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2006-10-16_REVISION - M1987028
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2006-10-16_REVISION - M1987028
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Last modified
6/15/2021 6:05:59 PM
Creation date
11/22/2007 1:32:04 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1987028
IBM Index Class Name
Revision
Doc Date
10/16/2006
Doc Name
Response to Geotechnical Adequacy Review June 1 2006
From
Azurite Inc.
To
DRMS
Type & Sequence
CN1
Media Type
D
Archive
No
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crossing and directly adjacent to Taylor Gulch. The existing dump slope is app. 2:1. <br />Colorado Mazble requests a variance from the normal standazd of fmal slope grade for <br />this limited azea. Aggressive slope manipulation techniques (contour furrowing) will be <br />employed to stabilize the steep rocky slope and prepare it for re-vegetation. Final <br />reclamation of the tops of the waste rock piles will be to finish grade all slopes and top, <br />flatter areas utilizing contour furrowing, which will minimize surface run off delivered to <br />the access road ditches and ultimately to the bottom-most sediment catchment structure. <br />ii) It is noted that the small tributaries located below the existing rock dump will need <br />to be filled with hazd, durable, non-slaking coazse grained waste rock to promote under <br />drainage of the constructed rockpiles. <br />4. Highwall Design <br />a. Colorado Mazble, Inc., commits to creation of a sepazate section in each annual <br />reclamation report that describes geotechnical observations and tests conducted over the <br />previous yeaz and reports on the design and construction of highwalls and benches based <br />on the geotechnical investigations. <br />b. The cross section of highwall configuration is re-submitted showing completed <br />highwall configuration at eastern side of the mine pit. <br />c. For purposes statements referring to eventual backfilling of the pit, waste rock <br />placement will be made to conform with final standazd sitewide, 3:1 slope configuration. <br />Backfilling of the main pit azea will also conform to minimum requirements of storage <br />capacity for potential storm water management control. <br />5. The backfilling of the off-site road cut was performed during the third and fourth <br />week of September, and was carried out per DMG instructions of not using fine <br />grained waste rock, proper compaction of rocky waste rock from neazby, and <br />utilization of top-soil materials for surface grading. The app..2 acre former road <br />cut was backfilled with coarse waste rock, compacted with a D-9 bulldozer at one <br />foot lifts, and capped with a minimum of one foot of topsoil material gleaned <br />from within a few feet away, made accessible from channel construction for <br />Taylor Gulch rip-rapping. <br />I hope that the information contained herein will be helpful to the Division in there <br />review of adequacy. <br />Very~T.ru~ly., Yopurs, <br />`~ ~ <br />Kenneth S. Klco, Consulting Geologist <br /> <br />
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