My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2020-09-08_REVISION - M2012032 (2)
DRMS
>
Day Forward
>
Revision
>
Minerals
>
M2012032
>
2020-09-08_REVISION - M2012032 (2)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
12/28/2024 4:11:03 AM
Creation date
9/8/2020 9:31:29 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2012032
IBM Index Class Name
Revision
Doc Date
9/8/2020
Doc Name
Adequacy Review Response
From
Ouray Silver Mines
To
DRMS
Email Name
LJW
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
49
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
3.1 Tailings Storage Facilities <br /> The Revenue Tailings Storage Area(TSF)and Atlas TSF will be used concurrently to allow for <br /> safe winter operation. Existing topsoil reserved for reclamation will be stored in the indicated <br /> topsoil storage areas(Map F-1). Each TSF will be capped with a minimum of 6 inches of <br /> topsoil in designated areas on the surface of the TSF and will be revegetated as shown on Map- <br /> F-1. The final slope of the TSFs will be 3H:IV, where practicable. If needed,the final slope <br /> configuration may be a maximum of 2H:IV. The stability of 2H:1 V slopes was demonstrated in <br /> a geotechnical analysis by Lewicki and Associates that was provided in Amendment 1, Exhibit <br /> U. This analysis included characterization of the planned filtered tailings as received from the <br /> mill, compaction test results and field compaction requirements, cold weather management <br /> plan, and ultimate planned pile configurations. Geotechnical laboratory testing and additional <br /> compaction and direct shear tests were conducted on filtered tailings, and estimated material <br /> properties were used to compute stability of the tailings stack using the SLIDE program. The <br /> analysis results indicate a factor of safety (FOS) of 2.17 under wet conditions. All cases <br /> analyzed 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 Mine. <br /> The 960 raise, Yellow Rose Shaft, and the Monogahela(Hubb Reed) Shaft. Each of these <br /> shafts will exit at the surface and therefore will generate surface disturbance that will require <br /> reclamation, which will entail removing the concrete foundation around the opening, placing <br /> dismantled equipment downhole, sealing the opening and capping with native rock materials or <br /> revegetating. <br /> The first step in reclaiming the ventilation shafts is to excavate down approximately four to six <br /> feet around each opening and cutting the casing off from three to four feet below the ground <br /> surface. After removing the casing and concrete pad, the surface structures will be dismantled <br /> and placed down hole and each opening will be covered with a steel plate and sealed, upon <br /> which a six-inch concrete slab will be poured. The concrete slab will be covered with <br /> overburden or soil generated from the excavation. The volume of material required to backfill <br /> Exhibit E Reclamation Plan E-3 <br /> Technical Revision 11 <br /> September 2020 <br />
The URL can be used to link to this page
Your browser does not support the video tag.