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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• MainCressonSlo eEvaluation AdrianBrown
Table 77. Hoek and Bray Rockmass Quality Table
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TABLE IV - APPROXIMATE RELATIONSHIP BETWEEN ROCK MASS QUALITY AND EMPIRICAL CONSTANTS
J 01 ~ N
J
$Q .C N
N ~
~
Q O1
H ' 4~
QW
C 2 ~ Y
WQ V O1
Z F O +~
EYRpZPtCQL f 4tLure Cr1 ter20n W
x -~ C O O F > ro Z J d Y Z~ ~'
F V Ol
C
3 J O W y is
u ~
Q N O cC i.~
3z V J ~ +t
FQ N•.•+ } W
Jot A ~~

Q1 = a3 ; ~Ca3 + SQC
Y to
J
~ Q ~
O' } r i d N
O Q Z
G. d J A •e~

= A
~B
~c/ - OI
o c •~
su N is
c •a ~
Q ate- V J d
a f- J ~
i> a C
o •~
z~
=W Y of ~vi
t
c
T
.C Q Vl ~
~ F W d W O/ ~~.1 Ol O V O W ~ ,
Q W d C1 C9 V N Ol i~1

where T=} (m - ~)
2 O ~ d
N ~f
4. O ^• d
VI u q A
u C7 Y Q iO.t
Q Z J} 0
V' V '.a N
N ap O tl
W V~
v~ ~= A~ Q
m W W
3.o
d' 7 O N ~y
Q W Q V xx ~ e
F U • b' Z} y
~ O S: N zoacQ
W K O W ~
K h O J W Y d
Z V V ' b• (f
~- O sJa z•a
Q J O C

V O> ~~
J C ~ cy V
Q~ n 1 U w ~` .U
t i J z U K S
INTACT ROLK SAMPLES m = 7.0 m = 10.0 m = 15.0 m = 17.0 m = 25.0
laboratory size specimens s 1.0 s = 1.0 s = 1.0 s = 1.0 s 1.0
free from joints
A = 0.816 A 0.918 A = 1.044 A = 1.086 A = 1.220
CSIR rating 100 g 0,658 B = 0.677 B = 0.692 B = 0.696 B = 0.705
NGI rating 500 T = -0.140 T -0.099 i = -0.067 T = -0.059 T = -0.040
VERY GOOD QUALITY ROCK MASS m = 3.5 m = 5.0 m = 7.5 m = 8.5 m 12.5
Tightly interlocking undis- s = 0.1 s = 0.1 s = 0.1 s 0.1 s = 0.1
turbed rock with un;,reather-
ed joints at ±3m. A = 0.651 A = 0.739 A = 0.848 A = 0.883. A = 0.998
CSIR rating 85 B = 0.679 B = 0.692 g = 0.702 B = 0.705 B = 0.712
NGI rating 100 T = -0.028 T = -0.020 T = -0.013 T = -0.012 T = -0.008
0000 QUALITY ROCK MASS m = 0.7 m = 1.0 m = 1.5 m = 1.7 m 2,5
Fresh to altghtly weathered s = 0.004 s = 0.004 s = 0.004 s = 0.004 s = 0
004
rock, sZaghtZy disturbed A = 0,369 427
A = 0 .
with joints at 1 to 3m. . A = 0.501 A = 0.525 A = 0.603
CSIR rating 65 B = 0.669 8 = 0.683 B = 0.695 B = 0.698 8 = 0.707
NGI rating 10 T = -0.006 T = -0.004 T = -0.003 T -0.002
T -0.002
FAIR QUALITY ROCK MASS m = 0.14 m = 0.20 m = 0.30 m = 0.34 m = 0.50
Several sets of moderately s 0.0001 s 0.0001 s 0.0001 s = O.000t s = 0.0001
weathered joints spaced at A = 0.198 A = 0.234 A = 0.280 A = 0.295 A = 0
346
0.3 to Im. .
CSIR rating 44 B = 0.662 B = 0.675 B = 0.688 B = 0.691 B = 0.700
NGI rating 1.0 T = -0.0007 T -0.0005 T = -0.0003 T = -0.0003 T = -0.0002
POOR QUALITY ROCK MA55 m = 0.04 m = 0.05 m 0.08 m = 0.09 m = 0.13
Naanerous weathered joints s 0.00001 s 0.00001 s = 0.00001 s = 0.00001 s = 0.00001
at 30 to SOOnm with some

gouge - clean waste rock. A = 0 115 A = 0.129 A = 0.162 A = 0.172 A = 0.203
CSIR rating 23 B 0.646 B = 0.655 B = 0.672 B = 0.676 B = 0.686
NGI rating 0.1 T -0.0002 T -0.0002 T = -0.0001 T = -0.0001 T = -0.0001
VERY POOR QUALITY ROCK MA55 m 0.007 m 0.010 m = 0.015 m = 0.017 m = 0.025
Nwneroua heavily weathered s= 0 s= 0 s 0 s= p s= 0
joints spaced < 50rmr with
gouge - waste with fines. A = 0.042 A 0.05b A = 0.061 A = 0.065 A = 0.078
CSIR rating 3
e = 0.534
B = 0.539
8 = 0.546
B = 0.548
B = 0.556
kGl rating 0.01 T=0 T=0 T=0 T=0 T=0
13850.980612 42