte Cresson Valley Lerch Facility. The purpose of ttis letter is
m sumrnarice the status of the Phase li LVSCS sod confirm the adequacy of the[ system to i;otnply wiG the design
approved by the Mittel Land Ralamatinn Board and the Office.
la the event the subject of this letter noels to be placed into context, the LVSCS is described. Th:re arc two
LVSCSs: one completed in 1994 for Phase 1 of the Cresson Valley Leach Pacility, and ope cornplcted in 1996 Cor
Phase II. The LVSCSs are two-pttrdp draitta~e systems, desiswed to ptttnp fluid from a gravel layer that is
constructed httween the two synthetic liners thaz underlie the entire area below the Pregnant Solution Areas. They
arc designazed "Low Volurpe Solution Collation Systems," or "LVSCS," because [hey carry small flaws in
comparison to the solution collection system constructed on Wp of rho upper-[ttos[ liner, which is called the High
Voltmtc Solution Collection System ("HVSC,S"). The LVSCS gravel layer in[o which the [wiu pturtps are installed
lays bt:twtx~n the lower composite claysynthctic liner ("double lima") and the upper synthetic liner. The purpose
of each sysum is to pump pregnant solution that may move tltro»gh the uppermos[ liner due w an imperfection in
that liner, to convey that fluid out oT'the LVSCS and, thus, away from the lower litter, and to thereby control and
minimize the fluid pressure that could otherwise occur on that lower liner. By minimizing the fluid pr•'ssuts on s
liner, Ute po[exttial for flow m oa:ur thmugh that liner, wltieJt, is the case of each LVSCS, is the !~wermoet
composite liner in the containrnem system, is also rniniatized. Funkier, removal of solution prevents s.: tration of
the LVSCS and, thus, redue.es dte potential for a saturated zone to oct•ur throughout the entire thicL' .ss of the
LVSCS gravid, which, if it occurred. would transmit the pressure Cram the overlying trolutnn of pregnr~t solution
to the lower contposiu liner.
The tnoniwring of the LVSCS constructed For Pharr II, through the recordt~ maintenance of low pret.sure heads
and observation of rile surging of pumped flow, shows that the existing pumping sysum is capable o-removing
solution at rates higher than those experienced to date. (Surging indicates that the pumps are removing fluid faster
than it is currently being supplied to the pumps.) blrrthtx awtxric analysis, discussed in this letter, shows that the
pumping systan also is capable of remmving solution at rates that should encompass and exceed those potentially
Glppl9 Creek & VlCtor Gold Mlnlnq ComPa~Y
A Jdnl vontuo -Pike Pack Minirp Company, Manaa~r
Opterotlons OFFies
P.O. Box 181, 2755 State Highway 67
Victor, CO 80880
[phone] • FAX [phone]