Reply to @2ic Pretty much on the same page with different perspectives and knowledge levels.
The Luni deposit, as you are aware, has two shallow (<=100m vertical) SG (Supergene High Grade?) blankets The early seismic seems to have picked this out above the fresh basement. Local example. I haven't seen a detail reconciliation of Luni results with the drilling. Suspect it is reasonable with some of the depth difference, perhaps all, related in some way to faulting of the carbonatite. Since weathering will post date the faulting by a large period of time I do wonder what might have happened.
Seems the shallower zone may be less well developed at Green. Probably exists at Emily. Maybe no good reason to do passive seismic at targets with grid pattern aircore.
Strip ratio for the deeper zone is obviously higher and would need a grade/consistency factor sufficient to make it economic.
===================== What happens in the fresh zones of carbonatite. Not a huge amount of drilling into these in the West Arunta so far. Probably enough at Luni and scattered holes on ENR ground and Pachapadra. I sorted my assay data base to filter out holes (inclined mainly) that went deeper than 120m and had grades over 1% Nb2O5. Quite a long list.
Hole ID
From (m)
To (m)
Interval (m)
Nb_{2} O_{5} (%)
TREO (%)
1
LUDD23015
220
221
1
1.03
0.25
2
LURCD23002
179.8
181
1.2
1.5
0.14
3
LUDD23004
176
178
2
1.34
0.11
4
LUDD23015
176
177
1
1.19
0.23
5
LURC23174
176
177
1
1.04
0.21
6
LURCD23002
175.2
176.3
1.2
1.22
0.25
7
LUDD23006
172.1
174.1
2
1.37
0.18
8
LURC23175
170
171
1
1.60
2.70
9
LURCD23115
169.9
173.8
3.9
2.03
0.29
10
LUDD23001
167.74
170.55
2.81
3.09
0.13
11
LUDD23015
162
164
2
1.15
0.16
12
LUDD23017
161.6
162.9
1.3
1.33
0.25
13
LURCD23115
157.2
165.8
8.6
1.46
0.36
14
LUDD23015
157
158
1
1.35
0.13
15
LUDD23001
156.29
163.73
7.44
2.9
0.37
16
LURC23174
153
154
1
1.08
0.13
17
LURC23175
153
159
6
1.41
1.66
18
LUDD23031
151.4
155
3.6
1.16
0.29
19
LUDD23016
150.5
155.7
5.2
1.77
1.14
20
LUDD23016
149.9
156
6.2
1.67
0.99
21
LURC23236
145
146
1
1.06
0.71
22
LURC23242
144
145
1
1.07
0.19
23
LURC23057
143
149
6
1.24
0.85
24
LURC23105
143
144
1
1.26
0.23
25
LUDD23032
140
145
5
1.09
0.33
26
LUDD23024
136.0
137.0
1.0
1.03
0.17
27
LURC23063
136
137
1
1.23
0.27
28
LUDD23025
133.8
145.4
11.6
2.47
1.79
29
LURCD23042
133.6
133.9
0.3
1.07
1.51
30
LURC23068
132
135
3
1.47
0.11
31
LURCD23092
128.6
130
1.5
1.56
0.07
32
LURC23174
127
139
12
3.03
0.45
33
LURC23247
127
128
1
1.09
0.37
34
LUDD23027
126.8
134
7.2
1.28
0.15
35
LUDD23007
126.6
166.7
40.1
3.19
0.31
36
LUDD23031
126
136.3
10.3
5.17
1.06
37
LURC23118
125
126
1
1.01
0.34
38
LURC23232
125
126
1
1.46
0.2
39
LURC23005
124
144
20
2.52
0.75
40
LURC23242
124
128
4
1.54
0.3
41
LUDD23025
123.3
129.6
6.4
2.92
2.58
42
LURC23063
123
124
1
1.33
0.33
43
LURC23072
123
124
1
1.16
0.31
44
LURC23105
123
125
2
1.59
0.20
45
LURC23176
122
127
5
2.54
0.08
46
LUDD23014
121
123.4
2.4
1.55
0.17
47
LUDD23026
121
126.9
5.9
1.29
0.29
48
LURC23140
121
124
3
1.66
0.25
49
LURC23239
120
128
8
1.81
0.39
Doesn't include 2022 holes. Yellow >1.5% and/or <10m
Relatively limited high grade Nb further than 150m down hole. Probably much a factor of limited drill hole depth. There does seem to be a significant number of holes in the table around the 120-130+- depth. Transition zone or base of weathering. A quick, near random check, showed deeper intersections common in the south (174'5; 115, 16). LUDD001 near the X may give some idea of what is present below 160m.
====================== Sulphide Queen and Mt Weld (pit anyway) are both around 650 m in maximum dimension.
Different types of deposits but extremely high grade.
Mt Weld has multiple other mineralised zones.
The exploration geo optimism translates this relatively small footprint in these world class deposit into the potential that exists around the 400m line spacing at Green. Any zone would need to be 2+% Nb and 20+- thick to make a large impact. Has drilling density precluded this? Probably but not totally with more to come from the east.
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