2024-05-17_REVISION - M1977493

• Permit No: M1977493
• IBM Index Class Name: Revision
• Doc Date: 5/17/2024
• Doc Name: Exhibit E - Reclamation Plan
• From: Climax
• To: DRMS
• Type & Sequence: TR37
• Email Name: TJ1
• Media Type: D
• Archive: No

Permit M-1977-493—Climax Mine
E-11.3 Tailings Storage Facility Reclamation
E-11.3.1 Robinson Tailings Storage Facility
Robinson TSF reclamation began in the 1980s and is ongoing. The majority of the surface has been capped with
overburden rock and covered with biosolids or suitable soil material, and most of that area has been revegetated.
The biosolids production area is on the Robinson TSF and will be reclaimed once the existing biosolids are used
up. Areas of the TSF that are not bond released will be capped with a minimum of 24 inches of reclamation cover
material. Approximately 3% of the total TSF area, not including 200 feet offset from the crest or the bond released
areas, will be capped with a minimum of 48 inches of reclamation cover material to promote tree growth. In
addition, there are several roads on the surface of the Robinson TSF that are still required for production and
reclamation activities. These roads will remain until they are no longer considered necessary. The Robinson TSF
decant pool (also known as Robinson Pond)will be filled in with approximately 380,000 cubic yards of fill to
remove the pool and allow drainage off the TSF surface to the diversion channels to the east. For the purpose of
this closure update, reclamation cover soils will be used for this fill. Future tailings settlement may necessitate
maintenance filling of the TSFs in the future. A conceptual configuration of the final reclamation communities is
shown in Figure F-05 (Exhibit F)and the final configuration of water handling facilities is shown in Figure G-06
(Exhibit G).
E-11.3.2 Tenmile Tailings Storage Facility
The Tenmile TSF will be reclaimed when it is no longer required by the operation. As approved for Robinson TSF
in TR-13, the Tenmile TSF will be reclaimed with a dry cover. The majority of the surface will be capped, with
drainage directed toward the decant structure in the southwest corner of the facility. Areas of the TSF that are not
bond released will be capped with a minimum of 24 inches of reclamation cover material. Approximately 3% of the
total TSF area, not including 200 feet offset from the crest or the bond released areas, will be capped with a
minimum of 48 inches of reclamation cover material to promote tree growth. An emergency open channel spillway
will be constructed on the northeast side of the TSF in the event that the decant structure clogs. Excess rock
cover or soil material may be used as necessary to achieve TSF stability. A conceptual configuration of the final
reclamation communities is shown in Figure F-05 (Exhibit F)and the final configuration of water handling facilities
is shown in Figure G-06 (Exhibit G).
E-11.3.3 Mayflower Tailings Storage Facility
A portion of the Mayflower TSF will be reclaimed when it is no longer needed for production and reclamation
operations. However, the southwestern portion of the Mayflower TSF will be used for water treatment as long as it
is necessary to provide detention storage for the water treatment system (see Exhibit G: Water Resources). A
detention storage area and several sludge cells will remain on the surface of the Mayflower TSF. These areas will
receive closure cover once water treatment ceases at the site.
The Mayflower TSF will be reclaimed with a dry cover.Areas of the TSF that are not bond released will be capped
with a minimum of 24 inches of reclamation cover material. Approximately 3% of the total TSF area, not including
200 feet offset from the crest or the bond released areas, will be capped with a minimum of 48 inches of
reclamation cover material to promote tree growth. The methods of reclamation will follow those outlined for the
Tenmile TSF above. Reclamation cover for the Mayflower TSF reclamation will come from existing stockpiles near
the Mayflower TSF or materials stockpiled elsewhere. A conceptual configuration of the final reclamation
communities is shown in Figure F-06 (Exhibit F)and the final configuration of water handling facilities is shown in
Figure G-07 (Exhibit G).
E-11.4 Dam Reclamation
E-11.4.1 1 Dam and 2 Dam
Reclamation on 1 Dam and 2 Dam is complete. Both dam faces are covered, stabilized, and revegetated.
E-11.4.2 3 Dam and 5 Dam
As of 2024, 3 Dam and 5 Dam have been reclaimed to the extent possible in their current configurations.
However, a slight increase in the height of 3 Dam and a larger increase in the height of 5 Dam are planned as a
part of mineral extraction and production (see Exhibit D: Mining Plan). These new dam lifts will require
Exhibit E E-15 May 2024