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.
Lunch time called.
GLTAH
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