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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
in %

Showing

Falaises A1

Medium Falaises

Coul-
euvre

Coul-
euvre

Coul-
euvre

Coul-
euvre

Coin

Coin

Grab sample

AN-1

RA-25

COU-4

COU-9

RA-21

RA-22

RA-31A

RA-31B

Nature

Frost-
heaved

Outcrop

Boulder

Boulder

Boulder

Boulder

Frost-
heaved

Frost-
heaved

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.
**MREO: Medium rare earths in oxides = Sm2O3 to Gd2O3.
***HREO: Heavy rare earths in oxides = Tb2O3 to Lu2O3.
****TREO: Total Rare Earth Oxides = LREO + MREO + HREO + Y2O3.

Sub-divisions used by Roskill Information Services Ltd. and Industrial Minerals Company of Australia Pty Ltd.