My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2007-05-21_REVISION - M1980055HR
DRMS
>
Day Forward
>
Revision
>
Minerals
>
M1980055
>
2007-05-21_REVISION - M1980055HR
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
6/15/2021 5:55:41 PM
Creation date
11/21/2007 1:30:17 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980055HR
IBM Index Class Name
Revision
Doc Date
5/21/2007
Doc Name
Conversion of the Topaz
From
Denison Mines
To
DRMS
Type & Sequence
CN1
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.
/
63
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
requirements and which are designed to provide adequate protection to the environment, the <br />public, and the mine work force. <br />Surface Drainage Control Structures -Disturbances to existing drainage systems were avoided to <br />the extent possible daring the design of the surface facilities layout. Two permanent diversion <br />channels currently exist uphill of the portal area to direct stonnwater runoff around the surface <br />facilities to the east and west sides of the portal area. These diversions direct surface water runoff <br />into two ephemeral drainages located on the east and west sides of the surface facilities area. The <br />channels are intended to minimize the volume of runoff that will flow down the WRA slopes <br />during both active mine operations and the post-reclamation period. A 100-year, 6-hour storm <br />event was used to evaluate the sizing of these existing channels and ensure that they will be of <br />sufficient size to permanently divert water around the mining area following mining activities and <br />reclamation. These diversion ditches are large enough to contain a 100-year, 6-hour storm event; <br />however, minor modifications in slope and alignment will be made to lower the flow velocity in <br />the channels. <br />Sediment control measures including an earthen berm and a catchment basin will be located along <br />the base of the expanded WRA. A second berm will be located at the top of the WRA to prevent <br />surface water from flowing into the WRA from the mine surface facilities area. The berms and <br />catchment basin were designed to discharge a 100-year, 24-hour storm event via an emergency <br />overflow spillway located on the west side of the catchment basin. An emergency overflow for a <br />100-year storm is included for the catchment basin and discharges during a 100-year storm to the <br />ephemeral channel located west of the catchment. The catchment basin and berms will be <br />reclaimed after the mine is closed. <br />Other sediment control devices, such as earthen berms and straw bale barriers, will be placed <br />downgradient from disturbed areas as necessary to minimize the volume of sediment impacting <br />the drainage system. <br />Solid Waste Disoosal -Aseptic system is located west of the maintenance shop; however, this <br />system will not be used during future mining operations. A portable toilet will be provided for <br />use during mining activities and will be maintained by a mine contractor. Small quantities of <br />inert solid waste (rubble and debris), as defined by the Colorado Mined Land Reclamation Act, <br />will be disposed of in the WRA during mine operations. Debris will be buried in parts of the <br />WRA that will not be subject to exposure or erosion during or after reclamation. All other solid <br />5-18-2007 Exhibit D Mining Plan D-9 <br />
The URL can be used to link to this page
Your browser does not support the video tag.