2012-07-25_REVISION - M1997342

• Permit No: M1977342
• IBM Index Class Name: REVISION
• Doc Date: 7/25/2012
• Doc Name: TR-16 APPROVAL
• From: DRMS
• To: CLIMAX
• Type & Sequence: TR16
• Email Name: PSH
• Email Name: TAK
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
July 25, 2012
Mr. Miguel Hamarat
Climax Molybdenum Company
Henderson Mill
P.O. Box 68
Empire, CO 80438
Groundwater Management Plan
STATE OF COLORADO
COLORADO
D I V I S I O N O F
RECLAMATION
MINING
—&—
SAFETY
John Hickenlooper
Governor
Mike King
Executive Director
Loretta Pineda
Director
Re: Climax Molybdenum Company, Henderson Mine, Permit No. M- 1977 -342
Technical Revision Approval, Revision No. TR -16
Dear Mr. Hamarat:
On July 25, 2012 the Division of Reclamation, Mining and Safety approved the Technical Revision
application submitted to the Division on April 27, 2012, addressing the following:
The terms of the Technical Revision No. 16 approved by the Division are hereby incorporated into
Permit No. M- 1977 -342. All other conditions and requirements of Permit No. M- 1977 -342 remain
in full force and effect.
Henderson may commence the process of conducting further groundwater studies at the Mill to
determine the following:
• The appropriateness of MLGW -7's current location and the rationale for or against a
nested well at this location.
• The appropriateness and recommended location of a POC well below 3 -dam and the
rationale for or against a nested well at this location.
• The appropriateness and recommended location of a POC well in the Potato Gulch
drainage and the rationale for or against a nested well at this location.
The Division will require Henderson to submit the results of the further groundwater studies for
Division review following their completion. Additionally, the Division will require Henderson to
submit the results of the baseline parameters and Numeric Protection Levels (NPLs) assessments
for the POC Wells for Division review and approval as stated in the technical revision.
Office of Office of
Mined Land Reclamation
Denver • Grand Junction • Durango Active and Inactive Mines