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DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1
1:50,000 Figure No:
12.06.08
Ditton Geotechnical Services Pty Ltd
Predicted Mine Subsidence Contours above Longwall Layout for Case 2 (Spanning Garrawilla Volcanics and Maximum Chain Pillar Subsidence) and 4.2 m Extraction Height
36
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
TTT
TT
TT
TTT
TT
TTTT
T
TT
T
TTTTTTTT
TT
TT
Tank
T
TTT
T
TT
TT
TT
TT
TTTT
TT
T
T
T
TTT
TTTT
TTTT
XL1
XL2
XL3
XL4
XL5
XL6
XL7
XL8
XL9
XL10
Subsidence (m)
-2.6
-2.4
-2
-1.5
-1
-0.5
-0.1
-0.002
Key:
SubsidenceContours
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/TracksOrchards
Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
LW1LW2LW3LW4LW5LW6LW7LW8LW9LW10LW11LW12LW13
LW26LW25LW24LW23LW22LW21LW20LW19LW18LW17LW16LW15LW14
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1
1:60,000 Figure No:
12.06.08
Ditton Geotechnical Services Pty Ltd
Predicted Mine Subsidence Contours above Longwall Layout for Case 3 (Non-spanning Garrawilla Volcanics and Mean Chain Pillar Subsidence)
37
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
XL1
XL2
XL3
XL4
XL5
XL6
XL7
XL8
XL9
XL10
T
T
T
TT
T
T
T
TT
T
T
T
TT
T
T
T
T
T
TTTT T
TT
T
TT
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
TT
T
T
T
T
T
T
T
TT
TT
TT
T
T TT
Subsidence (m)
Northern LWs
Southern Longwalls
-2.6
-2.4
-1.5
-1
-0.5
-0.1
-0.0025
Key:
SubsidenceContours
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/TracksOrchards
Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
LW1LW2LW3LW4LW5LW6LW7LW8LW9LW10LW11LW12LW13
LW26LW25LW24LW23LW22LW21LW20LW19LW18LW17LW16LW15LW14
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1
1:60,000 Figure No:
12.06.08
Ditton Geotechnical Services Pty Ltd
Predicted Principle Tilt Contours above Longwall Layout for Case 3 (No Spanning Garrawilla Volcanics and Minimum Chain Pillar Subsidence) and 4.2m Mining Height
38
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
XL1
XL2
XL3
XL4
XL5
XL6
XL7
XL8
XL9
XL10
T
T
T
TT
T
T
T
TT
T
T
T
TT
T
T
T
T
T
TTTT T
TT
T
TT
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
TT
T
T
T
T
T
T
T
TT
TT
TT
T
T TT
Tilts (mm/m)
Northern LWs
Southern Longwalls
2
5
10
15
20
25
30
35
Key:
tiltcontours
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/TracksOrchards
Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1
1:60,000 Figure No:
12.06.08
Ditton Geotechnical Services Pty Ltd
Predicted Principle Strain Contours above Longwallsfor Case 3 (non-spanning Garrawilla Volcanics and minimum chain pillar subsidence) and 4.2 m Mining Height
39
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
XL1
XL2
XL3
XL4
XL5
XL6
XL7
XL8
XL9
XL10
T
T
T
TT
T
T
T
TT
T
T
T
TT
T
T
T
T
T
TTTT T
TT
T
TT
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
TT
T
T
T
T
T
T
T
TT
TT
TT
T
T TT
Strain (mm/m)
Northern LWs
Southern Longwalls
Key:
Straincontours
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/TracksOrchards
-10
-8
-6
-4
-2
0
2
4
6
8
10
Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1Narrabri Coal Operations - Narrabri Coal Mine (Stage 2)
1:60,000 Figure No:
25.03.08
Ditton Geotechnical Services Pty Ltd
Pre-mining and Predicted Post-Mining Surface Level Contours above Longwall Layout for Case 3 (non-spanning Garrawilla Volcanics and minimum chain pillar subsidence) & 4.2 m Mining Height
40
Key:
Pre-mining contours
Post-mining contours
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/Tracks
Orchards
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
T
T
T
T
T
T
T
T
TT
T
T
T
TT
T
T
T
T
T
T
T
T
T T
T
T
T
T
T
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T T
TT
T T
T
T TT
Kurrajo
ng Cre
ek
(Trib
utary
1)
Kurrajo
ng Cre
ek
Pine C
reek
(Trib
utary
1)
Pine Creek
Pine C
reek
(Trib
utary
2)
LW1LW2LW3LW4LW5LW6LW7LW8LW9LW10LW11LW12LW13
LW26LW25LW24LW23LW22LW21LW20LW19LW18LW17LW16LW15LW14
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1Narrabri Coal Operations - Narrabri Coal Mine (Stage 2)
1:60,000 Figure No:
25.03.08
Ditton Geotechnical Services Pty Ltd
Post-mining Surface Crack Width Potential above Longwall Layout for Case 3 (non-spanning Garrawilla Volcanics and minimum chainpillar subsidence) and 4.2 m Mining Height
41
Key:
Cover DepthContours
Faults
Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/Tracks
Orchards
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
275
300
250
225
200
175 150
325
350
375
250
275
225
325
350
175
200
150
125
200
300
375
T
T
T
T
T
T
T
T
T
T
T
T
T
TT
T
T
T
T
T
T
T
T
T T
T
T
T
T
T
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T T
T
T
T T
T
T T
T
B u i ld i ng # 2. 1
B u i ld i ng # 2. 2
B ui l di n g # 3 . 2
B u i ld i ng # 3. 1B ui l di n g # 3 . 3
B ui l di n g # 4 . 1
B u il d i ng # 4. 2B u i ld i ng # 4. 3
B u i ld i n g # 5 .1
B ui l d in g #5 . 2
B u il d in g #5 . 3
B u i ld i n g # 5 .4
T an k # 2
B u il d in g #6 . 1
B u i l di n g # 6 .2
B u il d in g #7 . 1
B u il d in g #7 . 2
B u il d in g #7 . 3
B u il d in g #8 . 1
B u il d in g #8 . 2B u i l di n g # 8 .3
B u il d in g #1 . 1
B ui l di n g # 1 . 2
T an k # 1
B u i ld i ng # 9. 1
B u il d in g #9 . 2
B u il d in g #9 . 3B u i l di n g # 9 .4
B u i ld i n g # 9. 5
B ui l di n g # 9 . 6
Orc h ard 1
O rch a rd 2
D am 1
Kurrajo
ng Cre
ek
(Trib
utary
1)
Kurrajo
ng Cre
ek
Pine C
reek
(Trib
utary
1)
Pine Creek
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
40
60
80
100
120
140
160
180
200
PotentialCrack Width
(mm)
CompressiveShear/
Shoving
TensileCracking
Pine C
reek
(Trib
utary
2)
LW1LW2LW3LW4LW5LW6LW7LW8LW9LW10LW11LW12LW13
LW26LW25LW24LW23LW22LW21LW20LW19LW18LW17LW16LW15LW14
Engineer: S.Ditton Client: Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
Drawn: S.Ditton NAR-001/1
Date: 18.11.08 Title: Schematic Model of Overburden Fracture Zones by Various Researchers
Ditton Geotechnical
Services Pty Ltd Scale: NTS Figure No: 42
DgS
'A' Horizon
'B' Horizon
Surface Cracking
(Tensile Strain Zone)
Surface Cracking
(Tensile Strain Zone)Surface Cracking
(Compressive Strain Zone)
Key
'A' Horizon - Zone of Continuous Crack Connection to Workings (Whittaker and Reddish,1989)
'B" Horizon - Zone Of Discontinuous Crack Connection to Workings (Whittaker and Reddish, 1989)
Surface water flow path Sub-surface water flow path
Engineer: S.Ditton Client: Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
Drawn: S.Ditton NAR-001/1
Date: 08.08.08 Title: Schematic Model of Overburden Fracture Zones in Forster, 1995 Model
Ditton Geotechnical
Services Pty Ltd Scale: NTS Figure No: 43
DgS
Engineer: S.Ditton Client: Narrabri Coal Operations Pty Ltd - Narrabri Coal Mine (Stage 2)
Drawn: S.Ditton NAR-001/1
Date: 12.08.08 Title: Continuous and Discontinuous Sub-Surface Fracture Heights above NCM Longwall Layout
Ditton Geotechnical for a 4.2 m Mining Height (based on ACARP, 2003 and Forster,1995)
Services Pty Ltd Scale: NTS Figure No: 44
DgS
mean A/H = 0.2295Ln(x) + 1.1321
U95% B/H = 0.1694Ln(x) + 1.5559
Mean B/H = 0.1694Ln(x) + 1.3809
U95% A/H = 0.2295Ln(x) + 1.4006
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
Overburden Curvature or 'Bending Energy' Index, Smax/W2 (km
-1)
Heig
ht A
bove W
ork
ings/C
over
Depth
Ratio (
h/H
)
Measured A/H
Measured B/H
Predicted Mean A/H
Predicted U95% A/H
Predicted Mean B/H
Predicted U95% B/H
21T (Forster,1995 LowerBound)
33T (Forster,1995 UpperBound)
W
H
A - Continuous Fracturing
Limit (total drilling fluid loss)
B - Discontinuous Fracturing Limit
(partial drilling fluid loss)
Smax
h
Goaf
Engineer: S.Ditton Client: Narrabri Coal Operations Pty Ltd
Drawn: S.Ditton NAR-001/1
Date: 12.08.08 Title: Sub-surface Fracture Height above the Proposed Layout and 4.2 m Mining Height,
Ditton Geotechnical based on ACARP, 2003 and Forster, 1995
Services Pty Ltd Scale: NTS Figure No: 45
0
50
100
150
200
250
300
350
400
450
100 150 200 250 300 350 400 450
Cover Depth (m)
He
igh
t o
f C
on
tin
uo
us F
ractu
rin
g: A
Ho
rizo
n (
m)
mean U95%CL 21T (Forster, 1995) 33T (Forster, 1995) Surface 15m Below Surface
Super-critical LWs (W/H>1.4) Sub-critical LWs (W/H<1.4)
DgS
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1Narrabri Coal Operations - Narrabri Coal Mine (Stage 2)
1:60,000 Figure No:
25.03.08
Ditton Geotechnical Services Pty Ltd
Post-mining Surface Slopes and Surface Features Above LongwallsLW 1-26 for Case 3 (Maximum Panel and Minimum Chain Pillar Subsidence) and 4.2m Mining Height
46
772000 773000 774000 775000 776000 777000
6616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
T
T
T
TT
T
T
T
TT
T
T
T
TT
T
T
TT
T
TTTT T
TTT
TT
T
T
Tank
T
T
T
T
T
T
T
T
T
T
T
T
T
T
TT
T
T
T
T
T
T
T
TT
TT
TT
T
TTT
Building #2.1
Building #2.2
Building #3.2Building #3.1Building #3.3
Building #4.1Building #4.2Building #4.3
Building #5.1
Building #5.2
Building #5.3
Building #5.4
Tank #2
Building #6.1
Building #6.2
Building #7.1
Building #7.2
Building #7.3
Building #8.1
Building #8.2Building #8.3
Building #1.1
Building #1.2
Tank #1
Building #9.1
Building #9.2
Building #9.3Building #9.4
Building #9.5Building #9.6
Orchard 1
Orchard 2
Dam 1
Kurrajo
ng Cre
ek
(Trib
utary
1)
Kurrajo
ng Cre
ek
Pine C
reek
(Trib
utary
1)
Pine Creek
0
2
4
6
8
10
12
14
16
18
20
Degrees
Pine C
reek
(Trib
utary
3)
LW1LW2LW3LW4LW5LW6LW7LW8LW9LW10LW11LW12LW13
LW26LW25LW24LW23LW22LW21LW20LW19LW18LW17LW16LW15LW14
Key:
Post-mining Surface Levels
Design Angle of Draw
Main Creeks
Farm Dams
Fences
Buildings/Tanks
Unsealed Roads/Tracks
Orchards
T
DgS
Engineer: S.Ditton Client:
Title:
Scale:
S.Ditton
Date:
Drawn: NAR-001/1Narrabri Coal Operations - Narrabri Coal Mine (Stage 2)
1:60,000 Figure No:
25.03.08
Ditton Geotechnical Services Pty Ltd
Post-mining Surface Levels and Gradient Changes above LongwallsLW1-26 for Case 3 (Non-Spanning Garrawilla Volcanics and Minimum Chain Pillar Subsidence) and 4.2m Mining Height
47
Key:
Post-mining Levels Main Creeks
Farm Dams
Fences
Buildings
Unsealed Roads/Tracks
Orchards
772000 773000 774000 775000 776000 7770006616000
6617000
6618000
6619000
6620000
6621000
6622000
6623000
6624000
6625000
Kurrajong C
reek
(Trib
utary
1)
Kurrajong C
reek
Pine C
reek
(Trib
utary 1)
Pine Creek
-1.8
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
GradientChange
(degrees)
Pine C
reek
(Trib
utary
3)
