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2021-12-07_REVISION - M2012032 (21)
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2021-12-07_REVISION - M2012032 (21)
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Last modified
12/7/2021 11:13:38 AM
Creation date
12/7/2021 10:49:07 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2012032
IBM Index Class Name
Revision
Doc Date
12/7/2021
Doc Name Note
Exhibit E: Reclamation Plan
Doc Name
Proposed Revision Materials
From
Ouray Silver Mines, Inc
To
DRMS
Type & Sequence
AM2
Email Name
LJW
THM
Media Type
D
Archive
No
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3 RECLAMATION AREAS <br /> The following sections describe the different reclamation areas for the site. <br /> 3.1 Tailings Storage Facilities <br /> The Revenue Tailings Storage Area(TSF) and Atlas TSF will be used concurrently to <br /> allow for safe winter operation. Existing topsoil reserved for reclamation will be stored <br /> in the indicated topsoil storage areas (Map F-1). Each TSF will be capped with a <br /> minimum of 6 inches of topsoil in designated areas on the surface of the TSF and will be <br /> revegetated as shown on Map F-1. The final slope of the TSFs will be 3H:1V, where <br /> practicable. If needed, the final slope configuration may be a maximum of 2H:1V. The <br /> stability of 2H:1V slopes was demonstrated in a geotechnical analysis by Lewicki and <br /> Associates that was provided in Exhibit T of Amendment 1 to the permit and <br /> resubmitted to DRMS as Attachment 3 of TR15. This analysis included characterization <br /> of the planned filtered tailings as received from the mill, compaction test results and field <br /> compaction requirements, cold weather management plan, and ultimate planned pile <br /> configurations. Geotechnical laboratory testing and additional compaction and direct <br /> shear tests were conducted on filtered tailings, and estimated material properties were <br /> used to compute stability of the tailings stack using the SLIDE program. The analysis <br /> results indicate a factor of safety (FOS) of 2.17 under wet conditions. All cases analyzed <br /> have a FOS greater than the minimum 1.3 criteria. <br /> 3.2 Shafts <br /> As described in Exhibit D, there will be three ventilation shafts as part of the Revenue <br /> Mine. The 960 raise, Yellow Rose Shaft, and the Monongahela (Hubb Reed) Shaft. <br /> Each of these shafts exit at the surface and therefore generate surface disturbance that <br /> will require reclamation, which will entail removing the concrete foundation around the <br /> opening, placing dismantled equipment downhole, sealing the opening and capping <br /> with native rock materials or revegetating. <br /> Exhibit E Reclamation Plan E-4 <br /> Amendment 02 <br /> December 2021 <br />
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