2017-08-22_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 8/22/2017
• Doc Name: Written Spill Notification
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

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NEWM NT,
August 17, 2017
RECEIVED
AUG 2 2 2017
DIVISION OF RECLAMATION
MINING AND SAFETY
Newmont Mining Corporation
L 16,pple Creek 8 Victor Gold Kline
100 North 3" street P Q Box 191
T 719-689-4049
F 719-689-3254
uvrvw.rewmart.com
SENT CERTIFIED, RETURN RECEIPT REQUESTED
^015 1660 0000 0779 9581
Mr. Timothy Cazier, P.E.
Environmental Protection Specialist
Colorado Department of Natural Resources
Division of Reclamation, Mining and Safety
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203
R7PermitNo. M-1980-244; Cripple Creek & Victor Gold Mining Company (11CC&V11): Cresson Project
—Written Spill Notification — Processed Ore Thickener Overflow Tank Spill — August 10, 2017
Dear Mr. Cazier:
In accordance with Rule 8, Section 8.2.3 of the Mineral Rules And Regulations of the Colorado Mined Land
Reclamation Board For Hard Rock, Metal, And Designated Mining Operations (Rules), the Cripple Creek and
Victor Gold Mining Company (CC&V) hereby provides the Division of Reclamation, Mining and Safety
(Division) with a formal report regarding the spill of neutral pH water from the Processed Ore Thickener
Overflow Tank at the High Grade Mill (HGM), which occurred late morning August 10, 2017.
The following points address the requirements of Rule 8, section 8.2.3:
a. Actions taken to respond to and correct the emer2ency situation or condition
a The Spill was observed by mill operators and electricians preforming ground checks on the Processed
Ore Thickener Tank pumps.
Electricians shut down pump 46-A to perform a ground check on the motor and failed to restart pump
46-A prior to shutting down pump 46-B to perform a ground check. The pumps are paraIleI to one
another, only one pump is needed to control flow from the processed ore thickener tank. The other
pump is a redundant backup. With both pumps shut down the processed ore thickener tank quickly
over flowed, and neutral pH water went into the processed ore thickener overflow tank. Once the
capacity of the processed ore thickener overflow tank was exceeded, neutral pH water flowed down
the overflow pipe into secondary containment. The overflow pipe slightly points towards the
secondary containment stem wall. When the neutral pH water came out of the overflow pipe the water
hit the stem wall; the water splashed out of containment, thus spilling approximately 250 gallons of
neutral pH water. The secondary containment structure only filled to about 5% (visual estimate) its
capacity and did not over top.
Pump 46-A was immediately restarted, when the overflow was observed. It took a few minutes for
the pump to catch up. The entire event occurred over the course of approximately 10 minutes.