Tel: +2711 923 7000 Fax: +2711 923 7027 e-mail: [email protected] web: www.amis.co.za
A division of the Set Point Group, 30 Electron Avenue, Isando, 1600. P.O. Box 856, Isando, 1600, South Africa.
AMIS0156
Certified Reference Material
Uraniferous Alaskite Ore,
Rössing Uranium Mine, Namibia
Certificate of Analysis
Recommended Concentrations and Limits1.
(at two Standard Deviations)
Certified Concentrations2.
U XRF
(or U3O8 XRF)
Ca M/ICP ppm
Specific Gravity
210
248
2.42
2.69
±
±
±
±
23
27
0.21
0.18
ppm
ppm
%
Provisional Concentrations
U M/ICP
(or U3O8 M/ICP)
Nb M/ICP
Ta M/ICP
195
230
17.50
2.14
±
±
±
±
34
40
2.80
0.30
ppm
ppm
ppm
ppm
1. Manufacturers recommended limits for use of the material as control samples, based on two
standard deviations, calculated using “Between Laboratory” statistics for treatment of the data
for trivial, non-trivial and technically invalid results. See sections 1, 9 and 12.
2. There is additional certified major element data presented on p2 and uncertified trace element
data presented as an appendix.
Directors: GJ Horsfield (CEO), MD Evers (CFO)(British), SJ Ingram, MC Louw,
K Gerber, N Robinson, MJ Smith, MH Snelling, J Vassiloudis, D Williams
Major Element
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Al2O3
CaO
Fe2O3
K2O
MgO
MnO
Na2O
P2O5
SiO2
TiO2
12.82
3.45
3.01
4.46
1.92
0.06
3.44
0.14
68.47
0.30
±
±
±
±
±
±
±
±
±
±
0.20
0.10
0.08
0.12
0.06
0.01
0.12
0.01
0.60
0.01
%
%
%
%
%
%
%
%
%
%
Provisional Concentrations
Cr2O3
LOI
0.064
1.77
±
±
0.010
0.46
%
%
1.
Intended Use: AMIS0156 can be used to check analysis of samples of uraniferous
alaskite ores with a similar grade and matrix.
It is a matrix matched Certified Reference Material, fit for use as control samples in routine assay
laboratory quality control when inserted within runs of samples and measured in parallel to the
unknown. Its purpose is to monitor inter-laboratory or instrument bias and within lab precision. It
can be used, indirectly, to establish the traceability of results to an SI system of units.
The recommended concentrations and limits for this material are property values based on a
measurement campaign (round robin) and reflect consensus results from the laboratories that
participated in the round robin.
Slight variations in analytical procedures between laboratories will reflect as slight biases to the
recommended concentrations (see 19). Good laboratories will report results within the two standard
deviation levels with a failure rate of <10 %.
The material can also be used for method development and for the calibration of equipment.
2.
Origin of Material: AMIS0156 was supplied by Rio Tinto Limited from the Rössing
Uranium Mine situated 70km north-east of Swakopmund in Namibia. The uranium mineralisation is
associated with Neoproterozoic Damara Orogen syntactic alaskitic granites that display
concordant, discordant and replacement relationships to the heavily folded host gniesses, marbles
and limestones of the Khan and Rössing Formations.
3.
Mineral and Chemical Composition: The uranium bearing minerals are mainly uraninite
and its alteration products, and minor betafite.
4.
Appearance: The material is a very fine Light Grey powder (Corstor colour chart – 5Y 7/1).
5.
Handling instructions: The material is packaged in Laboratory Packs and Explorer
Packs that must be shaken or otherwise agitated before use. Normal safety precautions for
handling fine particulate matter are suggested, such as the use of safety glasses, breathing
protection, gloves and a laboratory coat.
2
6.
Method of Preparation: The material was crushed, dry-milled and air-classified to <54um.
Wet sieve particle size analysis of random samples confirmed the material was 98.5% <54um. It
was then blended in a bi-conical mixer, systematically divided and then sealed into 1kg Laboratory
Packs. Explorer Packs are subdivided from the Laboratory packs as required. Samples were
randomly selected for homogeneity testing and third party analysis. Statistical analysis of both
homogeneity and consensus test results were carried out by an independent statistician.
7.
Methods of Analysis requested:
1. Multi-acid digest, including HF, ICP- OES or ICP-MS. Multi element scan to include U, Ca,
Ta, Nb.
2. U, Ca, Ta, Nb. XRF.
3. Majors ( Al2O3, CaO, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, SiO2, TiO2. LOI. ) XRF fusion.
4. SG ( gas pycnometer ).
8.
Information requested:
1.
2.
3.
4.
5.
6.
State and provide brief description of analytical techniques used.
State aliquots used for all determinations.
Results for individual analyses to be reported ( not averages )
All results for multi-element scans to be reported in ppm.
All results for major elements to be reported in %.
Report all QC data, to include replicates, blanks and certified reference materials used.
9.
Method of Certification: Twenty one laboratories were each given eight packages,
comprising eight samples scientifically selected from throughout the batch. Nineteen laboratories
reported results in time for certification of the economic elements. Eight of these laboratories
reported results for the major elements.
Final limits were calculated after first determining if all data was compatible within a spread
normally expected for similar analytical methods done by reputable laboratories. Data from any one
laboratory was them removed from further calculations when the mean of all analyses from that
laboratory failed a “t test” of the global means of the other laboratories. The means and standard
deviations were then re-calculated using all remaining data. Any analysis that fell outside of the
new two standard deviations was removed from the ensuing data base. The mean and standard
deviations were again calculated using the remaining data.
The “between-laboratory” standard deviation is used in the calculation to eliminate technically and
statistically invalid data. Upper and lower limits are based on the standard deviation of the
remaining data, which reflect individual analyses and can be used to monitor accuracy in routine
laboratory quality control. This is different to limits based on standard deviations derived from
grouped set of analyses (see 12), which provide important measures for precision and trueness,
but which are less useful for routine QC.
Standards with an RSD of near or less than 5 % are termed “Certified”, RSD’s of between near 5 %
and 15 % are termed “Provisional”, and RSD’s over 15 % are termed “Informational”.
10.
Participating Laboratories: (Not in same order as in the table of assays):
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Activation Laboratories Pty Ltd (ActLabs) CA
ALS Chemex Laboratory Group Brisbane Australia
ALS Chemex Laboratory Group Johannesburg SA
ALS Chemex Laboratory Group Lima (Peru)
ALS Chemex Laboratory Group Perth WA
ALS Chemex Laboratory Group Vancouver CA
Anglo Gold Ashanti - Vaal River Laboratory SA
Anglo Research (Crown Campus)
Genalysis Laboratory Services (South Africa) Pty
Genalysis Laboratory Services WA
Performance Labs (Welkom)
Reptile Uranium Namibia
Rossing Uranium Limited
Set Point Laboratories (Isando) SA
3
15.
16.
17.
18.
19.
SGS Australia Pty Ltd (Newburn) WA
SGS Geosol Laboratories Ltda (Brazil)
SGS Mineral Services Lakefield (Canada)
SGS South Africa (Pty) Ltd - Booysens
Ultra Trace (Pty) Ltd WA
11.
Assay Data: Data as received from the laboratories for the important certified elements
listed on p1 is set out below. A proficiency report has been sent to the managers of the
participating laboratories. Additional digital data from this round robin is available on request.
Lab
Code
A
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
C
C
C
C
C
C
C
C
D
D
D
D
D
D
D
D
E
E
E
E
E
E
E
E
F
F
F
F
F
F
F
F
G
G
G
G
G
G
G
G
H
H
H
H
H
H
H
H
I
I
I
I
I
I
I
I
J
J
J
J
J
J
J
J
K
K
K
K
K
K
K
K
U
M/ICP
ppm
209
207
207
208
205
211
202
208
170
168
172
175
169
172
169
179
194
191
192
187
187
180
189
191
192
180
183
185
183
184
185
186
179
185
180
185
179
187
189
183
185
174
171
164
174
179
159
164
201
199
202
201
199
209
197
210
225
221
218
221
216
221
227
219
211
197
194
202
190
192
197
193
U
XRF
ppm
221
217
211
215
225
226
219
211
275
261
246
265
252
266
248
240
226
225
222
224
226
220
221
220
209
210
212
210
213
209
211
210
210
200
210
200
210
200
210
200
200
200
190
200
190
200
190
200
200
200
200
200
200
200
200
200
220
240
230
230
240
220
230
230
Ca
M/ICP
ppm
23100
23300
24000
24700
24800
24300
23500
23700
22719
22274
22845
23057
21873
23128
23089
23907
21600
23500
22600
21700
23800
21100
24000
21500
23700
23800
23200
23600
22900
22600
23400
23400
25100
26100
23800
24000
23600
23800
24100
23900
24500
23900
23300
24200
23300
23800
24000
23600
25500
25300
25300
24300
24200
24500
23900
24700
22900
22700
22600
22400
22800
24100
23000
23600
27500
27600
26300
27600
26200
26300
27100
26300
24900
24900
24900
24700
24900
25100
25000
24900
Nb
M/ICP
ppm
20.10
19.90
19.90
20.00
20.20
20.10
19.70
20.00
12.50
11.70
12.20
11.80
13.00
13.20
13.30
13.50
18.30
18.30
18.30
18.50
18.30
17.90
18.10
18.70
19.10
18.50
17.80
19.20
18.60
18.90
18.30
18.40
18.50
18.20
17.60
17.80
17.90
17.90
18.50
18.00
17.90
17.60
17.50
16.50
17.00
17.30
17.40
16.40
17.40
17.00
17.30
17.00
17.00
18.40
17.00
17.70
15.70
17.10
18.50
17.00
16.40
17.20
15.10
15.40
25.00
25.00
20.00
25.00
25.00
25.00
25.00
25.00
Ta
M/ICP
ppm
2.68
2.46
2.35
2.30
2.31
2.46
2.31
2.44
2.12
2.04
2.02
2.08
1.97
1.96
1.98
2.08
2.42
2.31
2.20
2.37
2.33
2.33
2.32
2.30
2.04
2.03
1.95
1.98
1.96
1.96
2.05
1.99
2.16
2.23
2.23
2.10
2.14
2.13
2.24
2.11
2.09
2.07
2.06
2.03
2.00
2.21
2.05
2.15
1.60
1.60
1.60
1.50
1.40
1.30
1.20
1.30
1.60
1.60
1.70
1.60
1.40
1.50
1.60
1.50
Al2O3
XRF
%
12.80
12.80
12.80
12.90
12.80
12.70
12.80
12.80
12.42
12.40
12.23
12.14
12.35
12.31
12.10
12.11
12.90
12.90
12.90
12.90
12.80
12.80
13.00
13.00
12.80
12.80
12.80
13.00
12.70
12.80
12.70
12.90
12.70
12.70
12.65
12.75
12.70
12.70
12.65
12.65
12.70
12.75
12.70
12.75
12.70
12.70
12.65
12.75
13.06
13.03
13.01
13.08
13.08
13.07
13.10
13.03
12.75
12.70
12.65
12.65
12.75
12.75
12.70
12.80
CaO
XRF
%
3.43
3.42
3.43
3.41
3.42
3.44
3.44
3.45
3.35
3.37
3.37
3.37
3.39
3.37
3.41
3.37
3.50
3.52
3.49
3.53
3.45
3.52
3.50
3.52
3.41
3.42
3.43
3.44
3.40
3.41
3.40
3.44
3.43
3.42
3.43
3.45
3.44
3.44
3.43
3.43
3.50
3.51
3.50
3.50
3.49
3.50
3.47
3.51
3.42
3.41
3.43
3.45
3.44
3.45
3.44
3.45
3.43
3.41
3.42
3.40
3.42
3.44
3.43
3.46
Cr2O3
XRF
%
0.07
0.06
0.07
0.07
0.07
0.07
0.07
0.06
0.07
0.07
0.07
0.07
0.06
0.07
0.06
0.07
0.06
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.05
0.04
0.05
0.04
0.05
0.05
0.05
0.05
0.06
0.06
0.06
0.06
0.06
0.07
0.07
0.06
Fe2O3
XRF
%
3.06
3.07
3.06
3.07
3.06
3.05
3.07
3.07
3.15
3.14
3.18
3.15
3.14
3.18
3.16
3.17
3.04
2.91
3.05
3.06
3.03
3.13
3.06
3.08
2.99
2.95
2.95
3.06
2.90
3.05
3.06
3.16
3.01
3.00
3.00
3.01
2.99
3.00
3.00
2.99
2.99
2.98
2.94
2.99
2.94
2.96
3.01
2.95
2.99
3.01
2.98
3.01
3.00
3.01
3.01
3.00
3.02
3.00
2.99
2.98
3.00
3.01
3.01
3.04
K2O
XRF
%
4.47
4.47
4.47
4.48
4.48
4.47
4.49
4.49
4.48
4.51
4.52
4.47
4.50
4.50
4.52
4.51
4.43
4.43
4.43
4.47
4.44
4.44
4.50
4.49
4.37
4.37
4.40
4.42
4.37
4.40
4.40
4.42
4.41
4.43
4.43
4.46
4.43
4.47
4.46
4.47
4.45
4.46
4.45
4.46
4.45
4.45
4.48
4.45
4.33
4.31
4.32
4.35
4.34
4.35
4.35
4.36
4.35
4.32
4.34
4.32
4.35
4.34
4.33
4.37
MgO
XRF
%
1.91
1.90
1.91
1.90
1.91
1.90
1.91
1.92
1.91
1.88
1.87
1.85
1.90
1.88
1.92
1.89
1.93
1.93
1.93
1.94
1.93
1.92
1.95
1.95
1.86
1.85
1.84
1.90
1.83
1.91
1.86
1.88
1.91
1.93
1.94
1.92
1.91
1.95
1.90
1.88
1.96
1.96
1.96
1.96
1.96
1.96
1.98
1.96
1.93
1.91
1.92
1.93
1.92
1.91
1.91
1.92
1.90
1.88
1.88
1.88
1.88
1.90
1.90
1.90
MnO
XRF
%
0.06
0.06
0.06
0.07
0.06
0.06
0.06
0.06
0.07
0.06
0.07
0.07
0.07
0.07
0.07
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
Na2O
XRF
%
3.54
3.51
3.50
3.52
3.54
3.51
3.55
3.52
3.34
3.36
3.35
3.39
3.36
3.32
3.34
3.40
3.50
3.52
3.49
3.53
3.51
3.49
3.53
3.55
3.63
3.61
3.58
3.64
3.55
3.71
3.61
3.67
3.26
3.27
3.27
3.26
3.26
3.27
3.44
3.27
3.42
3.42
3.43
3.42
3.43
3.43
3.43
3.42
3.43
3.39
3.42
3.40
3.42
3.43
3.43
3.44
12.81
12.79
12.86
12.85
12.85
12.90
12.91
12.81
12.80
12.87
12.86
12.83
12.89
12.84
12.86
12.86
3.38
3.39
3.41
3.40
3.41
3.39
3.38
3.40
3.47
3.48
3.49
3.48
3.49
3.47
3.48
3.49
0.06
0.07
0.06
0.06
0.06
0.06
0.06
0.06
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
3.04
3.05
3.06
3.06
3.06
3.06
3.06
3.05
3.03
3.05
3.05
3.04
3.05
3.03
3.04
3.05
4.49
4.47
4.47
4.47
4.47
4.50
4.48
4.48
4.48
4.50
4.50
4.50
4.50
4.49
4.49
4.51
1.93
1.93
1.95
1.92
1.96
1.94
1.96
1.95
1.98
1.99
1.99
1.98
1.98
1.99
1.99
1.99
0.06
0.07
0.07
0.07
0.06
0.07
0.06
0.07
0.06
0.07
0.06
0.06
0.07
0.06
0.06
0.06
3.46
3.44
3.44
3.43
3.48
3.46
3.44
3.45
3.45
3.46
3.47
3.46
3.47
3.44
3.46
3.46
4
P2O5
XRF
%
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
SiO2
XRF
%
68.6
68.6
68.6
68.6
68.6
68.7
68.6
68.6
69.0
69.0
69.5
69.4
68.9
69.4
69.7
69.6
68.4
68.4
68.1
68.5
67.3
68.5
68.4
68.7
68.5
68.2
68.6
68.9
68.1
68.3
68.2
68.4
68.1
68.1
68.1
68.3
68.1
68.2
68.0
68.0
68.8
68.9
69.0
69.0
68.9
68.9
68.7
68.9
68.0
68.2
68.1
68.2
68.0
68.2
68.2
68.0
69.3
68.7
68.9
68.6
69.2
69.1
68.8
69.5
TiO2
XRF
%
0.31
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.31
0.30
0.31
0.30
0.31
0.32
0.29
0.31
0.30
0.31
0.31
0.31
0.30
0.31
0.30
0.30
0.31
0.31
0.31
0.31
0.30
0.34
0.31
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.29
0.30
0.31
0.31
0.30
0.31
0.29
0.31
0.30
0.30
0.30
0.30
0.31
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
0.30
1.31
1.16
1.18
0.96
1.31
1.19
1.20
1.18
1.98
1.99
2.04
2.02
1.96
2.00
2.02
2.13
1.53
1.60
1.62
1.55
1.54
1.58
1.42
1.63
0.14
0.15
0.14
0.15
0.15
0.14
0.14
0.14
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
67.2
67.2
67.6
67.2
67.5
67.6
67.7
67.4
68.5
68.6
68.7
68.6
68.6
68.5
68.6
68.7
0.30
0.30
0.30
0.30
0.31
0.30
0.30
0.30
0.31
0.31
0.31
0.31
0.31
0.31
0.31
0.31
1.96
1.95
1.97
1.97
2.06
2.00
1.98
2.02
1.42
1.44
1.44
1.43
1.44
1.45
1.41
1.41
0.14
0.14
0.14
0.14
0.15
0.15
0.15
0.14
0.14
0.15
0.14
0.15
0.14
0.13
0.14
0.15
LOI
%
1.55
1.52
1.52
1.56
1.59
1.50
1.46
1.50
1.67
1.63
1.68
1.68
1.69
1.69
1.76
1.72
2.00
1.98
2.00
1.95
2.01
1.98
1.98
2.15
2.01
2.02
2.07
2.07
2.03
2.05
1.93
2.01
SG
Pyc
2.54
2.45
2.56
2.42
2.57
2.61
2.58
2.43
2.70
2.68
2.71
2.68
2.69
2.70
2.71
2.69
2.70
2.69
2.71
2.71
2.71
2.68
2.70
2.70
2.53
2.56
2.50
2.57
2.55
2.55
2.54
2.58
2.81
2.74
2.82
2.81
2.81
2.65
2.84
2.65
2.60
2.56
2.52
2.53
2.53
2.52
2.53
2.55
2.78
2.78
2.74
2.81
2.86
2.79
2.86
2.85
2.66
2.66
2.66
2.70
2.73
2.71
2.70
2.70
2.71
2.71
2.71
2.71
2.74
2.74
2.74
2.73
Assay data (cont)
Lab
Code
L
L
L
L
L
L
L
L
M
M
M
M
M
M
M
M
N
N
N
N
N
N
N
N
O
O
O
O
O
O
O
O
Q
Q
Q
Q
Q
Q
Q
Q
R
R
R
R
R
R
R
R
S
S
S
S
S
S
S
S
T
T
T
T
T
T
T
T
U
M/ICP
ppm
U
XRF
ppm
Ca
M/ICP
ppm
Nb
M/ICP
ppm
Ta
M/ICP
ppm
Al2O3
XRF
%
12.80
12.80
12.80
12.80
12.90
12.90
12.90
12.90
CaO
XRF
%
3.52
3.53
3.51
3.51
3.55
3.54
3.51
3.53
Cr2O3
XRF
%
Fe2O3
XRF
%
3.03
3.01
3.02
3.02
3.03
3.04
3.02
3.03
K2O
XRF
%
4.47
4.48
4.48
4.48
4.49
4.51
4.47
4.49
MgO
XRF
%
1.91
1.92
1.90
1.94
1.93
1.95
1.91
1.93
MnO
XRF
%
0.07
0.07
0.07
0.07
0.07
0.07
0.07
0.07
Na2O
XRF
%
3.34
3.34
3.33
3.33
3.36
3.36
3.32
3.34
P2O5
XRF
%
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
SiO2
XRF
%
68.4
68.3
68.2
68.3
68.7
68.7
68.1
68.6
TiO2
XRF
%
0.31
0.31
0.30
0.30
0.30
0.31
0.31
0.30
%
1.23
1.23
1.26
1.23
1.22
1.22
1.22
1.27
182
203
212
187
203
215
187
176
238
229
231
230
233
233
216
230
205
205
205
203
206
206
206
205
25467
25556
25449
25665
25831
26365
25498
25419
15.35
15.09
15.20
15.24
15.74
15.55
15.44
15.64
2.09
1.99
2.01
2.01
2.03
2.00
1.98
2.02
12.75
12.77
12.75
12.84
12.80
12.73
12.83
12.83
3.50
3.50
3.49
3.49
3.48
3.48
3.50
3.48
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
2.98
2.97
2.99
2.99
2.98
3.00
2.98
2.98
4.53
4.51
4.54
4.53
4.55
4.54
4.53
4.53
1.93
1.90
1.90
1.92
1.91
1.93
1.89
1.89
0.06
0.06
0.06
0.06
0.06
0.06
0.06
0.06
3.47
3.43
3.47
3.45
3.44
3.44
3.45
3.40
0.14
0.14
0.14
0.14
0.14
0.14
0.14
0.14
68.2
68.2
68.4
68.5
68.5
68.3
68.4
68.5
0.32
0.31
0.31
0.31
0.31
0.31
0.31
0.31
1.57
1.57
1.55
1.57
1.56
1.56
1.56
1.55
220
220
221
219
219
222
217
225
209
213
210
215
214
217
212
211
192
186
187
184
200
186
193
177
196
203
202
201
200
203
203
200
217
218
218
216
213
213
216
218
2.16
2.02
2.16
2.02
2.02
2.16
2.02
2.16
12.88
12.90
12.90
13.03
12.96
12.91
13.02
12.42
1.89
1.75
1.75
1.75
1.75
1.75
1.89
1.89
3.50
3.48
3.48
3.48
3.52
3.45
3.51
3.52
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
2.29
2.16
2.16
2.16
2.16
2.29
2.29
2.29
2.91
2.93
2.89
2.91
2.92
2.92
2.92
2.93
1.21
1.21
1.21
1.21
1.21
1.21
1.21
1.21
4.23
4.23
4.23
4.23
4.21
4.21
4.22
4.22
0.94
0.94
0.94
0.94
0.94
0.94
1.08
0.94
1.49
1.49
1.50
1.49
1.51
1.47
1.51
1.53
0.05
0.06
0.05
0.06
0.06
0.06
0.06
0.08
0.94
0.67
0.81
0.67
0.81
0.81
1.08
0.81
3.46
3.47
3.51
3.50
3.46
3.40
3.44
3.50
0.15
0.16
0.15
0.15
0.15
0.15
0.15
0.11
68.2
68.9
68.9
68.0
68.8
68.9
68.3
68.8
0.29
0.29
0.30
0.30
0.31
0.31
0.31
0.31
1.90
1.89
1.89
1.88
1.88
1.88
1.92
1.91
26100
26200
26026
25710
25159
24900
24857
25739
16.67
15.83
16.57
16.75
17.22
15.67
16.01
16.87
LOI
SG
Pyc
2.69
2.67
2.76
2.75
2.73
2.72
2.69
2.77
2.76
2.80
2.78
2.77
2.77
2.75
2.79
2.70
2.69
2.68
2.69
2.68
2.69
2.69
2.68
12.
Measurement of Uncertainty: The samples used in the certification process were
selected in such a way as to represent the entire batch of material and were taken from the final
packaged units; therefore all possible sources of uncertainty (sample uncertainty and measurement
uncertainty) are included in the final combined standard uncertainty determination.
The uncertainty measurement takes into consideration the between lab and the within lab
variances and is calculated from the square roots of the variances of these components using the
formula:
Combined standard uncertainty=sqrt((between lab.var/no of labs) + ( mean square within lab.var /no of assays))
These uncertainty measurements may be used, by laboratories, as a component for calculating the
total uncertainty for method validation according to the relevant ISO guidelines.
5
Analyte
U
U
Ca
Nb
Ta
SG
Al2O3
CaO
Fe2O3
K2O
MgO
MnO
Na2O
P2O5
SiO2
TiO2
LOI
Method
M/ICP
XRF
M/ICP
M/ICP
M/ICP
pyc
P
M/ICP
P
M/ICP
P
M/ICP
P
M/ICP
P
M/ICP
M/ICP
Unit
ppm
ppm
ppm
ppm
ppm
%
%
%
%
%
%
%
%
%
%
%
S '
17.1
11.6
1056
1.386
0.151
0.087
0.102
0.046
0.040
0.056
0.033
0.004
0.058
0.005
0.295
0.005
0.232
σ
L
²
14.1
8.7
850
1.271
0.158
0.067
0.070
0.035
0.029
0.045
0.024
0.002
0.051
0.003
0.199
0.002
0.214
SW ³
CSU ⁴
6.1
3.87
530
0.532
0.058
0.032
0.055
0.016
0.019
0.016
0.014
0.002
0.021
0.003
0.186
0.004
0.042
4.30
2.44
275
0.428
0.060
0.020
0.021
0.010
0.009
0.013
0.007
0.001
0.016
0.001
0.063
0.001
0.068
1. S - Std Dev for use on control charts.
2. σ L - Betw Lab Std Dev, for use to calculate a measure of accuracy.
3. S W - Within Lab Stc Dev, for use to calculate a measure of precision.
4. CSU - Combined Standard Uncertainty, a component for use to calculate
the total uncertainty in method validation.
13.
Uncertified values: The Certified, Provisional and Informational values listed on p1 and p2
of this certificate fulfill the AMIS statistical criteria regarding agreement for certification and have
been independently validated by Dr Barry Smee.
14.
Metrological Traceability: The values quoted herein are based on the consensus values
derived from statistical analysis of the data from an inter laboratory measurement program.
Traceability to SI units is via the standards used by the individual laboratories, the majority of which
are accredited, who have maintained measurement traceability during the analytical process.
15.
Certification: AMIS0156 is a new material.
16.
Period of validity: The certified values are valid for this product, while still sealed in its
original packaging, until notification to the contrary. The stability of the material will be subject to
continuous testing for the duration of the inventory. Should product stability become an issue, all
customers will be notified and notification to that effect will be placed on the www.amis.co.za
website.
17.
Minimum sample size: The majority of laboratories reporting used a 0.5g sample size for
the ICP and a 30g sample size for the fire assay. These are the recommended minimum sample
sizes for the use of this material.
18.
Availability: This product is available in Laboratory Packs containing 1kg of material and
Explorer Packs containing custom weights (from 50g to 250g) of material. The Laboratory Packs
are sealed bottles delivered in sealed foil pouches. The Explorer Packs contain material in
standard geochem envelopes, vacuum sealed in foil pouches.
19.
Recommended use: The data used to characterize this CRM has been scrutinized using
outlier treatment techniques. This, together with the number of participating laboratories, should
overcome any “inter-laboratory issues” and should lead to a very accurate measure for the given
methods, notwithstanding the underlying assumption that what the good inter-laboratory labs
reported was accurate. However an amount of bad data might have had an effect, resulting in
limits which in some situations might be too broad for the effective monitoring of a single analytical
method, laboratory or production process. Users should set their own limits based on their own
data quality objectives and control measurements, after determining the performance
characteristics of their own particular method, using a minimum of 20 analyses using this CRM.
User set limits should normally be within the limits recommended on p1 and 2 of this certificate.
6
20.
Legal Notice: This certificate and the reference material described in it have been
prepared with due care and attention. However AMIS, Set Point Technology (Pty) Ltd, Mike
McWha, Dr Barry Smee and Smee and Associates Ltd; accept no liability for any decisions or
actions taken following the use of the reference material.
26 January 2010
Certifying Officers:
African Mineral Standards:_______________________________________
Mike McWha
BSc (Hons), FGSSA, MAusIMM, Pr.Sci.Nat
Geochemist:____________________________________________________
Barry W. Smee
BSc, PhD, P.Geo, (B.C.)
7
Appendix 1. – Uncertified trace element statistics
Twelve of the laboratories reported multi-element scan data. The iterated data is presented below
for informational use.
Analyte
Ag
Al
As
Ba
Be
Bi
Cd
Ce
Co
Cr
Cs
Cu
Dy
Er
Eu
Fe
Ga
Gd
Ge
Hf
Ho
In
K
La
Li
Lu
Mg
Mn
Mo
Na
Nd
Ni
P
Pb
Pr
Rb
S
Sb
Sc
Se
Si
Sm
Sn
Sr
Tb
Te
Th
Ti
Tl
Tm
V
W
Y
Yb
Zn
Zr
Method
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
M/ICP
Unit
ppm
%
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
%
ppm
ppm
ppm
ppm
ppm
ppm
%
ppm
ppm
ppm
%
ppm
ppm
%
ppm
ppm
ppm
ppm
ppm
ppm
%
ppm
ppm
ppm
%
ppm
ppm
ppm
ppm
ppm
ppm
%
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
Mean
0.041
6.67
2.26
226
3.07
0.312
0.200
46.3
89.8
331
4.07
104
6.33
4.44
0.592
2.10
18.3
4.21
0.145
2.01
1.36
0.031
3.47
24.3
26.5
0.735
1.06
462
3.75
2.41
17.4
38.6
633
37.6
5.16
274
0.119
8.55
5.43
1.43
46.6
4.14
5.90
144
0.871
0.200
30.7
0.178
0.935
0.753
45.5
12.3
33.0
4.97
108
53.0
8
2SD
0.026
0.41
0.94
18
0.43
0.034
0.022
2.4
10.2
73
0.35
11
0.43
0.25
0.057
0.21
1.0
0.37
0.063
0.25
0.16
0.008
0.34
2.4
4.4
0.091
0.12
53
0.40
0.26
1.7
3.1
62
6.2
1.06
22
0.011
1.67
1.41
0.93
29.7
0.42
0.48
10
0.101
RSD%
32.0
3.1
20.8
3.9
7.0
5.4
5.5
2.6
5.7
11.0
4.3
5.3
3.4
2.8
4.8
4.9
2.7
4.3
21.7
6.3
5.9
12.0
4.9
4.9
8.2
6.2
5.5
5.7
5.4
5.4
4.8
4.0
4.9
8.2
10.3
4.1
4.8
9.8
13.0
32.5
31.8
5.0
4.1
3.6
5.8
2.7
0.013
0.142
0.084
4.2
2.8
4.1
0.78
7
12.5
4.4
3.6
7.6
5.6
4.6
11.2
6.3
7.8
3.1
11.8
n
28
53
49
93
69
61
53
51
85
78
54
86
23
23
22
95
46
22
39
48
24
50
77
55
68
23
79
93
59
88
23
70
84
79
23
53
72
70
31
48
16
23
58
93
22
8
69
69
64
23
71
61
77
30
86
63