WGB-1 Gabbro Rock PGE Material

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Certificate of Analysis

First Issued: 1994
Version: August 1997

SOURCE

WGB-1 was obtained from the Wellgreen Complex, Yukon Territory, Canada. WGB-1 was prepared and certified in cooperation with the Analytical Method Development Section of the Mineral Deposits Division of the Geological Survey of Canada (GSC).

DESCRIPTION

The mineralogy of this gabbro rock consists of plagioclase feldspar, pyroxene, chlorite, prehnite and calcite. Sulphide mineralization in the sample is sparse and includes chalcopyrite, pyrrhotite, pentlandite and galena (intimately associated with the pyrrhotite). Other minerals identified include titanite, ilmenite and rutile.

INTENDED USE

WGB-1 is intended for analysis of platinum-group elements in exploration samples and for other samples where very low concentrations of gold and PGEs are required. WGB-1 is also intended for general rock analysis for a gabbro-type rock.

INSTRUCTIONS FOR USE

WGB-1 should be used "as is" without drying.

METHOD OF PREPARATION

The rock was hand-picked by a GSC geologist. The raw material was dried, comminuted and sieved to obtain a -74micron (-200 mesh) product which was blended and bottled.

HOMOGENEITY

The homogeneity of the stock with respect to its gold, platinum and palladium contents was confirmed using bottles chosen according to a stratified random sampling scheme. The analytical method was a fire-assay preconcentration followed by an inductively-coupled plasma – mass spectrometric (ICP-MS) finish performed at GSC. The homogeneity was also confirmed, at a commercial laboratory, for all major constituents by X-ray fluorescence.

CERTIFIED VALUES

WGB-1 was certified by an interlaboratory analysis program. Thirty-three university, commercial, and government laboratories from Canada, United States, Europe, Australia, Africa, and Japan participated in an interlaboratory certification program. Up to 80 elements were analyzed by methods of each laboratory's choice. A statistical analysis of the data yielded certified values for gold, palladium, platinum, Fe2O3, K2O, MgO, and chromium. Provisional values were assigned for rhodium, iridium and thirty-two others. Informational values for ruthenium and other elements are also given.

LEGAL NOTICE

The Canadian Certified Reference Materials Project has prepared this reference material and statistically evaluated the analytical data of the interlaboratory certification program to the best of its ability. The purchaser, by receipt hereof, releases and indemnifies the Canadian Certified Reference Materials Project from and against all liability and costs arising out of the use of this material and information.

REFERENCE

Further information is available upon request to:

CCRMP, CANMET-MMSL (NRCan)

555 Booth Street, Ottawa
Ontario, Canada
K1A 0G1

Telephone: (613) 995-4738
Facsimile: (613) 943-0573
E-mail: ccrmp@nrcan.gc.ca

Certified Constituents

Certified Constituents	Au, ng/g	Pd, ng/g	Pt, ng/g
Mean	2.9	13.9	6.1
95% Conf. Limits	± 1.1	± 2.1	± 1.6
Certified Constituents	Fe2O3 %	K2O %	MgO %	Cr, µg/g
Mean	6.71	0.94	9.40	291
95% Conf. Limits	± 0.14	± 0.04	± 0.19	± 13
Provisional Constituents	Ir, ng/g	Rh, ng/g	Ru, ng/g
Mean	0.33	0.32	0.3*

* Informational value

 

Additional provisional values and 95% confidence limits.

Provisional Constituents	Mean	95% Conf, Limits	Provisional Constituents	Mean	95% Conf, Limits
Al2O3 %	11.15	± 0.27	Nb, µg/g	8	± 4
CaO, %	15.78	± 0.85	Nd, µg/g	9.9	± 0.9
MnO, %	0.143	± 0.014	Ni, µg/g	76	± 7
Na2O, %	2.15	± 0.08	Rb, µg/g	19.5	± 1.5
P2O5, %	0.099	± 0.034	Sb, µg/g	2.0	± 0.4
SiO2, %	49.1	± 0.8	Sc, µg/g	44	± 4
TiO2, %	0.84	± 0.07	Sm, µg/g	2.8	± 0.3
Ba, µg/g	851	± 61	Sr, µg/g	118	± 9
Co, µg/g	29.8	± 1.7	Tb, µg/g	0.5	± 0.1
Cs, µg/g	0.52	± 0.15	Th, µg/g	1.0	± 0.1
Cu, µg/g	106	± 9	U, µg/g	0.75	± 0.1
Eu, µg/g	1.27	± 0.06	V, µg/g	222	± 17
Hf, µg/g	1.5	± 0.2	Y, µg/g	14.6	± 2.7
Ho, µg/g	0.52	± 0.07	Yb, µg/g	1.42	± 0.18
La, µg/g	8.7	± 1.1	Zn, µg/g	31.5	± 8.5
Mo, µg/g	1.2	± 0.5	Zr, µg/g	44	± 16

 

Informational ranges
(intended to be used as a guide only)

Informational Ranges		Informational Ranges
H2O %	0.16 - 0.21	Gd, µg/g	2.5 - 3.5
LOI %	3.6 - 4.0	Ge, µg/g	0.2 - 7
S total %	0.01 - 0.03	Hg, µg/g	0.01
Ag, µg/g	0.1 - 1	Li, µg/g	43 - 51
As, µg/g	1.5 - 5	Lu, µg/g	0.20 - 0.36
B, µg/g	250 - 280	Pb, µg/g	4 - 14
Be, µg/g	0.2 - 0.8	Pr, µg/g	2.3 - 2.6
Bi, µg/g	0.1 - 2	Se, µg/g	0.1 - 0.8
Cd, µg/g	0.1 - 0.4	Sn, µg/g	4.2 - 5.2
Ce, µg/g	14 - 20	Ta, µg/g	0.3 - 1
Dy, µg/g	2.5 - 3.5	Th, µg/g	1.0 - 1.6
Er, µg/g	1.2. - 1.8	Tm, µg/g	0.15 - 0.30
Ga, µg/g	11 - 13	W, µg/g	1 - 3.5