My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
1993-04-27_REVISION - M1977378 (2)
DRMS
>
Day Forward
>
Revision
>
Minerals
>
M1977378
>
1993-04-27_REVISION - M1977378 (2)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/27/2021 8:06:48 AM
Creation date
6/15/2012 6:41:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
REVISION
Doc Date
4/27/1993
Doc Name
Response
From
John F. Abel, Jr.
To
Sunnyside Gold Corp
Type & Sequence
TR14
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
17
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
999 <br /> JOHN F.ABEL.JR. v p <br /> MINING ENGINEER -1 7 7_ 70 <br /> 310 LOOKOUT VIEW COURT <br /> GOLDEN.CO 80401 <br /> 303-279-4901 <br /> // FAX 278$163 <br /> yApril 27, 1993 <br /> Larry R. Perino <br /> /6unnyside Gold Corp. <br /> P. O. Box 177 <br /> Silverton, CO 81433 <br /> Dear Larry: <br /> This letter report was prepared in response to the list of <br /> rock mechanics concerns raised by the Apri , 993 letter from <br /> Allen R. Sorenson, Reclamation Specialist, of the Division off <br /> Minerals and Geology with respect to Technical Revision TR-14. <br /> Specifically item 8 (pages 6 and 7) , item 9 (page 7) and item 11 <br /> (pages 7 and 8) are addressed. <br /> 8. Potential for Failure from Thrust <br /> Near the bottom of page 6 is the statement, "There is little <br /> or no information included regarding the shear strength of the rock <br /> as a mass, or the resistance to shear of the rock-concrete <br /> interface." <br /> This statement is only partially correct. Measurement and <br /> analysis of the shear strength of the rock part of the interface <br /> was not performed for several reasons. The most important reason <br /> was given near the center of page 13 of the base report, "Bulkhead <br /> design for the Sunnyside Mine" dated March 10, 1993. The <br /> unconfined compression strength of the volcanic latite present at <br /> the Sunnyside Mine is consistently much stronger than the concrete <br /> design compression strength (Abel, 1993, Appendix B, page 54) . <br /> Additionally, 1) there is no direct method for measuring the shear <br /> strength (cohesion) of intact rock and only indirect methods of <br /> calculating the shear strength of rock are possible, 2) there is no <br /> mathematical possibility that the calculated intact shear strength <br /> of the latite could be as low as the concrete design shear <br /> strength, 3) the post-failure fragments from nine of the eleven <br /> unconfined compression tests performed indicated that the failure <br /> was structurally controlled and, therefore, the blast induced and <br /> natural structural weaknesses present in the latite adjacent to the <br /> proposed bulkhead locations were included in the measured rock <br /> unconfined compression strength, and 4) the shear (bond) strength <br /> of the rock-concrete interface was ignored because the lower, more <br /> conservative concrete shear strength was utilized for bulkhead <br /> design. These reasons for not treating the shear strength of the <br /> latite are discussed in detail below. <br />
The URL can be used to link to this page
Your browser does not support the video tag.