MA-2c Certificate of Analysis

 

Printable version of the certificate (PDF, 199.26 kb)

First issued: July 2000
Last revision: December 2007

Table 1 - Certified value for gold and provisional value for silver

Element	Ag (µg/g)	Au (µg/g)
Mean	0.51	3.02
Within-laboratory standard deviation	0.07	0.14
Between-laboratories standard deviation	0.13	0.13
95% confidence interval	0.10	0.06
Status	provisional	certified

Informational values are in Table 2.

Source

The raw material for MA-2c was donated by Kinross Gold from its operation in Kirkland Lake, Ontario.

Description

MA-2c is the fourth generation in a series with predecessors, MA-2, MA-2a and MA-2b, which are no longer available. The deposits of the area are known to contain electrum in a relatively simple siliceous ore.

Intended use

MA-2c is suitable for analysis of gold, silver, majors, minors, and trace elements in gold ores. Examples of intended use are: for quality control in the analysis of samples of a similar type, method development, arbitration and the calibration of equipment.

Instructions for use

The assigned values pertain to the date when issued. CCRMP is not responsible for changes occurring after receipt by the user. MA-2c should be used "as is". The contents of the bottle should be thoroughly mixed before taking samples.

Method of preparation

The raw material was dried, crushed, ground and sieved to produce a product with a mesh size of less than 75 µm. After blending, the material was bottled in 400-g units. This is the only size available.

State of homogeneity

A homogeneity assessment for gold was performed by an independent laboratory on 30-g samples using instrumental neutron activation analysis. Thirty gram samples were analysed for silver using fire assay with lead collection and determination by atomic absorption spectroscopy. No evidence of inhomogeneity was found for gold or silver. A one-way analysis of variance technique (ANOVA) was used to assess the homogeneity of gold and silver1. The ratio of the between-bottle to within-bottle mean squares was compared to the F statistic at the 95% level of probability. No evidence of inhomogeneity was observed. Use of a smaller sub-sample will invalidate the use of the certified value and associated parameters. Further details are available in the certification report.

Method of certification

Twenty industrial, commercial, and government laboratories participated in the 1998 interlaboratory certification program. Gold and silver were analysed by a variety methods. A statistical analysis of the data yielded Certified Values for gold, and a provisional value for silver. Informational values are derived from the mean of five results from up to six laboratories using one or more of instrumental neutron activation; acid digestion followed by atomic absorption spectroscopy, inductively coupled plasma - atomic emission spectroscopy, or inductively coupled plasma - mass spectrometry; fusion with lithium metaborate followed by x-ray fluorescence; and combustion methods. ANOVA was used to estimate the consensus value and other statistical parameters1. Full details of all phases of the work, including statistical analysis, the methods and the names of the participants are contained in CCRMP Report 2000-2E.

Legal notice

CCRMP 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 CanmetMINING from and against all liability and costs arising out of the use of this material and information.

Certification history

MA-2c was originally released in July 2000. This version of the certificate, the second, was issued due to the expiration of the first version, and contains no changes in the values.

Period of validity

These certified values are valid until December 31, 2030. Updates will be made via the CCRMP web site.

Certifying officers

Joseph Salley, Data Processor
Maureen E. Leaver, CCRMP Coordinator

For further information

The preparation and certification procedures used for MA-2c, including methods and values obtained by individual laboratories, are given in CCRMP Report 00-2E. This report is available free of charge upon request to:

CCRMP, CanmetMINING
555 Booth Street
Ottawa, ON K1A 0G1
Canada

Telephone: 343-543-6830
Contact CCRMP

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Reference

1. Brownlee, K.A., Statistical Theory and Methodology in Science and Engineering; John-Wiley and Sons, Inc.; New York; 1960

Table 2 - Informational values for the mean of up to six sets using a variety of methods.

Analyte	Unit	Mean	SD
Al	%	6.70	0.29
As	µg/g	9.10	2.32
Ba	%	0.22	0.01
Be	µg/g	3.74	0.48
Bi	µg/g	0.66	0.05
C	%	1.78	0.07
Ca	%	4.76	0.05
Cd	µg/g	0.7	0.1
Ce	µg/g	141	2
Co	µg/g	25	2
Cr	µg/g	216	45
Cs	µg/g	9.09	0.73
Cu	µg/g	95	5
Dy	µg/g	5.16	0.05
Er	µg/g	2.26	0.02
Eu	µg/g	3.15	0.15
Fe	%	5.39	0.51
Ga	µg/g	17.62	0.48
Gd	µg/g	9.58	0.19
Hf	µg/g	5.40	0.14
Ho	µg/g	0.92	0.03
K	%	3.20	0.06
La	µg/g	61.49	8.48
Li	µg/g	27.71	1.94
Lu	µg/g	0.30	0.01
Mg	%	2.91	0.32
Mn	%	0.10	0.01
Mo	µg/g	14.3	1.4
Na	%	2.23	0.08
Nb	µg/g	6.52	0.13
Nd	µg/g	61.9	1.2
Ni	µg/g	64	8
P	%	0.24	0.02
Pb	µg/g	25	4
Pr	µg/g	16.26	0.20
Rb	µg/g	147	5
S	%	0.23	0.03
Sb	µg/g	3.31	0.20
Sc	µg/g	17.47	1.13
Si	%	24.40	0.20
Sm	µg/g	12.0	0.4
Sr	µg/g	1471	16
Ta	µg/g	0.56	0.17
Tb	µg/g	1.10	0.13
Th	µg/g	9.2	2.6
Ti	%	0.40	0.02
Tl	µg/g	0.92	0.04
Tm	µg/g	0.30	0.02
U	µg/g	2.69	0.11
V	µg/g	155	29
W	µg/g	6.02	0.63
Y	µg/g	24.5	1.4
Yb	µg/g	2.00	0.09
Zn	µg/g	93	9
Zr	µg/g	211	38
LOI	%	7.55	0.04