2008-04-15_REVISION - M1980244 ‎(193)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 4/15/2008
• Doc Name: VOL IV APP 5 Attachment 1 Cresson Mine Slope Design
• From: CC & V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

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• Main CressonSlopeEvaluation AdrianBrown
3.2.2 Uniaxial compression testing
Uniaxial compression testing was performed on a total of 14 samples, two from phonolite dikes, six
from breccia, and six from phonolite porphyry. The results are presented in Table 2.
Table 2. Uniaxial Compressive Strength Test Results
•
Hole
Number Rock
Type* Depth Density Failure
Load Failure
strength UCS** Failure
type*** Angle Diameter Est.
Cohesion
feet pc lb psi psi deg in psi
CC-93-63 Tbx1L 331 142 65000 14384 14432 Crushing 60 2.492 5771
CC-93-63 Tbx1L 482 151 68000 15024 15054 Crushing 50 2.496 6843
CC-93-65 Tbx1L 380 151 52200 11538 11539 Crushing 45 2.496 5334
CC-93-64 Tbx1L 632 139 32000 7084 7093 Mixed 45 2.493 3278
CC-93-64 Tbx1L 567 137 26000 5754 5757 Planar 70 2.487 1720
CC-93-65 Tbx1L 256 140 24800 5490 5502 Mixed 60 2.487 2211
CC-93-63 Tphd 322 145 38900 8609 8627 Planar 70 2.487 2574
CC-93-64 Tphd 239 158 125000 28294 29339 Crushing 45 2.483 12907
CC-93-63 TphK 390 157 67000 14813 14817 Plnraz 65 2.485 5291
CC-93-64 TphK 608 143 41200 9086 9122 Planaz 50 2.487 4176
CC-93-63 TphK 212 144 48300 10693 10724 Plnraz 70 2.487 3196
CC-93-63 TphK 182 147 51000 11300 11323 Crushing 45 2.485 5258
CC-93-63 TphK 266 150 52400 11698 11716 Crushing 45 2.489 5385
CC-93-64 TphK 307 143 35000 7719 7646 Planar 65 2.489 2755
^` lpna - Ynonolite llilce; "1'bx1L -phonolite porphyry; TphK - Breccia
**UCS -Unconfined Compressive Strength
* * *Planaz -failure on weak plane; Crushing -intact rock failure; Mixed -combination of planar and crushing
Source of data: Call and Nicholas, 1994, Appendix A and Table A2.
C7
The intact rock strength for the rock samples can be assessed from the tests which were observed to be
"crushing" tests. The tests identified as "planar" failure or "mixed" failure had all or part (respectively)
of the failure plane take place along pre-existing rock fabric (usually healed joints), and so are not
representative of, and weaker than, the intact rock strength.
1385D.980612 5