African Mineral Standards

Tel: +2711 923 7000 ax: +2711 923 7027 e-mail: info@amis.co.za web: www.amis.co.za 30 lectron Avenue, sando, 1600. P.O. ox 856, sando, 1600, South Africa. A Division of Set Point ndustrial Technology ( Pty ) Ltd. Reg.No. 1989/000201/07. African Mineral Standards Nickel-Copper Sulphide Standard Nkomati Mine South Africa AMS0073 Certificate of Analysis Recommended Concentration and two etween Laboratory Standard Deviations Certified Concentrations conomic lements Co (M/CP) 277 ± 17 ppm Cu (P) 2370 ± 200 ppm Cu (M/CP) 2414 ± 210 ppm Cu (XR) 2454 ± 100 ppm Ni (P) 5316 ± 418 ppm Ni (M/CP) 5459 ± 368 ppm Ni (XR) 5723 ± 212 ppm Pt (Pb Collection) 0.33 ± 0.03 g/t Pd (Pb Collection) 0.89 ± 0.06 g/t Specific Gravity 3.04 ± 0.18 g/cc Major lements Al 2 O 3 4.72 ± 0.14 % CaO 10.27 ± 0.34 % Cr 2 O 3 0.47 ± 0.02 % e 2 O 3 18.22 ± 0.62 % K 2 O 0.46 ± 0.02 % LO 7.04 ± 0.54 % MgO 17.11 ± 0.40 % MnO 0.21 ± 0.02 % SiO 2 39.42 ± 0.64 % TiO 2 0.35 ± 0.02 % Directors: G Horsfield (CO), MD vers (CO)(ritish), ND Kennelly, S ngram, MC Louw, Dr C Rademeyer, N Robinson, M Smith, MH Snelling, Vassiloudis, D Williams

Provisional Concentrations conomic lements Au (Pb Collection) 0.063 ± 0.01 g/t Co (P) 260 ± 40 ppm Co (XR) 315 ± 72 ppm Major lements Na 2 O 0.43 ± 0.06 % P 2 O 5 0.04 ± 0.01 % S 4.53 ± 0.70 % ntended use: AMS0073 is suitable for monitoring the accuracy of a single analysis of nickel-copper sulphide ores hosted by mafic-ultramafic rocks. The material can be used for routine quality control by inserting within a batch of samples. The recommended mean and "etween Lab" standard deviations for this standard reflect the average 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 and this is acceptable. Good laboratories however will report results within the two standard deviation levels with a failure of <10 %. Origin of material: The material for this standard was provided by the Nkomati Nickel Mine, a joint venture between ARM Platinum and Norilsk Nickel Africa (Pty) Ltd. The mine is situated in the Machadodorp area, Mpumalanga, approximately 300 km east of ohannesburg in South Africa. Mineral and chemical composition: Minearalisation at Nkomati occurs in a number of distinct zones within the Uitkomst Complex, a layered mafic-ultramafic intrusion exposed in a broad valley dissecting the Transvaal Sequence. conomic sulphide mineralization occurs as disseminations, blebs and stringers in three zones, namely the asal Mineralised Zone (MZ), in the asal Gabbro; the Main Mineralised Zone (MMZ), in the Lower Pyroxenite, and the Chromititic Peridotite Mineralised Zone (PCMZ), in the Chromititic Peridotite. The Massive Sulphide ody (MS), which was situated mainly in the granite basement below the Uitkomst Complex has been mined out. AMS0073 is made from Main Mineralised Zone (MMZ) material, which is a heterogeneous unit consisting mainly of altered pyroxenites and harzburgites with calc-silicate xenoliths. Appearance: The material is a very fine powder coloured lueish Grey (Corstor 5P 5/1). Method of preparation: The material was crushed, dry-milled and air-classified to 100% <54um. Wet sieve particle size analysis of random samples confirmed the material was 100% <54um. t was then blended in a bi-conical mixer, systematically divided and then sealed into 1kg Laboratory Packs. Samples were randomly selected for homogeneity testing and third party analysis. Statistical analysis for the consensus test results were carried out by an independent statistician. xplorer Packs are subdivided from the Laboratory packs as required. 2

Methods of analysis requested: 1. Au, Pt, Pd Pb collection CP-OS or CP-MS. 2. Multi-acid digest multi-element scan - ( to include Co, Cu, Ni. ). CP-OS or CP-MS. 3. Aqua regia digest - Co, Cu, Ni. CP-OS or CP-MS. 4. Co, Cu, Ni. XR. 5. Majors ( Al 2 O 3, CaO, Cr 2 O 3, e 2 O 3, K 2 O, MgO, MnO, Na 2 O, SiO 2, TiO 2. LO. ) XR fusion. 6. SG ( gas pycnometer ) Method of certification: Twenty three laboratories were each given eight randomly selected packages of sample. The results from the eighteen laboratories that issued results timeously were used for the certification. ourteen of those laboratories also returned major element data that could be certified and trace element data that was not certified but which is reported as an appendix. The mean and standard deviation for all data was calculated. Outliers were defined as samples beyond the mean ± 2 Standard Deviations from all data. These outliers were removed from the data and a new mean and standard deviation was determined. Standards with an RSD of near or less than 5 % are then certified, RSD s of between near 5 % and 15 % are given Provisional Concentrations and limits, those with RSD s over 15 % are given ndicated Concentrations. This method is different from that used to calculate the Confidence nterval shown on many Government-produced standards in that the actual between-laboratory standard deviation is used in the calculations. This produces upper and lower limits that reflect actual individual analyses rather than a grouped set of analyses. The limits can therefore be used to monitor accuracy from individual analyses, unlike the Certified Limits published on other standards which quote a Confidence nterval. Participating laboratories: (Not in same order as in the table of assays) 1. ACM Analytical Laboratories Ltd CA 2. Activation Laboratories Pty Ltd (ActLabs) CA 3. ALS Chemex Laboratory Group ohannesburg SA 4. ALS Chemex Laboratory Group Perth WA 5. ALS Chemex Laboratory Group Vancouver CA 6. Ammtec Limited WA 7. Anglo Research (Crown Campus) 8. Assayers Canada 9. Geoscience Laboratories (GO LAS) CA 10. ntertek Testing Services Ltd Shanghai (TS eijing) 11. ntertek Utama Services (ndonesia) 12. Labtium nc inland 13. Nkomati V Laboratory SA 14. OMAC Laboratories Limited (reland) 15. Set Point Laboratories (sando) SA 16. SGS Australia Pty Ltd (Newburn) WA 17. SGS Mineral Services Lakefield (Canada) 18. Ultra Trace (Pty) Ltd WA 3

Assay Data: Data as received from the laboratories is set out below. A proficiency report has been sent to the managers of the participating laboratories. Lab Au Co Co Co Cu Cu Cu Ni Ni Ni Pd Pt SG Al2O3 CaO Cr2O3 e2o3 K2O LO MgO MnO Na2O P2O5 S SiO2 TiO2 Code g/t ppm ppm ppm ppm ppm ppm ppm ppm ppm g/t g/t g/cc % % % % % % % % % % % % % (PbColl) (M/CP) (P) (XR) (M/CP) (P) (XR) (M/CP) (P) (XR) (PbColl) (PbColl) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) A 0.07 305 320 2370 2440 5720 5740 0.91 0.36 4.78 10.40 0.48 18.70 0.46 6.70 16.90 0.21 0.46 4.75 39.59 0.34 A 0.07 310 320 2400 2440 5730 5730 0.92 0.36 4.77 10.40 0.48 18.60 0.46 6.80 16.90 0.21 0.45 4.75 39.52 0.34 A 0.07 310 330 2410 2450 5740 5740 0.92 0.35 4.75 10.50 0.49 18.70 0.46 6.74 16.90 0.21 0.46 4.79 39.49 0.35 A 0.06 305 320 2400 2460 5750 5750 0.91 0.35 4.75 10.50 0.49 18.60 0.46 6.78 16.90 0.21 0.45 4.83 39.34 0.35 A 0.06 305 320 2390 2430 5700 5720 0.91 0.35 4.75 10.50 0.48 18.60 0.46 6.77 16.90 0.21 0.46 4.75 39.63 0.34 A 0.06 310 320 2370 2440 5770 5740 0.92 0.36 4.76 10.40 0.48 18.60 0.46 6.69 16.90 0.21 0.46 4.75 39.54 0.34 A 0.06 310 330 2390 2450 5720 5760 0.92 0.35 4.77 10.40 0.49 18.70 0.46 6.76 16.90 0.21 0.47 4.79 39.55 0.34 A 0.06 315 320 2410 2450 5750 5740 0.92 0.35 4.74 10.50 0.49 18.70 0.46 6.82 16.90 0.21 0.47 4.75 39.43 0.35 C 0.08 303 2396 5572 0.96 0.36 4.46 C 0.07 314 2387 5521 0.96 0.36 4.54 C 0.07 308 2390 5524 0.95 0.34 4.52 C 0.07 300 2418 5619 0.96 0.36 4.64 C 0.07 301 2361 5504 0.96 0.35 4.55 C 0.07 327 2372 5505 0.97 0.36 4.47 C 0.07 308 2354 5470 0.96 0.35 4.53 C 0.07 306 2412 5563 0.94 0.35 4.27 D 0.05 2500 2500 6100 5840 0.90 0.31 1.00 D 0.06 2500 2480 6100 5820 0.90 0.32 1.00 D 0.06 2400 2530 6100 5910 0.90 0.33 1.00 D 0.06 2400 2500 6000 5850 0.89 0.32 1.00 D 0.06 2300 2460 6000 5730 0.92 0.33 1.00 D 0.06 2200 2480 5800 5810 0.90 0.31 1.00 D 0.06 2200 2420 5800 5670 0.91 0.33 1.00 D 0.06 2200 2580 5900 5910 0.91 0.33 1.00 G 270 2320 5600 G 280 2290 5650 G 270 2200 5440 G 280 2290 5690 G 280 2230 5600 G 270 2200 5540 G 280 2240 5650 G 280 2160 5490 H 0.08 271 251 2422 2327 5420 5070 0.90 0.33 3.18 5.16 H 0.07 253 251 418 2307 2301 2611 5398 5062 5901 0.90 0.33 3.17 4.69 9.08 0.42 18.66 0.41 7.48 17.12 0.20 0.56 0.04 4.70 40.64 0.35 H 0.06 260 246 399 2340 2289 2684 5383 4981 5219 0.87 0.31 3.18 4.71 9.11 0.42 18.71 0.41 7.34 17.39 0.20 0.56 0.04 4.72 40.72 0.35 H 0.06 268 248 351 2471 2285 2612 5386 5045 5796 0.86 0.32 3.15 4.64 9.17 0.42 18.81 0.40 7.47 17.42 0.20 0.55 0.04 4.92 40.35 0.35 H 0.07 273 257 397 2523 2377 2508 5361 5262 5900 0.86 0.31 3.18 4.62 9.07 0.42 18.53 0.41 7.52 17.28 0.20 0.56 0.04 4.96 40.00 0.34 H 0.06 284 239 385 2579 2229 2566 5634 4879 5987 0.88 0.31 3.17 4.69 9.07 0.42 18.73 0.41 7.47 17.18 0.20 0.56 0.04 5.19 40.62 0.36 H 0.07 261 238 2366 2299 5391 4899 0.89 0.32 3.18 4.77 H 0.07 263 245 2461 2257 5371 4943 0.92 0.32 3.16 4.75 K 241 230 2476 2434 5211 4510 3.99 K 236 226 2532 2372 5132 4483 3.93 K 241 225 2517 2395 5214 4499 3.98 K 245 226 2509 2291 5288 4341 3.97 K 245 227 2504 2350 5336 4454 3.93 K 243 227 2399 2304 5220 4350 3.94 K 248 231 2437 2338 5093 4506 4.00 K 246 228 2340 2445 5359 4488 3.93 L 0.07 281 203 200 2350 2110 5280 4270 4900 0.86 0.32 4.80 10.20 0.45 17.90 0.45 6.70 17.00 0.19 0.42 0.04 4.62 39.50 0.34 L 0.06 278 201 200 2380 2100 5330 4190 4900 0.86 0.34 4.80 10.20 0.44 17.80 0.45 6.70 16.80 0.20 0.45 0.04 4.69 39.40 0.34 L 0.07 281 202 200 2330 2090 5220 4190 4900 0.87 0.33 4.78 10.20 0.45 17.90 0.46 6.80 17.00 0.19 0.47 0.04 4.61 39.60 0.34 L 0.07 282 197 200 2370 2050 5300 4210 5000 0.86 0.33 4.79 10.20 0.45 17.70 0.46 6.80 17.00 0.19 0.47 0.04 4.65 39.50 0.35 L 0.07 281 199 200 2360 2060 5190 4110 5000 0.88 0.33 4.79 10.20 0.44 17.90 0.45 6.80 17.00 0.20 0.47 0.04 4.70 39.60 0.35 L 0.06 282 199 300 2330 2060 5290 4160 4900 0.85 0.36 4.83 10.10 0.45 17.90 0.45 6.80 16.80 0.19 0.45 0.05 4.41 39.50 0.34 L 0.07 286 199 200 2400 2060 5390 4130 4900 0.89 0.35 4.76 10.20 0.45 17.80 0.45 6.80 16.90 0.20 0.44 0.04 4.64 39.40 0.34 L 0.07 278 200 200 2380 2080 5330 4070 4900 0.83 0.32 4.77 10.20 0.46 17.80 0.45 6.80 17.00 0.19 0.44 0.05 4.70 39.60 0.34 M 0.09 280 260 340 2400 2400 2400 5400 5300 5800 0.93 0.36 3.08 4.67 10.40 0.48 18.00 0.45 7.51 17.10 0.22 0.45 0.04 39.00 0.35 M 0.07 270 250 400 2500 2300 2400 5500 5200 5700 0.89 0.33 3.10 4.67 10.40 0.47 17.90 0.45 7.32 17.10 0.21 0.37 0.03 39.00 0.36 M 0.07 290 250 370 2500 2300 2400 5600 5000 5700 0.91 0.36 3.06 4.64 10.30 0.47 17.90 0.46 7.31 17.10 0.21 0.41 0.04 39.20 0.36 M 0.08 280 250 350 2400 2300 2400 5400 5100 5700 0.92 0.36 3.09 4.69 10.40 0.48 17.70 0.45 7.42 17.20 0.22 0.35 0.04 39.10 0.35 M 0.10 280 250 370 2500 2300 2500 5600 5200 5700 0.93 0.35 3.08 4.68 10.40 0.47 17.90 0.45 7.38 17.00 0.21 0.30 0.03 39.10 0.35 M 0.08 280 250 360 2500 2300 2400 5500 5200 5600 0.93 0.36 3.09 4.68 10.50 0.48 18.00 0.46 7.25 17.20 0.21 0.45 0.04 39.00 0.35 M 0.09 280 250 330 2400 2300 2300 5500 5300 5700 0.94 0.38 3.08 4.66 10.30 0.46 17.70 0.45 7.28 17.20 0.21 0.41 0.04 39.00 0.35 M 0.11 280 250 390 2400 2300 2400 5400 5300 5700 0.92 0.39 3.06 4.69 10.40 0.47 17.90 0.47 7.39 17.10 0.21 0.39 0.04 39.20 0.35 N 0.07 279 240 300 2340 2220 2500 5950 5800 0.90 0.33 4.70 10.30 0.47 18.30 0.46 6.91 16.90 0.21 0.47 4.55 39.70 0.35 N 0.06 272 241 300 2320 2230 2500 6000 5800 0.87 0.32 4.68 10.30 0.46 18.20 0.46 6.97 16.90 0.21 0.46 4.38 39.60 0.35 N 0.06 258 235 300 2320 2300 2500 5950 5800 0.90 0.33 4.69 10.30 0.47 18.20 0.46 6.93 16.90 0.21 0.48 4.07 39.70 0.36 N 0.07 269 241 300 2320 2220 2500 5990 5800 0.91 0.33 4.68 10.30 0.47 18.30 0.46 6.92 16.80 0.21 0.47 4.35 39.60 0.36 N 0.06 256 239 300 2400 2230 2500 5960 5800 0.90 0.33 4.68 10.30 0.47 18.30 0.47 6.89 16.90 0.21 0.47 4.14 39.60 0.35 N 0.06 247 239 300 2390 2240 2500 5940 5800 0.90 0.33 4.68 10.30 0.47 18.30 0.47 6.92 16.90 0.21 0.46 3.97 39.70 0.35 N 0.06 248 237 300 2380 2230 2400 5900 5800 0.89 0.32 4.70 10.20 0.47 18.30 0.46 6.96 16.90 0.21 0.47 3.99 39.60 0.35 N 0.07 257 239 300 2460 2270 2500 5990 5800 0.94 0.33 4.70 10.30 0.47 18.30 0.47 6.94 16.80 0.21 0.47 4.24 39.60 0.35 4

Assay Data (cont): Lab Au Co Co Co Cu Cu Cu Ni Ni Ni Pd Pt SG Al2O3 CaO Cr2O3 e2o3 K2O LO MgO MnO Na2O P2O5 S SiO2 TiO2 Code g/t ppm ppm ppm ppm ppm ppm ppm ppm ppm g/t g/t g/cc % % % % % % % % % % % % % (PbColl) (M/CP) (P) (XR) (M/CP) (P) (XR) (M/CP) (P) (XR) (PbColl) (PbColl) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) (XR) O 0.05 275 289 2640 2540 5390 5720 0.87 0.33 3.01 4.80 9.85 0.47 18.25 0.46 7.13 17.25 0.21 0.44 0.02 5.63 39.20 0.33 O 0.05 266 276 2620 2280 5360 5480 0.86 0.33 2.91 4.81 9.88 0.47 18.30 0.46 7.22 17.30 0.21 0.44 0.03 5.46 39.30 0.34 O 0.05 269 281 2570 2550 5320 5380 0.88 0.32 3.02 4.83 9.94 0.47 18.45 0.46 7.23 17.40 0.21 0.44 0.03 5.52 39.50 0.34 O 0.08 267 289 2560 2670 5270 5770 0.96 0.32 2.97 4.83 9.99 0.48 18.80 0.47 7.31 17.40 0.21 0.43 0.03 5.40 39.60 0.34 O 0.07 270 275 2600 2590 5340 5440 0.87 0.33 2.80 4.85 10.00 0.48 18.55 0.46 7.10 17.50 0.21 0.44 0.02 5.52 39.80 0.34 O 0.10 269 298 2520 2770 5360 6090 0.97 0.32 3.02 4.82 9.96 0.47 18.45 0.45 7.22 17.40 0.21 0.43 0.03 5.43 39.60 0.34 O 0.05 265 281 2530 2420 5220 5510 0.87 0.33 3.30 4.82 10.05 0.47 18.55 0.46 7.14 17.45 0.21 0.43 0.03 5.44 39.60 0.34 O 0.05 263 283 2510 2470 5110 5450 0.84 0.33 2.99 4.85 10.10 0.48 18.65 0.46 7.15 17.50 0.21 0.43 0.03 5.45 39.80 0.34 P 0.06 277 272 2580 2620 5560 5300 0.89 0.35 3.06 4.81 10.29 0.47 18.13 0.48 7.16 17.18 0.21 0.44 0.05 4.66 39.56 0.35 P 0.06 277 279 2600 2740 5750 5380 0.84 0.33 3.02 4.80 10.24 0.47 18.15 0.48 7.14 17.17 0.21 0.44 0.05 4.73 39.52 0.35 P 0.06 283 274 2720 2670 5750 5230 0.82 0.32 3.11 4.80 10.22 0.47 18.12 0.47 7.17 17.16 0.21 0.44 0.05 4.79 39.45 0.35 P 0.06 282 274 2690 2690 5690 5320 0.87 0.34 3.11 4.79 10.24 0.47 18.16 0.47 7.10 17.18 0.21 0.44 0.05 4.78 39.51 0.35 P 0.06 289 269 2780 2630 5880 5160 0.87 0.34 3.05 4.81 10.23 0.47 18.13 0.48 7.04 17.17 0.21 0.44 0.05 4.90 39.53 0.35 P 0.06 275 270 2650 2610 5530 5220 0.85 0.33 3.10 4.80 10.26 0.47 18.14 0.48 7.11 17.20 0.21 0.43 0.05 4.64 39.54 0.35 P 0.06 285 275 2650 2660 5720 5320 0.87 0.31 3.05 4.79 10.23 0.47 18.13 0.47 7.18 17.18 0.21 0.44 0.05 4.80 39.51 0.35 P 0.06 277 272 2630 2710 5550 5210 0.85 0.33 3.08 4.79 10.25 0.47 18.12 0.47 7.23 17.19 0.21 0.44 0.05 4.74 39.51 0.35 Q 274 240 2470 2310 5090 4970 5500 0.87 0.32 2.96 4.54 10.20 0.42 17.55 0.46 1.50 16.10 0.16 0.34 4.75 38.40 0.35 Q 267 252 2450 2370 5140 5000 5500 0.77 0.30 2.93 4.46 10.10 0.40 17.35 0.44 1.85 16.05 0.16 0.34 4.71 38.60 0.36 Q 272 244 2450 2370 5270 5090 5600 0.90 0.34 2.87 4.53 10.15 0.40 17.40 0.44 1.89 15.80 0.16 0.34 4.70 38.40 0.35 Q 267 249 2420 2350 5010 5200 5500 0.91 0.35 2.94 4.43 10.10 0.41 17.40 0.44 2.20 15.85 0.16 0.37 4.65 38.20 0.35 Q 272 256 2500 2480 5170 5270 5600 0.91 0.33 2.99 4.38 9.83 0.40 16.90 0.43 5.12 15.30 0.16 0.33 4.82 36.90 0.33 Q 265 256 2450 2480 5010 5320 5500 0.90 0.34 2.92 4.65 10.85 0.45 18.55 0.47 6.23 16.85 0.17 0.39 4.67 40.90 0.36 Q 262 258 2430 2480 4970 5220 5500 0.88 0.31 2.94 4.19 9.76 0.40 16.70 0.42 5.99 15.20 0.15 0.32 4.66 36.80 0.33 Q 263 258 2410 2450 4720 5380 5600 0.88 0.33 2.92 4.84 10.70 0.43 18.25 0.47 6.22 16.90 0.17 0.36 4.60 40.80 0.38 R 0.06 279 282 2230 2510 2429 5280 5380 5757 0.92 0.32 4.73 9.94 18.26 0.45 17.70 0.19 0.40 0.04 3.99 39.70 0.34 R 0.06 285 278 2310 2490 2451 5420 5320 5739 0.90 0.31 4.73 9.94 18.25 0.45 17.60 0.19 0.40 0.04 3.99 39.60 0.35 R 0.07 279 277 2260 2470 2471 5360 5280 5790 0.92 0.32 4.76 10.00 18.36 0.45 17.70 0.19 0.39 0.04 4.01 39.90 0.35 R 0.07 278 282 2220 2500 2501 5290 5350 5769 0.91 0.31 4.78 10.01 18.40 0.45 17.70 0.19 0.41 0.04 4.09 39.80 0.35 R 0.06 287 278 2330 2470 2483 5460 5270 5875 0.90 0.31 4.76 10.06 18.59 0.45 17.70 0.20 0.40 0.03 4.08 40.00 0.35 R 0.07 292 274 2330 2460 2470 5470 5230 5770 0.89 0.31 4.76 10.01 18.40 0.45 17.70 0.19 0.40 0.04 3.97 39.90 0.35 R 0.06 283 275 2300 2460 2470 5400 5230 5754 0.90 0.31 4.78 10.01 18.35 0.45 17.70 0.19 0.42 0.04 4.00 39.70 0.34 R 0.07 278 278 2230 2480 2453 5320 5260 5701 0.91 0.32 4.76 9.96 18.32 0.45 17.70 0.19 0.40 0.04 4.01 39.70 0.35 S 0.06 287 283 2654 2575 5553 5563 0.88 0.33 4.72 10.33 0.55 18.34 0.45 6.72 17.42 0.22 0.41 0.02 2.05 39.51 0.34 S 0.07 289 283 2616 2477 5575 5533 0.92 0.34 4.60 10.13 0.54 17.89 0.44 6.54 17.12 0.21 0.39 0.05 2.00 39.90 0.34 S 0.06 289 284 2591 2516 5590 5593 0.91 0.34 4.61 10.29 0.54 17.76 0.44 6.75 17.26 0.21 0.41 0.05 2.03 39.07 0.34 S 0.06 287 280 2597 2494 5586 5506 0.89 0.33 4.70 10.27 0.55 18.12 0.45 6.58 17.46 0.22 0.41 0.05 2.02 40.09 0.34 S 0.06 281 284 2571 2531 5534 5590 0.89 0.34 4.66 10.29 0.55 18.02 0.44 6.57 17.28 0.22 0.40 0.06 1.96 39.29 0.34 S 0.06 285 279 2635 2561 5540 5518 0.90 0.34 4.56 10.01 0.54 17.95 0.45 6.62 17.01 0.21 0.39 0.04 1.98 39.74 0.33 S 0.06 288 281 2612 2560 5594 5514 0.88 0.34 4.64 10.22 0.54 17.89 0.44 6.68 17.22 0.22 0.40 0.05 1.99 39.46 0.34 S 0.07 293 287 2589 2578 5621 5601 0.92 0.35 4.63 10.14 0.54 18.05 0.44 6.76 17.16 0.22 0.40 0.04 2.12 39.55 0.34 T 0.06 280 280 2420 2360 5590 5590 3537 0.84 0.32 2.91 4.71 10.32 0.47 17.83 0.46 6.90 17.26 0.20 0.43 39.18 0.34 T 0.05 280 280 2410 2360 5570 5590 4758 0.89 0.35 2.91 4.75 10.41 0.48 17.85 0.47 7.10 17.21 0.20 0.43 38.84 0.34 T 0.06 280 280 2420 2360 5580 5550 4005 0.90 0.34 2.85 4.72 10.34 0.48 17.85 0.47 7.50 17.20 0.20 0.43 38.81 0.34 T 0.07 280 280 2430 2370 5630 5580 4294 0.90 0.34 2.88 4.75 10.42 0.48 17.77 0.47 7.10 17.40 0.20 0.43 38.55 0.34 T 0.05 280 280 2420 2390 5600 5620 4856 0.80 0.30 2.97 4.73 10.39 0.48 17.71 0.47 7.40 17.19 0.20 0.43 38.65 0.34 T 0.05 280 280 2420 2390 5630 5590 3559 0.89 0.33 2.97 4.72 10.36 0.48 17.72 0.47 7.20 17.18 0.20 0.43 39.23 0.35 T 0.06 280 280 2420 2370 5640 5580 4239 0.85 0.32 2.93 4.70 10.44 0.48 17.93 0.47 7.30 17.14 0.20 0.43 38.91 0.34 T 0.06 280 280 2400 2410 5590 5670 4344 0.84 0.32 2.92 4.75 10.40 0.48 17.70 0.47 7.40 17.39 0.20 0.43 38.61 0.34 U 276 284 2514 5682 4.65 10.53 18.50 0.45 6.95 16.98 0.22 0.43 0.04 39.48 0.34 U 234 288 2511 5605 4.66 10.58 18.50 0.47 6.96 17.08 0.22 0.43 0.04 39.47 0.35 U 281 284 2496 5640 4.69 10.50 18.29 0.46 7.10 16.90 0.22 0.42 0.04 39.29 0.37 U 286 285 2498 5692 4.69 10.60 18.54 0.47 6.88 17.07 0.22 0.43 0.04 39.59 0.36 U 273 286 2483 5574 4.68 10.55 18.49 0.45 6.83 17.05 0.22 0.43 0.04 39.52 0.36 U 284 284 2519 5677 4.66 10.56 18.58 0.47 6.98 17.08 0.22 0.43 0.04 39.44 0.34 U 302 287 2541 5629 4.70 10.50 18.35 0.47 7.06 17.00 0.22 0.42 0.04 39.47 0.36 U 285 282 2519 5665 4.66 10.48 18.37 0.48 6.97 16.96 0.22 0.42 0.04 39.33 0.35 V 304 2578 5700 0.85 0.33 4.39 10.39 0.47 18.35 0.49 6.72 17.53 0.21 0.49 4.94 39.13 0.36 V 292 2516 5540 0.85 0.32 4.46 10.50 0.47 18.64 0.51 6.63 17.72 0.21 0.49 4.97 37.90 0.37 V 284 2457 5750 0.85 0.31 4.38 10.38 0.47 18.43 0.46 6.59 17.53 0.21 0.47 4.99 38.97 0.36 V 295 2561 5700 0.85 0.31 4.30 10.17 0.46 17.60 0.46 6.77 17.20 0.20 0.47 4.97 41.04 0.35 V 310 2681 5780 0.86 0.31 4.36 10.29 0.47 17.90 0.48 7.11 17.40 0.21 0.47 4.86 39.80 0.36 V 316 2671 5890 0.85 0.31 4.33 10.24 0.46 18.07 0.48 6.24 17.31 0.20 0.47 4.88 40.67 0.36 V 288 2487 5320 0.86 0.34 4.40 10.41 0.47 18.03 0.47 6.05 17.59 0.21 0.48 4.87 39.70 0.36 V 286 2521 5470 0.85 0.32 4.43 10.47 0.48 18.04 0.47 6.08 17.69 0.21 0.47 4.89 39.67 0.36 W 0.06 277 239 287 2420 2430 2380 5330 5130 5060 0.80 0.31 3.05 4.48 10.27 0.47 18.45 0.42 7.41 16.91 0.20 0.41 0.04 3.71 39.09 W 0.06 287 240 281 2490 2370 2360 5220 5200 5030 0.87 0.33 3.11 4.67 10.32 0.47 18.41 0.44 7.41 17.02 0.20 0.40 0.04 3.79 39.38 W 0.06 286 243 280 2400 2410 2390 5270 5240 5080 0.86 0.33 3.03 4.62 10.23 0.47 18.28 0.42 7.40 16.87 0.20 0.43 0.04 3.73 38.87 W 0.07 283 244 284 2390 2400 2370 5220 5230 5050 0.81 0.32 3.10 4.63 10.18 0.47 18.30 0.42 7.34 16.72 0.20 0.39 0.04 4.11 38.84 W 0.07 285 241 285 2400 2390 2360 5230 5130 5020 0.92 0.35 3.12 4.61 10.24 0.47 18.35 0.43 7.30 16.90 0.20 0.39 0.04 3.85 38.78 W 0.08 265 246 285 2130 2450 2380 5110 5340 5070 0.92 0.36 3.07 4.59 10.17 0.47 18.25 0.41 7.32 16.82 0.21 0.40 0.04 3.43 38.66 W 0.06 273 243 275 2280 2490 2370 5280 5310 5040 0.93 0.37 3.15 4.65 10.19 0.47 18.39 0.43 7.37 16.94 0.20 0.39 0.04 3.39 38.48 W 0.06 268 244 286 2240 2440 2390 5152 5240 5110 0.88 0.36 3.10 4.60 10.38 0.48 18.50 0.43 7.36 17.08 0.20 0.39 0.04 3.46 39.21 Availability: This product is available in Laboratory Packs containing 1kg of material or in xplorer Packs containing client specified weights of material from 50g up to 250g. Laboratory Packs are sealed bottles delivered in sealed foil pouches. xplorer Packs contain material in standard geochem envelopes placed into foil pouches that are nitrogen flushed and vacuum sealed. 5

Legal notice: This certificate and the reference material described in it have been prepared with due care and attention. However AMS, Set Point Technology (Pty) Ltd, Mike McWha, Dr arry Smee and Smee and Associates Ltd; accept no liability for any decisions or actions taken following the use of the reference material. 11 August 2008 Certifying officers: African Mineral Standards: Mike McWha Sc (Hons), GSSA, MSAMM, Pr.Sci.Nat Geochemist: arry W. Smee Sc, PhD, P.Geo, (.C.) 6

Appendix Additional useful data collected during the round robin exercise includes these iterated but uncertified certified trace element statistics: lement Method Unit Mean 2SD RSD% n Ag M/CP ppm 0.90 0.27 14.8 63 Al M/CP % 2.66 0.30 5.7 94 As M/CP ppm 16.6 4.79 14.4 87 M/CP ppm 12.9 7.83 30.3 29 a M/CP ppm 89.6 5.17 2.9 82 i M/CP ppm 0.84 0.17 9.9 47 Ca M/CP % 7.26 0.64 4.4 99 Cd M/CP ppm 0.50 0.57 57.5 40 Ce M/CP ppm 13.1 0.87 3.3 47 Cr M/CP ppm 2151 424 9.8 89 Cs M/CP ppm 2.03 0.16 4.0 40 e M/CP % 12.6 1.08 4.3 101 Ga M/CP ppm 6.30 0.62 4.9 44 Hf M/CP ppm 1.15 0.10 4.2 32 n M/CP ppm 0.13 0.01 4.8 38 K M/CP % 0.40 0.05 5.8 107 La M/CP ppm 6.07 0.32 2.6 62 Li M/CP ppm 18.0 2.43 6.8 56 Mg M/CP % 9.87 0.85 4.3 93 Mn M/CP ppm 1536 131 4.3 94 Mo M/CP ppm 1.46 0.52 17.9 45 Na M/CP % 0.34 0.04 5.6 100 Nb M/CP ppm 1.97 1.22 31.0 39 P M/CP ppm 179 31.5 8.8 79 Pb M/CP ppm 15.4 8.92 29.0 74 Rb M/CP ppm 17.7 0.96 2.7 37 Sb M/CP ppm 21.9 3.77 8.6 74 Sc M/CP ppm 13.3 2.09 7.9 95 Se M/CP ppm 11.8 3.19 13.5 39 Sn M/CP ppm 2.65 0.70 13.3 46 Sr M/CP ppm 82.7 5.72 3.5 87 Ta M/CP ppm 0.35 0.32 46.0 39 Te M/CP ppm 2.29 0.52 11.3 40 Th M/CP ppm 1.72 0.17 5.0 47 Ti M/CP % 0.20 0.02 5.2 94 Tl M/CP ppm 0.21 0.05 12.7 36 U M/CP ppm 2.47 0.32 6.5 48 V M/CP ppm 83.7 9.13 5.5 77 W M/CP ppm 0.32 0.35 54.1 30 Y M/CP ppm 7.87 0.63 4.0 75 Zn M/CP ppm 115 29.0 12.6 101 Zr M/CP ppm 36.6 5.12 7.0 54 7