2012-09-06_REVISION - M1977493

• Permit No: M1977493
• IBM Index Class Name: Revision
• Doc Date: 9/6/2012
• Doc Name: One site Landfill Location Addendum TR-22
• From: Climax Molybdenum
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

Climax Molybdenum
A Freeport- McMoRan Company
Sent by Certified Mail
September 5, 2012
A. Eric Scott
Environmental Protection Specialist
Division of Reclamation, Mining and Safety
Department of Natural Resources
1313 Sherman St. Room 215
Denver, Colorado 80203
7WZ:2
Climax Mine
Highway 91 - Fremont Pass
Climax, CO 80429
Phone [phone]
Fax [phone]
ECEIVED
`'SEEP 0 6 2012
Division of F7eclamation,
Mining & Safety
RE: On -Site Landfill Location Addendum to Technical Revision 22 — OSF Designs and
O &M Plan, Climax Mine Permit No. M-1977-493
Ve
Dear Mr. Scott,
This letter and attachments are an addendum to Technical Revision (TR) 22 — OSF Designs and
O &M Plan. The addendum provides information regarding a new location on the North 40 OSF for
the Climax Mine solid waste landfill to accommodate materials mined in the Open Pit from former
underground workings. As part of its ongoing mining operation, Climax will be encountering
former underground mine materials (e.g., concrete, steel rails, rock bolts, wood cribbing, ties, etc.) as
we approach the bottom of the open pit. Climax estimates that up to several hundred thousand tons
of this material may be encountered during operations. Segregating these materials from the ore will
be very difficult and we are concerned with damaging our primary crusher should any underground
mine materials remain in the ore feed.
Rather than risk serious damage to our processing equipment, Climax will stockpile the mixed
ore /underground mine materials as part of our North 40 OSF solid waste landfill. This mixed
material will be placed in an interior portion of the North 40 OSF below the Open Pit Shop as shown
on the attached figure. We estimate the total amount of mixed ore /underground materials that may
be permanently located in this area to be between 1.6 and 2.4 million tons. Placing the mixed
material in this area eliminates stability concerns since this portion of the North 40 will eventually be
buttressed by subsequent OSF placement. It also will not change the overall OSF designs or
reclamation plans as described in TR 22. Lastly, this location provides a working area (away from
active dumping in other OSF areas) should we attempt to salvage any of the ore.
As underground materials are encountered during mining, Pit Operations will segregate any material
that is not compatible with the solid waste landfill (e.g., electrical equipment, containers, oily
material, etc.) before stockpiling the mixed material at the North 40 OSF site. We have revised the
Climax pit operation SOP (attached) describing the procedure to be followed to ensure we segregate
non - landfill materials for appropriate, off -site disposal.