Couleuvre - Geology
Despite its small size, this showing has consistently returned high-grade rare-earth values and the four 2010 boulders are no exception to the rule with an average of 15.8% TREO,11% HREO + Y2O3 over TREO and 0.04% ZrO2.|
Table 1. Grab samples from the Falaises A1, Medium Falaises, Couleuvre and Coin showings |
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|
Showing |
Falaises A1 |
Medium Falaises |
Coul- |
Coul- |
Coul- |
Coul- |
Coin |
Coin |
|
|
Grab sample |
AN-1 |
RA-25 |
COU-4 |
COU-9 |
RA-21 |
RA-22 |
RA-31A |
RA-31B |
|
|
Nature |
Frost- |
Outcrop |
Boulder |
Boulder |
Boulder |
Boulder |
Frost- |
Frost- |
|
|
La2O3 |
Lanthanum |
0.198 |
0.400 |
0.574 |
2.281 |
3.813 |
1.233 |
0.215 |
0.238 |
|
Ce2O3 |
Cerium |
0.341 |
1.172 |
1.094 |
6.044 |
6.142 |
2.653 |
0.571 |
0.652 |
|
Pr2O3 |
Praseodymium |
0.034 |
0.137 |
0.101 |
5.852 |
5.852 |
0.279 |
0.068 |
0.077 |
|
Nd2O3 |
Neodymium |
0.102 |
0.413 |
0.315 |
2.706 |
3.359 |
0.832 |
0.232 |
0.276 |
|
LREO* |
Light rare earths |
0.675 |
2.121 |
2.084 |
16.883 |
19.166 |
4.997 |
1.086 |
1.244 |
|
Sm2O3 |
Samarium |
0.018 |
0.057 |
0.051 |
0.511 |
5.798 |
0.158 |
0.041 |
0.053 |
|
Eu2O3 |
Europium |
0.002 |
0.005 |
0.006 |
0.048 |
0.061 |
0.015 |
0.004 |
0.004 |
|
Gd2O3 |
Gadolinium |
0.019 |
0.046 |
0.053 |
0.491 |
5.763 |
0.149 |
0.036 |
0.040 |
|
MREO* |
Medium rare earths |
0.039 |
0.108 |
0.111 |
1.050 |
11.623 |
0.322 |
0.081 |
0.098 |
|
Tb2O3 |
Terbium |
0.003 |
0.004 |
0.007 |
0.063 |
0.083 |
0.018 |
0.004 |
0.005 |
|
Dy2O3 |
Dysprosium |
0.015 |
0.017 |
0.033 |
0.399 |
0.547 |
0.095 |
0.019 |
0.023 |
|
Ho2O3 |
Holmium |
0.003 |
0.003 |
0.006 |
0.070 |
0.100 |
0.020 |
0.004 |
0.005 |
|
Er2O3 |
Erbium |
0.009 |
0.007 |
0.015 |
0.212 |
0.321 |
0.054 |
0.013 |
0.016 |
|
Tm2O3 |
Thulium |
0.001 |
0.001 |
0.002 |
0.025 |
0.040 |
0.008 |
0.002 |
0.003 |
|
Yb2O3 |
Ytterbium |
0.007 |
0.004 |
0.007 |
0.109 |
0.200 |
0.038 |
0.015 |
0.021 |
|
Lu2O3 |
Lutetium |
0.001 |
0.000 |
0.001 |
0.013 |
0.022 |
0.005 |
0.003 |
0.004 |
|
HREO* |
Heavy rare earths |
0.040 |
0.036 |
0.071 |
0.889 |
1.314 |
0.237 |
0.060 |
0.078 |
|
Y2O3 |
Yttrium |
0.111 |
0.082 |
0.168 |
1.626 |
2.451 |
0.464 |
0.117 |
0.157 |
|
HREO + Y2O3 |
|
0.151 |
0.118 |
0.238 |
2.515 |
3.765 |
0.701 |
0.177 |
0.236 |
|
HREO + Y2O3 / TREO |
% |
17 |
5 |
10 |
12 |
11 |
12 |
13 |
15 |
|
TREO* |
Total rare earths |
0.865 |
2.348 |
2.433 |
20.448 |
34.553 |
6.019 |
1.344 |
1.578 |
|
ZrO2 |
Zirconium |
0.119 |
0.320 |
0.023 |
0.041 |
0.045 |
0.066 |
4.975 |
9.696 |
|
* LREO: Light rare earths in oxides = La2O3 to Nd2O3. |
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Sub-divisions used by Roskill Information Services Ltd. and Industrial Minerals Company of Australia Pty Ltd. |
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