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2018-08-31_GENERAL DOCUMENTS - M1977493
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2018-08-31_GENERAL DOCUMENTS - M1977493
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Last modified
8/31/2018 1:06:24 PM
Creation date
8/31/2018 1:02:47 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
General Documents
Doc Date
8/31/2018
Doc Name
Revised Financial Warranty Update
From
Climax Molybdenum
To
DRMS
Permit Index Doc Type
General Correspondence
Email Name
JLE
ECS
MAC
Media Type
D
Archive
No
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2016 Reclamation Cost Estimate Update — Climax Mine <br />2 Site Specific Reclamation Planning <br />As specified in the permit amendment AM -06, specific reclamation strategies have been outlined for all <br />areas of the mine. This narrative describes reclamation plans for all areas including the Open Pit, the 4 <br />tailing dams, the 2 Overburden Storage Facilities (OSFs), and the 3 Tailing Storage Facilities (TSFs). It <br />also refers to the long-term strategy for site -wide water management and demolition of structures upon <br />cessation of mining. Attached Figures 1 and 2 have been utilized as the basis for the proposed final <br />reclamation design and illustrate the final facility layout with respect to post -mine land use. Since the <br />approval of AM -06, four key Technical Revisions (TRs) have been approved, TR -21, -22, -24 and -25 for <br />which closure components have been included herein as part of this reclamation cost update. <br />2.1 Storke Complex <br />Most of the Storke Complex has already been reclaimed. Thus, the only remaining work includes hauling <br />and spreading approximately 5,000 cy of biosolids from the Robinson Staging Area to cover 10 acres of <br />remaining disturbance at about 4 -inches thick. <br />The AM -06 cost for this project area included reclamation of a potential OSF on Ceresco Ridge. This OSF <br />is no longer planned (per TR -22) so the cost for its reclamation including the construction of a seepage <br />collection system at its toe has been eliminated. <br />2.2 Open Pit <br />The open pit will not be revegetated due to accessibility and safety concerns. The final slopes will likely <br />remain at an angle of repose (approximately 1.5H:1V). Weathering, raveling, and ice action will cause <br />natural reshaping of the benches and highwalls over time which will soften visual impacts. Administrative <br />controls will be maintained to control public access via approximately 40 "No Trespassing" signs which <br />will be installed approximately every 300 feet around the perimeter, where access is reasonable. <br />On the margins of the pit, where slopes are less steep, some revegetation may be possible (per DRMS <br />requirement). In these cases, up to an estimated 27,000 cy of topsoil will be hauled from the McNulty <br />OSF topsoil stockpiles to the open pit periphery and revegetated with the upland seed mixture. <br />The AM -06 cost for this project area included the installation of a 2,800 If pipeline as part of a pit <br />dewatering system. Climax will construct a pit dewatering system as part of production operations and it <br />will remain in place after mining ceases (per TR -24), therefore the post mining cost for this item has been <br />eliminated. <br />2.3 Mine Mill Complex <br />The Mine Mill Complex area will be regraded and reclaimed. As such, approximately 229 acres will be <br />regraded for a total of 370,000 cy. This area will then be covered with a minimum of 12 inches of biosolids <br />or topsoil and revegetated with the upland seed mixture. Biosolids will be hauled from the Robinson <br />biosolids staging area or topsoil will be hauled from the McNulty OSF topsoil stockpiles. <br />The AM -06 cost for this project area included an incorrect cost basis for the cover thickness which was <br />not consistent with the reclamation plan described in Exhibit E. This update reflects the corrected cost <br />basis and calculation. <br />2.4 North 40 OSF <br />The lower portions of the North 40 OSF may be reclaimed concurrently with production, but final <br />reclamation will not be completed until the OSF is no longer required for production or reclamation <br />operations. Final regrading of the OSF will be no steeper than 2H:1V interbench (per TR -22) with some <br />areas considerably less steep, for a total of approximately 520,000 cy. <br />Subsoil and topsoil to be salvaged from the ultimate footprint of the McNulty OSF will be stockpiled to the <br />immediate north of the North 40 OSF. In accordance with Exhibit E of AM -06 an estimated 260,000 cy of <br />topsoil and/or biosolids will be hauled and placed over the regraded surface for a total of 12 inches of <br />growth medium to be revegetated with the upland standard seed mixture. <br />November 2016 (revised August 2018) <br />
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