AMIS0454 Certified Reference Material. Certificate of Analysis
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1 Tel: +27 (0) , Fax: +27 (0) , web: 11 Gewel Street (off Hulley Road), D1 Isando Business Park, Kempton Park, 1609 P.O. Box 856, Isando, 1600, Gauteng, South Africa, a division of the Set Point Group AMIS0454 Certified Reference Material Ilmenite, mineral sand concentrate, Tronox Mineral Sands (Namakwa Sands) Mine, South Africa Certificate of Analysis Recommended Concentrations and Limits 1. (at two Standard Deviations) Certified Concentrations 2. Fe XRF ± 0.60 % Fe Titration ± 0.84 % Fe M/ICP per ± 3.14 % Ti XRF ± 0.16 % Al M/ICP 3700 ± 242 ppm Ca M/ICP 1521 ± 122 ppm Mn M/ICP 9090 ± 764 ppm Specific Gravity 4.63 ± 0.11 Provisional Concentrations Mg M/ICP 4414 ± 542 ppm Nb M/ICP 576 ± 82 ppm Nb 2 O 5 XRF 0.09 ± 0.01 % V 2 O 5 XRF 0.24 ± 0.03 % ZrO 2 XRF 0.12 ± 0.02 % Informational Concentrations Cr M/ICP 713 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 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), A Buddingh, K Gerber, SJ Ingram M McWha, N Robinson, V Singh (Alt), MH Snelling, J Vassiloudis
2 Major Element Recommended Concentrations and Limits (at two Standard Deviations) Certified Concentrations Al 2 O ± % CaO ± % Fe 2 O ± 0.83 % MgO 0.74 ± 0.08 % MnO 1.19 ± 0.03 % SiO ± 0.05 % TiO ± 0.56 % Provisional Concentrations Cr 2 O ± % K 2 O ± % P 2 O ± % Informational Concentrations Na 2 O 0.03 % 1. Intended Use: AMIS0454 can be used to check analysis of samples of ilmenite from heavy mineral sands 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: The raw material for AMIS0454 is ilmenite from the Tronox Mineral Sands (Namakwa Sands) Mine, situated at Brand-se-Baai, 385 km north of Cape Town in the Northern Cape Province, South Africa. The ore is mined and processed at primary concentration plants to produce a mineral concentrate. It undergoes further processing at the secondary concentration plant to yield a magnetic and non-magnetic stream. These concentrates are then put through a Mineral Separation Plant where the minerals in the streams are separated to produce zircon, rutile and ilmenite. 3. Mineral and Chemical Composition: Ilmenite is the titanium-iron oxide mineral with the idealized formula FeTiO 3. Ilmenite is mined primarily for the production of titanium dioxide. 4. Appearance: The material is a very fine Dusky brown powder (Corstor 5YR 2.5/2). 2
3 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. 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. Fe, Ti by XRF 2. Fe, Ti by Titration 3. Multi-acid digest, multi element scan, to include Fe, Ti, Ca, Al, Mg, Si, Mn, V, Zr, Cr, Nb, Ta: ICP-OES 4. Major elements by XRF fusion (Al 2 O 3, CaO, Cr 2 O 3, Fe 2 O 3, K 2 O, MgO, MnO, Na 2 O, SiO 2, TiO 2, ZrO 2, V 2 O 5, Nb 2 O 5, Ta 2 O 5, LOI) 5. SG Gas Pycnometer 8. Information requested: 1. State and provide brief description of analytical techniques used. 2. State aliquots used for all determinations. 3. Results for individual analyses to be reported. 4. Report all QC data, to include replicates, blanks and certified reference materials used. 9. Method of Certification: Thirty One laboratories were each given eight randomly selected packages of sample. Thirty of the laboratories submitted results in time for certification. 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 then 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: The 30 out of 31 laboratories that provided results timeously were (not in same order as in the table of assays): 1. ACME Vancouver (Canada) 2. ALS Ammtec (Australia) 3. ALS Chemex Laboratory Group (Brisbane Australia) 4. ALS Chemex Laboratory Group (Vancouver Canada) 5. BV Amdel (Australia) 6. Exarro (South Africa) 3
4 7. Hazen Research (United States) 8. Intertek Testing Services Ltd Shanghai (Beijing) 9. Intertek Tianjin (China) 10. Intertek Utama Services (Indonesia) 11. Kenmare Moma Laboratory (Mozambique) 12. Labtium Mining Laboratory Services (Finland) 13. Richards Bay Minerals ( South Africa) 14. Sci-Ba Laboratories (South Africa) 15. Set Point Laboratories (Isando, South Africa) 16. SGS Australia Pty Ltd (Newburn, West Australia) 17. SGS Geosol Laboratories Ltda (Brazil) 18. SGS Mineral Services Callao (Peru) 19. SGS Mineral Services Lakefield (Canada) 20. SGS Booysens (South Africa) 21. SGS Vancouver (Canada) 22. Tronox Chandala (Australia) 23. Tronox KZN ( South Africa) 24. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 1 (South Africa) 25. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 2 (South Africa) 26. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 1 (South Africa) 27. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 2 (South Africa) 28. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 1 (South Africa) 29. Tronox Mineral Sands (Namakwa Sands) Mine, Dataset 2 (South Africa) 30. Ultra Trace (Pty) Ltd (West Australia) 11. Assay Data: Data as received from the laboratories for the important certified elements listed on p1 is set out below. Economic elements assay data Lab Fe Fe Fe Ti Al Ca Cr Mg Mn Nb Code XRF Titration M/ICP XRF M/ICP M/ICP M/ICP M/ICP M/ICP M/ICP % % % % ppm ppm ppm ppm ppm ppm A 37.9 A 37.9 A 37.7 A 37.3 A 37.3 A 37.4 A 37.2 A 37.2 C C C C C C C C E 26.6 E 26.6 E 26.8 E 26.6 E 26.4 E 26.5 E 26.6 E
5 Economic elements assay data (cont) Lab Fe Fe Fe Ti Al Ca Cr Mg Mn Nb Code XRF Titration M/ICP XRF M/ICP M/ICP M/ICP M/ICP M/ICP M/ICP % % % % ppm ppm ppm ppm ppm ppm F F F F F F F F G G G G G G G G I I I I I I I I J J J J J J J J L L L L L L L L N N N N N N N N Q Q Q Q Q Q Q Q
6 Economic elements assay data (cont) Lab Fe Fe Fe Ti Al Ca Cr Mg Mn Nb Code XRF Titration M/ICP XRF M/ICP M/ICP M/ICP M/ICP M/ICP M/ICP % % % % ppm ppm ppm ppm ppm ppm R R R R R R R R S S S S S S S S U U U U U U U U W W W W W W W W Y 26.7 Y 26.7 Y 26.8 Y 26.8 Y 26.7 Y 26.8 Y 26.8 Y 26.8 ZA ZA ZA ZA ZA ZA ZA ZA ZB ZB ZB ZB ZB ZB ZB ZB ZE 33.7 ZE 33.8 ZE 33.8 ZE 34.0 ZE 34.0 ZE 34.1 ZE 34.0 ZE
7 Major Oxides assay data Lab Al 2O 3 CaO Cr 2O 3 Fe 2O 3 K 2O MgO MnO Na 2O P 2O 5 Nb 2O 5 SiO 2 TiO 2 V 2O 5 ZrO 2 SG Code XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF pyc % % % % % % % % % % % % % % A A A A A A A A B B B B B B B B 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 4.62 I 4.63 I 4.52 I 4.60 I 4.52 I 4.57 I 4.53 I 4.62 K K K K K K K K L 4.51 L 4.56 L 4.64 L 4.57 L 4.58 L 4.59 L 4.54 L
8 Major Oxides assay data (cont) Lab Al 2O 3 CaO Cr 2O 3 Fe 2O 3 K 2O MgO MnO Na 2O P2O5 Nb 2O 5 SiO 2 TiO 2 V 2O 5 ZrO 2 SG Code XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF pyc % % % % % % % % % % % % % % M M M M M M M M N N N N N N N N P P P P P P P P Q Q Q Q Q Q Q Q R R R R R R R R T T T T T T T T U U U U U U U U V V V V V V V V W W W W W W W W X X X X X X X X
9 Major Oxides assay data (cont) Lab Al 2O 3 CaO Cr 2O 3 Fe 2O 3 K 2O MgO MnO Na 2O P2O5 Nb 2O 5 SiO 2 TiO 2 V 2O 5 ZrO 2 SG Code XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF pyc % % % % % % % % % % % % % % Y Y Y Y Y Y Y Y Z Z Z Z Z Z Z Z ZA ZA ZA ZA ZA ZA ZA ZA ZB ZB ZB ZB ZB ZB ZB ZB ZC ZC ZC ZC ZC ZC ZC ZC ZD ZD ZD ZD ZD ZD ZD ZD ZE ZE ZE ZE ZE ZE ZE ZE Measurement of Uncertainty :(ref Dr Hugh Bartlett, Hugh Bartlett Consulting CC.) The samples used in this certification process have been 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. 9
10 Analyte Method Unit S ' σl ² SW ³ CSU ⁴ Fe XRF % Fe Titration % Fe M/ICP % Ti XRF % Al M/ICP ppm Ca M/ICP ppm Cr M/ICP ppm Mg M/ICP ppm Mn M/ICP ppm Nb M/ICP ppm Al2O3 XRF % CaO XRF % Cr 2 O 3 XRF % Fe2O3 XRF % K2O XRF % MgO XRF % MnO XRF % Na2O XRF % Nb 2 O 5 XRF % P 2 O 5 XRF % SiO2 XRF % TiO2 XRF % V 2 O 5 XRF % ZrO 2 XRF % SG pyc 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 Std 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 Margaret Fairhurst. 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: AMIS0454 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 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. 10
11 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. 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, and Margaret M. Fairhurst; accept no liability for any decisions or actions taken following the use of the reference material. 25 November 2014 Certifying Officers: African Mineral Standards: Mike McWha BSc (Hons), FGSSA, MAusIMM, Pr.Sci.Nat Geochemist: Margaret M. Fairhurst, PG, MAusIMM Oreval 11
12 Appendix - uncertified trace element statistics Analyte Method Unit Mean 2SD RSD% n Ag M/ICP ppm As M/ICP ppm Ba M/ICP ppm Be M/ICP ppm Bi M/ICP ppm Cd M/ICP ppm Ce M/ICP ppm Co M/ICP ppm Cs M/ICP ppm Cu M/ICP ppm Dy M/ICP ppm Er M/ICP ppm Eu M/ICP ppm Ga M/ICP ppm Gd M/ICP ppm Hf M/ICP ppm Ho M/ICP ppm In M/ICP ppm K M/ICP % La M/ICP ppm Li M/ICP ppm Lu M/ICP ppm Mo M/ICP ppm Na M/ICP % Nd M/ICP ppm Ni M/ICP ppm P M/ICP ppm Pb M/ICP ppm Pr M/ICP ppm Rb M/ICP ppm S M/ICP % Sb M/ICP ppm Sc M/ICP ppm Si M/ICP ppm Sm M/ICP ppm Sn M/ICP ppm Sr M/ICP ppm Ta M/ICP ppm Ta 2 O 5 XRF % Tb M/ICP ppm Th M/ICP ppm Ti Titration % Ti M/ICP % Tm M/ICP ppm U M/ICP ppm V M/ICP ppm W M/ICP ppm Y M/ICP ppm Yb M/ICP ppm Zn M/ICP ppm
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