HYDRO22014

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Date: 6/6/1995
• Doc Name: DISCUSSIONS HELD REGARDING COMMITMENTS 29 30 11 AND 16
• From: DMG
• To: CRIPPLE CREEK AND VICTOR GOLD
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenl of Natural Resources
131 J Sherman 51., Room 21 5
Denver, Colorario 80203
Phone: [phone]
FAX: [phone]
June 6, 1995
Ulh~~
DEPARTMENT OF
NATURAL
RESOURCES
Roy Romcr
Governor
Mr. John Hardaway IamesS Lo<hheaA
Manager Environmental Affairs Erecuhve Dueclor
Cripple Creek and Victor Gold Michael8 Loni;
Division Direcmr
P.O. Box 191
victor, CO 80860
RE: Discussions Held Regarding Commitments (9)29, (10)30, 11(31), and
16(36)
Dear Mr. Hardaway:
On May 30, 1995 a meeting was held at the Division to resolve some ambiguity in
the language of commitments 9(29), (10)30, 11(31), and 16(36). Present at the
meeting were yourself, Mr. Jim Komadina, and Bob Micassik from Cripple Creek
and Victor Gold Mining Company. Mr. Berhan Keffelew, Mr. Michael Long,
Mr. Bruce Humphries, Dr. James Pendleton, Dr. James Stevens, and
Dr. Harry Posey were present from the Division.
The discussion concentrated on how to properly define what will determine a
loss of containment of the leach pad facility by the Division which is agreeable
to the operator based on some numeral standard.
When the permit amendment was approved in April of 1994, the Division agreed
to allow the placement of the iron clad clay liner in the amendment area with
.5 mg/1 of WAD cyanide.
It was agreed upon by the Division and the operator that a trend that shows
.5 mg/I exceedence in association with the volume of solution above baseline
and a rise in pH above baseline should be used as an indicator of leach pad
facility loss of containment. For e.g., a cyanide concentration in the LDS sumps
that is in excess of the allowable concentration (.5 mg/U does not necessarily
mean a loss of containment and that a response by the operator is warranted.
In order to trigger a response, the pH and the allowable leakage rates will also
have to exceed baseline levels or rates.
The Division and the operator's representative agreed to collect baseline water
quality information, which at a minimum; must include the following
parameters:
1. pH
2. WAD cyanide
3. Free cyanide