2010-03-22_REVISION - M1977342

• Permit No: M1977342
• IBM Index Class Name: REVISION
• Doc Date: 3/22/2010
• Doc Name: Final Tailing Pond Hydrology Report and Barge Systems Project Reports.
• From: Climax Molyb
• To: DRMS
• Type & Sequence: TR14
• Email Name: ACS
• Media Type: D
• Archive: No

Climax ®Molybdenum
A Freeport-McMoRan Company
March 22, 2010 LIZ
&e--V
Hand Delivered
Mr. Allen C. Sorenson /
Division of Reclamation Mining and Safety i/
1313 Sherman St., Rm. 215
Denver, CO 80203
COLORADO OPERATIONS
Henderson Mill
P.O. Box 68
Empire, CO 80438
Phone [phone]
Fax [phone]
Re: Permit M-1977-342, R-14 Submittal of Final Tailing Pond Hydrology Report and -Barge_
System Project Reports
Dear Mr. Sorenson:
Climax Molybdenum Company (CMC) is pleased to submit the following documents related to Technical
Revision JR) 14 of the Henderson Reclamation Permit:
Final Tailing Pond Hydrology Report dated February 2005. This fulfills Stipulation No. 1 to TR-14;
and
Final Project Reports for the Barge System. This fulfills the requirement for a Final Project Report
in a letter to Mr. Tim Haynes of CMC from Allen Sorenson dated January 27, 2006.
Stipulation No. 1 was placed on the Henderson Reclamation Permit M-1977-342 on March 11, 2004 at
the time of TR-14 conditional approval, and reads as follows:
The DMG [DRMS] will require an analysis of the tailing impoundment considering occurrence of a 100-
year storm event followed four days later by the probable maximum precipitation event. It must be
assumed in this analysis that power to the mill will be unavailable during the days b/w (between) the two
flood events. Based on the results of this analysis, DMG may require an adjustment to the minimum
required flood storage capacity in the tailing impoundment such that overtopping of the dam will not occur
in the event of the sequence of storms under consideration. Implementation of adjustment to the
minimum required flood storage capacity, if determined to be necessary, will not be required until the
existing decant system is plugged and abandoned.
The January 27, 2006 letter accompanied the DRMS certification of the new barge and pipeline system
and allowed them to be put in to use but also required a Final Project Report and as-builts which are
included in this submittal.
The new mill water return pipeline (terminology used in TR-14 and in the approval letter of March 11,
2004) is now called the Barge Return Pipeline to avoid any confusion with the now abandoned Mill Return
Pipeline. The abandoned Mill Return Pipeline was fed by the Ute Park Pump Station and returned seep
water directly to the mill facility. The Ute Park Pump Station now feeds the Seepwater Return Pipeline
which returns seep water directly to the tailing impoundment.
CMC believes that this submittal will fulfill the requirements included in the TR-14 approval letter.
Submittal of the twice annual flood storage capacity analyses in Stipulation No. 2 is an ongoing