COAL CONCEPTS PROFICIENCY TESTING GENERAL ANALYSIS SAMPLE REPORT SEVENTY-FOUR. Final report

Transcription

1 Page 1 of 22 ` COAL CONCEPTS PROFICIENCY TESTING GENERAL ANALYSIS SAMPLE REPORT SEVENTY-FOUR Revision 00 Final report DATE ISSUED: 31 DECEMBER 2017 PARTICIPANT LABORATORY CODE: SCHEME COORDINATOR: K MUNSAMY CHECKED BY: R BABOOLAL (SCHEME MANAGER) SIGNATURE: SIGNATURE: Disclaimer: Opinions and interpretations expressed herein are outside the scope of SANAS accreditation *Moisture in the analysis sample is not included in the SANAS schedule of accreditation as robust statistics cannot be applied. Chlorine, Fluorine, Quick ash, ASTM ash and ASTM Volatiles is not included in the scope of accreditation. THINKING QUALITY, QUALITY THINKING REGISTRATION NUMBER: 2006/149731/23 (RMB INDUSTRIAL STATIONERS cc t/a) 81 CERAMIC CURVE, ALTON, RICHARDS BAY 3900 l TEL: +27(0) l CEL: +27(0) l FAX: ravi@coalconcepts.co.za

2 Page 2 of 22 EXECUTIVE SUMMARY 1. One hundred and eleven samples were sent to participants with 103 timeous result submissions 2. The total number of outliers found were as follows (dry base): ISO Volatile Matter x 6 CV x 5 Quick Ash x 1 ISO Ash x 6 Sulphur x 19 Phos x 2 Carbon x 2 AFT (Deformation) x2 AFT (Softening) x 3 3. Carbon, Hydrogen, Nitrogen, Chlorine, Fluorine, ASTM Ash & ASTM Volatile Matter participants were insufficient to warrant robust statistical calculations. The average result was used as the assigned value. 4. Trending for your laboratory is as follows:

3 Page 3 of 22 TABLE OF CONTENTS ITEM PAGE NUMBER Letter to participant 4 List of participants 5 Type of sample used 6 Preparation of sample 6 Homogeneity check 6 7 Stability check ISO Ash data 8 ISO Ash z-score trend 9 Quick Ash data & trend 10 ISO Volatile matter data 11 ISO Volatile matter z-score trend 12 Calorific value data 13 Calorific value z-score trend 14 Total sulphur data 15 Total sulphur z-score trend 16 Phosphorous data and Z-Score trend 17 Carbon data / Hydrogen data / Nitrogen data 18 AFT data and z-scores 19 ASTM Ash and ASTM Volatile matter, Chlorine & Fluorine 20 Conclusion 21 Terms & Conditions 22

4 Page 4 of 22 Dear Participant RE: PROFICIENCY TESTING RESULTS FOR THE MONTH OF DECEMBER 2017 Thank you for your participation in the Coal Concepts proficiency testing scheme. Your laboratory code is All results are totally confidential. Any results in Bold, Italics and Underlined are outliers. Where applicable, the most extreme outliers have been eliminated from calculations using the Grubbs estimate for outliers. Robust statistics has been applied where possible. Analysis results have been reported on air dry and dry base. The dry base results have been used to calculate the z-scores. Please take note of the following: 1. Z-scores between -1 and +1 is deemed acceptable 2. Z-scores between -2 and -3 should serve as a warning that the analysis result could get worse 3. Z-scores between +2 and +3 should also serve as a warning that analysis results could get worse. 4. Z- scores lower than -3 and exceeding +3 should warrant an investigation 5. Compare your result to the robust average which will be the assigned value. The measurement of uncertainty (UoM) of the results is also stated. 6. All calculations can be made available upon request The Coal Concepts scheme adheres to the requirements of ISO/IEC 17043:2010 Conformity assessment General requirements for proficiency testing. Statistical analysis has been carried out using ISO/IEC 13528:2015-Statistical methods for use in proficiency testing by interlaboratory comparisons Please find results attached together with Z-score trends. Best Regards R Baboolal

5 Page 5 of 22 LIST OF PARTICIPANTS IN ALPHABETICAL ORDER Arcelor Mittal - Vanderbijl Park Anglo SOC - Goedehoop Colliery South Plant Anglo SOC - New Vaal Colliery Anglo SOC - Landau Colliery Anglo SOC - Kriel Colliery Afrisam - Dudfield ALS - Eastside Alfred H Knight -Richards Bay Laboratory AquaSpecto Bureau Veritas Inspectorate Laboratories - Tendele Bureau Veritas Inspectorate Laboratories - Alton Bureau Veritas Inspectorate Laboratories - Middelburg Council for Geoscience CoalLab Pty Ltd Tselentis CoalLab Pty Ltd - Middelburg CoalLab Pty Ltd - Droogvallei Delmas Coal Eskom Holdings SOC Ltd Kendal Power station Eskom Holdings SOC Ltd Lethabo Power Station Eskom Holdings SOC Ltd - Tutuka Power Station Eskom Holdings SOC Ltd - ERID Eskom Holdings SOC Ltd - Hendrina Power Station Eskom Holdings SOC Ltd - Arnot Power Station Eskom Holdings SOC Ltd - Matla Power Station Eskom Holdings SOC Ltd Majuba Power Station Exxaro Resources - Grootegeluk Mine Glencore Boshoek Smelter Glencore Lion Smelter G&W Base & Industrial Minerals Intertek Mozambique OSS Laboratory Jindal Mining SA (Pty) Ltd - Kiepersol Colliery Lafarge Industries SA (Pty) Ltd - Lichtenburg Martech Marine surveyors - India Msobo Coal Pty Ltd M L Coal Mpumamanzi Noko Analytical Services CC - Witbank Richards Bay Minerals Siza Coal Services - Dundee Siza Coal Services - Botswana Siza Coal Services - Middelburg Siza Coal Services - Carolina South 32 Hotazel Manganese Mines South 32 Khutala Colliery Sibonisiwe Coal Laboratory Services CC SGS South Africa (Pty) Ltd Richards Bay Coal Terminal Laboratory SGS South Africa (Pty) Ltd - Trichardt Laboratory SGS South Africa (Pty) Ltd - Witbank Laboratory SGS South Africa (Pty) Ltd GGV Laboratory SGS South Africa (Pty) Ltd - Impunzi Laboratory SABS Commercial SOC Ltd Sudor SABS Commercial SOC Ltd CSIR SABS Commercial SOC Ltd Middelburg SABS Commercial SOC Ltd Uitkomst Umzamo Analytical Services - Overlooked Colliery Umzamo Analytical Services - Doornrug Vitrovian Analytical Services TEGETA Vitrovian Analytical Services Pullenshope Zululand Anthracite Colliery Arcelor Mittal - Newcastle Anglo SOC - Goedehoop Colliery North Plant Anglo SOC - Greenside Colliery Anglo SOC - Kleinkopje Colliery ALS - Witlab Afrisam - Ulco ALS -Muhanga ALS - Phalandwa Bureau Veritas - Nacala Bureau Veritas Inspectorate Laboratories - Beira Bureau Veritas Testing & Inspection SA - Pretoria CoalLab Pty Ltd - AMR CoalLab Pty Ltd - Phola CoalLab Pty Ltd - Kangala CoalLab Pty Ltd - Umlabu CoalLab Pty Ltd - VDD Eskom Holdings SOC Ltd - Duvha Power Station Eskom Holdings SOC Ltd - Komati Power Station Eskom Holdings SOC Ltd - Grootvlei Power Station Eskom Holdings SOC Ltd - Kriel Power Station Eskom Holdings SOC Ltd - Matimba Power Station Exxaro Resources - Matla Mine Eyethu Coal Eskom Holdings SOC Ltd Medupi Power Station Glencore -Rustenburg Smelter Glencore -Lydenburg Smelter GLI Laboratuvar Sube Mudurlugu Komur Deney Laboratuvari - Turkey Glencore Wonderkop Intertek Mozambique Kangra Coal (Pty) Ltd Mafube Colliery Mine pty (ltd) Makomo Resources Mitra SK South Africa (Pty) Ltd Morupule Coal Mine - Botswana Noko Analytical Services CC - Twistdraai Noko Analytical Services CC - Hakahno Ronewa Lab Siza Coal Services - Vlakfontein Siza Coal Services - Kinross Siza Coal Services - NCC Siza Londani Lab SABS Commercial SOC Ltd Springlake Sibonisiwe Coal Laboratory Services CC - West Coal Processing Sibonisiwe Coal Laboratory Services CC Rirhandzu Lab SGS South Africa (Pty) Ltd - Leeuwpan Laboratory SGS South Africa (Pty) Ltd Richards Bay Port Laboratory SGS South Africa (Pty) Ltd - Middelburg Laboratory SGS South Africa (Pty) Ltd - Wondefontein Laboratory SGS Tweefontein SABS Commercial SOC Ltd Mimosa SABS Commercial SOC Ltd Secunda SABS Commercial SOC Ltd Richards bay Times Marine Services -India Umzamo Analytical Services - Witbank Vitrovian Analytical Services DELMAS Vitrovian Analytical Services Umlalazi Vitrovian Analytical Services Koornfontein Vinca Institute for Nuclear Sciences - Serbia

6 Page 6 of TYPE OF SAMPLE USED The coal used in this proficiency testing round was anthracitic coal from a mine in Kwa Zulu Natal 2. PREPARATION OF SAMPLE Approximately 800kg s of sample with an approximate topsize of 50mm was sourced. This was crushed to -4mm using a jaw crusher. The -4mm material was reduced to -212um using a cross beat pulveriser. The 212 material was sieved using a 212um screen. Any +212um material was pulverised and sieved until all material passed through the 212 um sieve. All the -212um material was then mixed in a 500 litre mixing drum for 4 hours. 3. HOMOGENEITY CHECK There were 108 participants in this round, 20 portions of sample were randomly extracted from the 800kg sample. These were packaged in their final form i.e. in 200ml sample bottles. The bottles were labelled 1 to 20. The results were as follows: SAMPLE NO. TEST PORTION 1 TEST PORTION 2 sample av (Xt) range (Wt) range sqd 1 24,33 24,5 24,42 0,17 0, ,36 24,47 24,42 0,11 0, ,48 24,46 24,47 0,02 0, ,43 24,44 24,44 0,01 0, ,37 24,61 24,49 0,24 0, ,42 24,47 24,45 0,05 0, ,55 24,42 24,49 0,13 0, ,45 24,64 24,55 0,19 0, ,47 24,49 24,48 0,02 0, ,5 24,44 24,47 0,06 0, ,32 24,43 24,38 0,11 0, ,37 24,58 24,48 0,21 0, ,47 24,52 24,50 0,05 0, ,37 24,53 24,45 0,16 0, ,45 24,44 24,45 0,01 0, ,53 24,54 24,54 0,01 0, ,44 24,54 24,49 0,10 0, ,51 24,62 24,57 0,11 0, ,42 24,45 24,44 0,03 0, ,36 24,51 24,44 0,15 0,023 GENERAL AVERAGE 24,47 STANDARD DEVIATION 0,046 WITHIN SAMPLE STANDARD DEVIATION 0,085 BETWEEN SAMPLE STANDARD DEVIATION 0,038 The between sample standard deviation must be 0.3 x ơ (ơ = std deviation for the proficiency assessment) Ơ = 2% of the mean was used, which is the repeatability for ISO ash (Ash % > 10%) Hence 0.3 x 0.489= Since < the samples are homogenous

7 Page 7 of STABILITY CHECK Samples were retained for sales as reference material. Ten of them were randomly chosen for stability testing. In order for the proficiency testing samples to be declared stable the general average from the homogeneity check and that of the stability check the difference in the general average should not differ by more than 0.3 X precision This test has been carried out about a month after the samples were received by the participating laboratories SAMPLE NO. TEST PORTION 1 TEST PORTION 2 sample av (Xt) range (Wt) range sqd 1 24,43 24,44 24,44 0,01 0, ,41 24,46 24,44 0,05 0, ,61 24,43 24,52 0,18 0, ,44 24,38 24,41 0,06 0, ,51 24,45 24,48 0,06 0, ,53 24,44 24,49 0,09 0, ,5 24,41 24,46 0,09 0, ,61 24,47 24,54 0,14 0, ,67 24,32 24,50 0,35 0, ,52 24,36 24,44 0,16 0, ,58 24,52 24,55 0,06 0, ,53 24,45 24,49 0,08 0, ,45 24,43 24,44 0,02 0, ,39 24,45 24,42 0,06 0, ,49 24,49 24,49 0,00 0, ,54 24,43 24,49 0,11 0, ,56 24,40 24,48 0,16 0, ,51 24,62 24,57 0,11 0, ,31 24,45 24,38 0,14 0, ,42 24,32 24,37 0,10 0,010 GENERAL AVERAGE 24,47 STANDARD DEVIATION 0,053 WITHIN SAMPLE STANDARD DEVIATION 0,089 BETWEEN SAMPLE STANDARD DEVIATION 0,034 (Ơ = was used) For this report 0.3 x 0.489= Absolute value of ( ) = 0 0 < therefore the proficiency testing samples were stable

8 Page 8 of 22 ANALYTICAL PARAMETER : ISO ASH (%) MOISTURE IN ANALYSIS LAB ID SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE) 1a 3,87 24,57 25,56 2,02 6a 3,22 24,69 25,51 1,73 7a 3,03 24,87 25,65 2,56 9a 3,23 24,33 25,14-0,53 10a 3,20 24,40 25,21-0,14 12a 3,80 24,30 25,26 0,19 15a 3,28 24,23 25,05-1,08 18a 3,66 24,34 25,26 0,22 20a 3,50 24,45 25,34 0,66 21a 3,03 24,25 25,01-1,35 23a 3,15 25,18 26,00 4,72 24a 3,11 24,60 25,39 0,99 26a 3,44 24,59 25,47 1,45 27a 3,00 24,30 25,05-1,09 28a 2,60 24,30 24,95-1,72 30a 3,49 24,31 25,19-0,24 32a 2,90 24,30 25,03-1,24 33a 3,40 24,35 25,21-0,13 35a 3,34 24,40 25,24 0,09 36a 3,50 24,40 25,28 0,34 38a 3,13 24,40 25,19-0,25 40a 3,70 24,40 25,34 0,67 42a 3,14 24,41 25,20-0,17 43a 3,30 24,70 25,54 1,92 44a 3,23 24,33 25,14-0,53 49a 3,38 24,45 25,31 0,47 58a 2,98 24,34 25,09-0,86 59a 2,80 15,09 15,52-59,43 60a 3,48 24,24 25,11-0,70 61a 3,10 24,40 25,18-0,29 66a 3,27 24,39 25,21-0,09 69a 3,35 24,48 25,33 0,61 72a 2,30 24,30 24,87-2,18 74a 3,04 24,33 25,09-0,83 76a 3,20 24,48 25,29 0,37 79a 3,67 24,21 25,13-0,59 80a 2,90 24,43 25,16-0,42 82a 3,40 21,56 22,32-17,82 83a 3,16 24,63 25,43 1,26 88a 3,58 24,25 25,15-0,48 91a 4,20 24,10 25,16-0,44 95a 3,38 24,28 25,13-0,61 96a 2,97 24,73 25,49 1,58 97a 2,77 24,44 25,14-0,57 98a 3,25 16,11 16,65-52,53 99a 3,10 24,50 25,28 0,34 100a 3,55 24,42 25,32 0,55 101a 4,02 24,27 25,29 0,35 105a 3,30 24,40 25,23 0,0 106a 2,79 24,55 25,25 0,16 107a 1,30 24,60 24,92-1,87 108a 3,47 24,39 25,27 0,23 109a 3,40 24,40 25,26 0,18 110a 3,15 24,41 25,20-0,15 112a 2,40 24,40 25,00-1,40 117a 2,70 24,35 25,03-1,24 124a 3,69 24,47 25,41 1,09 126a 3,05 25,18 25,97 4,55 128a 3,28 24,43 25,26 0,18 129a 3,18 24,63 25,44 1,29 131a 3,56 24,28 25,18-0,32 132a 3,18 24,39 25,19-0,23 135a 3,34 24,37 25,21-0,10 136a 3,22 24,34 25,15-0,48 137a 3,46 24,29 25,16-0,42 139a 3,01 24,35 25,11-0,75 143a 2,76 24,40 25,09-0,83 145a 3,12 24,40 25,19-0,26 144a 3,10 24,90 25,70 2,87 146a 3,20 16,30 16,84-51,38 151a 3,68 24,35 25,28 0,32 155a 3,22 24,40 25,21-0,10 Number of results OUTLIERS AVERAGE - 3,21 24,40 25,23 - STD DEVIATION - - 0,12 0,16 - ROBUST AVERAGE ,40 25,23 - ROBUST STD DEVIATION - - 0,13 0,17 - UoM 0,02 0,03

9 Z-SCORE Page 9 of 22 3,00 ISO ASH Z-SCORE TREND 2,00 1,00 0,00-1,00-2,00-3,00 LABORATORY ID

10 Z-SCORE ANALYTICAL PARAMETER : QUICK ASH (%) LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE) 21a 3,03 24,78 25,55 1,55 22a 2,99 24,14 24,88-2,15 23a 3,15 25,33 26,15 4,86 37a 3,55 24,53 25,43 0,88 39a 3,58 24,58 25,49 1,21 40a 3,70 24,10 25,03-1,37 41a 3,20 24,40 25,21-0,37 49a 3,38 24,61 25,47 1,09 50a 3,14 24,74 25,54 1,48 64a 3,37 24,23 25,08-1,10 63a 3,28 24,50 25,33 0,32 73a 3,39 24,13 24,98-1,64 74a 3,04 24,43 25,20-0,43 77a 3,70 24,50 25,44 0,93 84a 3,25 24,44 25,26-0,07 94a 3,60 24,33 25,24-0,19 100a 3,55 24,54 25,44 0,94 101a 4,02 24,20 25,21-0,33 102a 2,75 24,70 25,40 0,69 105a 3,30 24,50 25,34 0,34 113a 3,27 24,33 25,15-0,7 119a 2,65 24,18 24,84-2,41 120a 2,80 24,65 25,36 0,48 122a 3,40 24,40 25,26-0,08 126a 3,05 24,57 25,34 0,38 130a 3,10 24,30 25,08-1,08 131a 3,56 24,30 25,20-0,4 132a 3,18 24,56 25,37 0,51 133a 3,23 24,35 25,16-0,61 136a 3,22 24,50 25,32 0,23 137a 3,46 24,30 25,17-0,57 138a 3,20 24,49 25,30 0,14 140a 3,79 24,43 25,39 0,66 143a 2,76 24,52 25,22-0,32 144a 3,10 24,43 25,21-0,34 147a 3,07 24,50 25,28 0,01 149a 2,80 24,50 25,21-0,38 153a 3,25 24,30 25,12-0,87 160a 3,25 24,20 25,01-1,44 161a 3,50 24,70 25,60 1,78 163a 3,50 24,60 25,49 1,21 164a 3,25 24,70 25,53 1,41 165a 3,25 24,56 25,39 0,62 Number of results OUTLIERS AVERAGE - 3,28 24,45 25,27 - STD DEVIATION - - 0,18 0,18 - ROBUST AVERAGE ,45 25,28 - ROBUST STD DEVIATION - - 0,19 0,20 - UoM 0,04 0,04 Page 10 of 22 3,00 QUICK ASH Z-SCORE TREND 2,00 1,00 0,00-1,00-2,00-3,00 LABORATORY ID

11 ANALYTICAL PARAMETER : ISO VOLATILE MATTER (%) MOISTURE IN ANALYSIS LAB ID SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 16,46 17,12-0,35 6a 3,22 16,64 17,19-0,13 7a 3,03 13,90 14,33-9,19 9a 3,23 16,98 17,55 0,99 10a 3,20 17,00 17,56 1,04 12a 3,80 16,10 16,74-1,58 15a 3,28 16,71 17,28 0,13 18a 3,66 16,58 17,21-0,08 20a 3,50 17,08 17,70 1,47 21a 3,03 17,06 17,59 1,14 22a 2,99 16,79 17,31 0,23 23a 3,15 14,20 14,66-8,14 24a 3,11 16,43 16,96-0,88 26a 3,44 19,67 20,37 9,92 27a 3,00 16,70 17,22-0,06 28a 2,60 16,70 17,15-0,28 30a 3,49 16,26 16,85-1,22 32a 2,90 17,10 17,61 1,19 33a 3,40 16,28 16,85-1,21 35a 3,34 16,61 17,18-0,16 36a 3,50 16,70 17,31 0,23 37a 3,55 16,18 16,78-1,45 38a 3,13 16,70 17,24 0,02 39a 3,58 16,13 16,73-1,60 40a 3,70 16,50 17,13-0,32 41a 3,20 16,80 17,36 0,38 42a 3,14 16,89 17,44 0,64 43a 3,30 16,30 16,86-1,20 44a 3,23 16,85 17,41 0,56 49a 3,38 16,46 17,04-0,63 50a 3,14 16,50 17,03-0,63 58a 2,98 16,93 17,45 0,68 59a 2,80 17,43 17,93 2,21 60a 3,48 16,86 17,47 0,74 61a 3,10 16,80 17,34 0,33 63a 3,28 16,75 17,31 0,25 69a 3,35 16,48 17,05-0,58 66a 3,27 16,70 17,26 0,08 72a 2,30 14,59 14,93-7,28 73a 3,39 16,70 17,29 0,16 74a 3,04 16,93 17,46 0,72 76a 3,20 16,10 16,63-1,90 77a 3,70 16,40 17,03-0,65 79a 3,67 16,30 16,92-0,99 80a 2,90 16,30 16,79-1,41 82a 3,40 16,94 17,54 0,96 83a 3,16 16,83 17,38 0,46 88a 3,58 16,95 17,58 1,09 91a 4,20 16,20 16,91-1,02 94a 3,60 16,75 17,38 0,45 95a 3,38 16,78 17,37 0,42 96a 2,97 16,82 17,33 0,32 97a 2,77 17,01 17,49 0,82 98a 3,25 21,79 22,52 16,73 99a 3,10 16,80 17,34 0,33 100a 3,55 16,25 16,85-1,22 101a 4,02 16,57 17,26 0,09 102a 2,75 17,40 17,89 2,08 105a 3,30 17,30 17,89 2,08 106a 2,79 16,61 17,09-0,47 108a 3,47 16,00 16,58-2,08 109a 3,40 16,50 17,08-0,48 110a 3,15 16,83 17,38 0,45 112a 2,40 17,40 17,83 1,88 113a 3,27 16,29 16,84-1,24 117a 2,70 16,85 17,32 0,26 119a 2,65 17,30 17,77 1,70 120a 2,80 17,05 17,54 0,97 122a 3,40 16,60 17,18-0,16 124a 3,69 16,09 16,71-1,67 126a 3,05 16,96 17,49 0,82 128a 3,28 16,39 16,95-0,91 129a 3,18 16,35 16,89-1,10 130a 3,10 16,70 17,23 0,00 131a 3,56 16,67 17,29 0,16 132a 3,18 16,32 16,86-1,20 133a 3,23 16,33 16,87-1,15 135a 3,34 16,85 17,43 0,63 136a 3,22 16,64 17,19-0,13 137a 3,46 16,33 16,92-1,01 138a 3,20 16,94 17,50 0,83 139a 3,01 16,35 16,86-1,19 140a 3,79 16,65 17,31 0,23 143a 2,76 16,59 17,06-0,55 145a 3,12 16,90 17,44 0,67 144a 3,10 17,13 17,67 1,39 146a 3,20 24,60 25,41 25,87 147a 3,07 17,18 17,72 1,55 151a 3,68 16,46 17,09-0,46 155a 3,22 16,25 16,79-1,40 161a 3,50 16,90 17,51 0,88 NUMBER OF RESULTS OUTLIERS AVERAGE - 3,25 16,67 17,23 - STD DEVIATION - 0,33 0,32 - ROBUST AVERAGE ,67 17,23 - ROBUST STD DEVIATION - - 0,37 0,35 - UoM - - 0,05 0,05 - Page 11 of 22

12 Page 12 of 22-3,00-2,00-1,00 0,00 1,00 2,00 3,00 108a 76a 124a 39a 12a 37a 80a 155a 113a 30a 100a 33a 132a 43a 139a 133a 129a 91a 137a 79a 128a 24a 77a 50a 49a 69a 143a 109a 106a 151a 1a 40a 28a 35a 122a 6a 136a 18a 27a 130a 38a 66a 101a 15a 131a 73a 36a 140a 22a 63a 117a 96a 61a 99a 41a 95a 94a 110a 83a 44a 135a 42a 145a 58a 74a 60a 126a 97a 138a 161a 82a 120a 9a 10a 88a 21a 32a 144a 20a 147a 119a 112a 105a 102a 59a Z-SCORE LABORATORY ID VOLATILE MATTER Z-SCORE TREND

13 Page 13 of 22 ANALYTICAL PARAMETER : CALORIFIC VALUE (MJ/kg) LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (MJ/kg) DRY BASE (MJ/kg) Z-SCORE (DRY BASE) 1a 3,87 23,54 24,49 0,42 6a 3,22 24,46 25,27 3,97 9a 3,23 23,50 24,28-0,51 10a 3,20 23,53 24,31-0,39 12a 3,80 23,42 24,35-0,22 18a 3,66 23,53 24,42 0,13 20a 3,50 23,78 24,64 1,12 21a 3,03 23,62 24,36-0,16 23a 3,15 23,70 24,47 0,33 24a 3,11 26,14 26,98 11,67 27a 3,00 23,26 23,98-1,87 28a 2,60 23,60 24,23-0,74 30a 3,49 23,46 24,31-0,39 32a 2,90 23,71 24,42 0,11 33a 3,40 23,71 24,54 0,68 35a 3,34 23,52 24,33-0,28 36a 3,50 23,45 24,30-0,42 37a 3,55 23,46 24,32-0,32 38a 3,13 23,74 24,50 0,50 39a 3,58 23,69 24,57 0,79 40a 3,70 23,46 24,36-0,1 42a 3,14 24,00 24,78 1,73 43a 3,30 23,50 24,30-0,42 44a 3,23 23,60 24,39 0,0 49a 3,38 23,62 24,45 0,24 50a 3,14 23,55 24,31-0,36 58a 2,98 23,45 24,17-1,01 59a 2,80 23,50 24,18-0,98 61a 3,10 23,58 24,33-0,27 63a 3,28 23,67 24,47 0,36 64a 3,37 22,17 22,94-6,55 66a 3,27 23,55 24,34-0,22 72a 2,30 23,02 23,56-3,76 73a 3,39 23,61 24,44 0,20 74a 3,04 24,08 24,83 1,99 76a 3,20 24,00 24,79 1,80 77a 3,70 23,51 24,41 0,09 79a 3,67 23,62 24,52 0,57 80a 2,90 23,99 24,71 1,41 82a 3,40 23,91 24,75 1,59 83a 3,16 23,72 24,49 0,45 84a 3,25 23,93 24,73 1,53 88a 3,58 23,71 24,59 0,86 91a 4,20 23,60 24,63 1,09 94a 3,60 23,21 24,07-1,45 95a 3,38 23,60 24,43 0,14 96a 2,97 23,93 24,66 1,21 97a 2,77 23,81 24,49 0,43 98a 3,25 26,46 27,35 13,34 99a 3,10 23,42 24,17-1,01 100a 3,55 23,68 24,55 0,71 101a 4,02 23,62 24,61 0,97 102a 2,75 23,10 23,75-2,89 105a 3,30 23,34 24,14-1,16 106a 2,79 23,72 24,40 0,03 108a 3,47 23,64 24,49 0,43 109a 3,40 23,70 24,53 0,63 110a 3,15 23,94 24,72 1,46 112a 2,40 24,36 24,96 2,55 117a 2,70 23,66 24,32-0,35 119a 2,65 23,76 24,41 0,06 120a 2,80 23,15 23,82-2,61 122a 3,40 23,59 24,42 0,12 124a 3,69 23,68 24,59 0,87 126a 3,05 23,47 24,21-0,84 128a 3,28 23,55 24,35-0,21 129a 3,18 23,68 24,46 0,29 130a 3,10 23,30 24,05-1,6 131a 3,56 23,57 24,44 0,21 132a 3,18 23,36 24,13-1,20 133a 3,23 23,37 24,14-1,12 135a 3,34 23,58 24,39 0,00 136a 3,22 23,66 24,45 0,24 137a 3,46 23,30 24,14-1,17 140a 3,79 23,83 24,77 1,69 143a 2,76 23,51 24,18-0,98 145a 3,12 23,47 24,23-0,76 147a 3,07 23,66 24,41 0,07 149a 2,80 23,53 24,21-0,84 151a 3,68 23,47 24,37-0,12 153a 3,25 23,28 24,06-1,50 160a 3,25 23,49 24,28-0,52 161a 3,50 23,49 24,34-0,24 164a 3,25 23,36 24,14-1,13 165a 3,25 23,74 24,54 0,65 163a 3,50 23,47 24,32-0,33 NUMBER OF RESULTS OUTLIERS AVERAGE - 3,25 23,58 24,39 - STD DEVIATION - - 0,20 0,22 - ROBUST AVERAGE ,58 24,40 - ROBUST STD DEVIATION - - 0,22 0,24 - UoM - - 0,03 0,03 -

14 Page 14 of 22-3,00-2,00-1,00 0,00 1,00 2,00 3,00 102a 120a 27a 130a 153a 94a 132a 137a 105a 164a 133a 99a 58a 59a 143a 149a 126a 145a 28a 160a 9a 36a 43a 10a 30a 50a 117a 163a 37a 35a 61a 161a 66a 12a 128a 21a 40a 151a 44a 135a 106a 119a 147a 77a 32a 122a 18a 95a 73a 131a 49a 136a 129a 23a 63a 1a 97a 108a 83a 38a 79a 109a 165a 33a 100a 39a 88a 124a 101a 91a 20a 96a 80a 110a 84a 82a 140a 42a 76a 74a Z-SCORE LABORATORY ID CALORIFIC VALUE Z-SCORE TREND

15 Page 15 of 22 ANALYTICAL PARAMETER : TOTAL SULPHUR (%) MOISTURE IN ANALYSIS LAB ID SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 0,94 0,98 0,0 6a 3,22 1,00 1,03 1,30 7a 3,03 0,42 0,43-13,10 9a 3,23 0,92 0,95-0,68 10a 3,20 0,91 0,94-0,93 12a 3,80 0,95 0,99 0,21 15a 3,28 0,92 0,95-0,67 18a 3,66 0,86 0,89-2,07 20a 3,50 0,98 1,02 0,88 21a 3,03 0,97 1,00 0,51 23a 3,15 0,97 1,00 0,54 24a 3,11 0,96 0,99 0,28 26a 3,44 0,97 1,00 0,61 27a 3,00 0,99 1,02 1,00 28a 2,60 0,91 0,93-1,07 30a 3,49 0,98 1,02 0,90 32a 2,90 0,95 0,98 0,0 35a 3,34 0,96 0,99 0,34 36a 3,50 0,90 0,93-1,11 37a 3,55 0,96 1,00 0,39 38a 3,13 0,95 0,98 0,0 39a 3,58 0,91 0,94-0,84 40a 3,70 0,90 0,93-1,06 42a 3,14 0,91 0,94-0,95 43a 3,30 0,92 0,95-0,66 44a 3,23 0,97 1,00 0,56 49a 3,38 0,93 0,96-0,39 50a 3,14 0,89 0,92-1,44 58a 2,98 0,94 0,97-0,24 59a 2,80 0,97 1,00 0,46 60a 3,48 0,95 0,98 0,00 61a 3,10 1,01 1,04 1,52 69a 3,35 0,91 0,94-0,92 72a 2,30 0,92 0,94-0,90 74a 3,04 0,91 0,94-0,97 76a 3,20 0,96 0,99 0,31 79a 3,67 0,74 0,77-5,06 80a 2,90 0,95 0,98 0,0 83a 3,16 0,93 0,96-0,45 88a 3,58 1,00 1,04 1,40 91a 4,20 0,91 0,95-0,70 95a 3,38 0,95 0,98 0,00 97a 2,77 0,97 1,00 0,45 99a 3,10 0,94 0,97-0,21 101a 4,02 1,16 1,21 5,51 106a 2,79 1,03 1,06 1,93 107a 1,30 0,96 0,97-0,15 108a 3,47 0,97 1,00 0,62 109a 3,40 0,96 0,99 0,36 110a 3,15 0,92 0,95-0,70 112a 2,40 0,98 1,00 0,60 113a 3,27 1,01 1,04 1,56 119a 2,65 1,14 1,17 4,61 122a 3,40 0,92 0,95-0,64 124a 3,69 1,00 1,04 1,42 126a 3,05 0,67 0,69-6,91 128a 3,28 1,12 1,16 4,30 130a 3,10 0,89 0,92-1,45 131a 3,56 0,69 0,72-6,32 132a 3,18 0,60 0,62-8,62 133a 3,23 0,96 0,99 0,31 135a 3,34 1,07 1,11 3,07 136a 3,22 0,88 0,91-1,67 137a 3,46 0,61 0,63-8,33 138a 3,20 1,01 1,04 1,55 139a 3,01 0,97 1,00 0,46 140a 3,79 0,95 0,99 0,20 143a 2,76 0,94 0,97-0,29 144a 3,10 0,89 0,92-1,45 145a 3,12 0,96 0,99 0,29 146a 3,20 0,97 1,00 0,46 161a 3,50 0,86 0,89-2,11 NUMBER OF RESULTS OUTLIERS AVERAGE - 3,23 0,95 0,98 - MEDIAN - 0,95 0,98 STD DEVIATION - - 0,04 0,04 - ROBUST AVERAGE - - 0,95 0,98 - ROBUST STD DEVIATION - - 0,04 0,04 - UoM - - 0,01 0,01

16 Page 16 of 22-3,00-2,00-1,00 0,00 1,00 2,00 3,00 161a 18a 136a 130a 144a 50a 36a 28a 40a 74a 42a 10a 69a 72a 39a 91a 110a 9a 15a 43a 122a 83a 49a 143a 58a 99a 107a 1a 32a 80a 60a 95a 38a 140a 12a 24a 145a 76a 133a 35a 109a 37a 97a 146a 59a 139a 21a 23a 44a 112a 26a 108a 20a 30a 27a 6a 88a 124a 61a 138a 113a 106a 135a Z-SCORE LABORATORY ID TOTAL SULPHUR Z-SCORE TREND

17 Z-SCORES ANALYTICAL PARAMETER : PHOSPHOROUS IN COAL (%) LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 0,056 0,058 0,64 7a 3,03 0,065 0,067 1,53 9a 3,23 0,048 0,050 0,0 12a 3,80 0,052 0,054 0,21 15a 3,28 0,038 0,039-1,31 18a 3,66 0,044 0,046-0,65 21a 3,03 0,096 0,099 4,81 23a 3,15 0,044 0,045-0,68 26a 3,44 0,048 0,049-0,29 40a 3,70 0,045 0,047-0,54 59a 2,80 0,116 0,119 6,89 69a 3,35 0,045 0,047-0,56 74a 3,04 0,059 0,061 0,90 107a 1,30 0,039 0,040-1,28 108a 3,47 0,060 0,062 1,03 109a 3,40 0,059 0,061 0,92 112a 2,40 0,062 0,064 1,17 113a 3,27 0,054 0,056 0,39 114a 1,30 0,054 0,055 0,27 138a 3,20 0,064 0,066 1,44 139a 3,01 0,032 0,033-1,95 146a 3,20 0,041 0,042-0,99 Number of results OUTLIERS AVERAGE - 3,09 0,050 0,052 - STD DEVIATION - - 0,009 0,010 - MEDIAN - 0,050 0,052 ROBUST AVERAGE - - 0,051 0,052 ROBUST STD DEVIATION - - 0,011 0,011 UoM - - 0,003 0,003 Page 17 of 22 3,00 PHOSPHOROUS IN COAL Z-SCORES 2,00 1,00 0,00 139a 15a 107a 146a 23a 18a 69a 40a 26a 9a 12a 114a 113a 1a 74a 109a 108a 112a 138a 7a 21a 59a -1,00-2,00-3,00 LAB ID

18 Page 18 of 22 ANALYTICAL PARAMETER : TOTAL CARBON (%) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 60,86 63,31-0,75 9a** 3,23 50,35 52,03-16,29 12a** 3,80 62,74 65,22 1,88 18a 3,66 61,25 63,58-0,38 21a 3,03 62,24 64,18 0,46 40a 3,70 61,40 63,76-0,13 43a** 3,30 66,00 68,25 6,06 49a 3,38 62,30 64,48 0,86 99a 3,10 61,80 63,78-0,10 108a 3,47 60,83 63,02-1,15 109a 3,40 60,70 62,84-1,40 145a 3,12 62,35 64,36 0,70 Number of results OUTLIERS AVERAGE - 3,43 61,65 63,85 - MEDIAN ,60 63,77 - STD DEVIATION - - 0,74 0,73 - REPRODUCIBILITY UPPER LIMIT ,85 - LOWER LIMIT ,85 - ANALYTICAL PARAMETER : HYDROGEN (%) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 2,60 2,70-1,51 9a 3,23 2,91 3,01 0,60 12a 3,80 2,90 3,01 0,65 18a 3,66 2,69 2,79-0,90 21a 3,03 2,78 2,87-0,38 43a 3,30 2,96 3,06 0,97 99a 3,10 3,04 3,14 1,50 108a 3,47 2,81 2,91-0,06 109a 3,40 2,70 2,80-0,88 Number of results OUTLIERS AVERAGE - 3,43 2,82 2,92 - MEDIAN - 2,81 2,91 - STD DEVIATION - - 0,14 0,14 - REPRODUCIBILITY UPPER LIMIT ,17 - LOWER LIMIT ,67 - ANALYTICAL PARAMETER : NITROGEN(%) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3,87 1,28 1,33 0,37 9a 3,23 1,25 1,29-0,69 12a 3,80 1,21 1,26-1,59 18a 3,66 1,25 1,30-0,53 43a** 3,30 1,50 1,55 6,22 99a 3,10 1,32 1,36 1,19 108a 3,47 1,31 1,36 1,05 109a 3,40 1,28 1,33 0,20 Number of results OUTLIERS AVERAGE - 3,46 1,27 1,32 - MEDIAN - 1,28 1,33 - STD DEVIATION - - 0,04 0,04 - REPRODUCIBILITY UPPER LIMIT ,47 - LOWER LIMIT ,17 -

19 Page 19 of 22 ANALYTICAL PARAMETER : ASH FUSION TEMPERATURES (oc) LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW 1a a a a a a a a a a a** a a a a a a Number of results Outliers AVERAGE MEDIAN STDEV REPRODUCIBILITY UPPER LIMIT LOWER LIMIT Z-SCORES LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW 1a -0,21 0,39 0,00 0,00 9a 1,04 0,39 0,00 0,00 10a -1,89-27,14 0,00 0,00 18a 1,04 0,39 0,00 0,00 21a -0,72 0,39 0,00 0,00 23a -5,56 0,39 0,00 0,00 40a 1,04 0,39 0,00 0,00 42a -0,43 0,39 0,00 0,00 49a 1,04 0,39 0,00 0,00 60a -1,38-2,36 0,00 0,00 80a -7,77-95,99 0,00 0,00 95a -0,79-32,65-3,00 0,00 99a -0,72-2,36 0,00 0,00 108a 1,04 0,39 0,00 0,00 109a 0,16 0,39 0,00 0,00 110a -0,28 0,39 0,00 0,00 131a 1,04 0,39 0,00 0,00

20 Page 20 of 22 ANALYTICAL PARAMETER : ASTM ASH (%) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE) 1a 3,87 24,47 25,46 1,13 108a 3,47 24,50 25,38-0,38 109a 3,40 24,50 25,36-0,75 Number of results OUTLIERS AVERAGE - 3,58 24,49 25,40 - STD DEVIATION - - 0,02 0,05 - MEDIAN ,50 25,38 - ANALYTICAL PARAMETER : ASTM VOLS (%) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE) 1a 3,87 16,91 17,59-1,15 108a 3,47 17,17 17,79 0,50 109a 3,40 17,20 17,81 0,65 Number of results OUTLIERS AVERAGE - 3,58 17,19 17,73 - STD DEVIATION - - 0,02 0,12 - MEDIAN ,19 17,79 - ANALYTICAL PARAMETER : CHLORINE (ppm) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 12a 3, ,13 108a 3, ,36 109a 3, ,77 Number of results OUTLIERS AVERAGE - 3, STD DEVIATION MEDIAN ANALYTICAL PARAMETER : FLUORINE (ppm) MOISTURE IN LAB ID ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE) 1a 3, ,76 12a 3, ,41 108a 3, ,47 109a 3, ,30 Number of results OUTLIERS AVERAGE - 3, STD DEVIATION MEDIAN

21 Page 21 of 22 CONCLUSION 1. The overall ISO Ash determination trend indicated an almost even z-score trend. Six outliers were detected, which seemed to be due to analytical errors and swopped samples 2. The overall ISO volatile determination trend indicated an almost even z-score trend. Six outliers were detected, which seemed to be due to analytical errors and swopped samples. 3. Calorific value trend was evenly distributed. Five outliers were detected. 4. Sulphur determination had nine outliers. These could be due to calibration problems or swopped samples 5. Phosphorous trending positively distributed. The mean, median and robust average compared well indicating that extreme results did not affect the centralised value. Two outliers were detected. 6. Two extreme outliers were detected for Carbon analysis, most probably due to poor calibration. Hydrogen and Nitrogen were well done 7. AFT was generally well done. Outliers were detected at the various stages. Laboratories that had outliers should look check staff training. 8. Assessment criterion for homogeneity check (From ISO 13528, page 45) 8.1 Comparison of the between sample standard deviation with the standard deviation for proficiency testing Standard deviation for ISO ash =0.12 Check value = 0.12 x 0.3 = Between sample standard deviation = The between standard deviation is greater than the check value for the criterion assessment for homogeneity, therefore the following assessment will be used to establish homogeneity: Calculate ơ 2 allow = (0.3 ơpt) 2 = (0.3x0.12) 2 = Calculate c = F1 ơ 2 allow + F2s 2 w = (1.59 x ) + (0.57 x 0.084) = c > Ss samples are homogenous = Since is less than 0.225, the batch of test items is homogenous.

22 Page 22 of 22 COAL CONCEPTS: Terms and Conditions Return of results: Laboratories participate in proficiency testing programs on the understanding that they will be sharing their results and information anonymously with other laboratories performing the same analysis. No return of results compromises the spirit of the programs, and reports will not be sent to laboratories unless they return results. Payment in full is required from all laboratories enrolling whether they return results or not. Errors in Participant Proficiency Testing Results: Proficiency testing reports should reflect the level of accuracy that a regular testing client would receive. If a participant finds an error in their proficiency testing results, they may notify us in writing and change their submission PRIOR to the due date for return. Changes after this time will not be accepted. Coal Concepts reports results as submitted by participants. On occasion, it seems as though participants have mixed up the samples or not processed the samples according to the instructions. Coal Concepts cannot make assumptions of this nature and change results 'to suit'. We also cannot compromise the integrity of the programs by suggesting to some participants that they should review their results prior to the due date. (This is unfair to other participants) It is the responsibility of the participants to check all aspects of the program, including sample identification, preparation, testing instructions, calculations and reporting of the results prior to results submission. If samples are not in good condition on arrival to the participant laboratory, Coal Concepts must be notified in writing IMMEDIATELY, as often samples can be replaced in good time. Claims about samples received in bad condition will not be accepted after the report has been issued. Late Enrolments and Late Results: Late enrolment requests cannot always be accommodated, as sample manufacture must be scheduled well in advance to the shipping date of the program to allow all necessary quality assurance activities to be carried out. Shipping of PT materials and evaluating test results from PTPs out of cycle with the mainstream programs is considerably time consuming and therefore costly. In order not to disadvantage participants able to comply with time frames, Coal Concepts may charge a late fee in the following circumstances: Requests that Coal concepts staff enters results on behalf of participants Requests to record results after the due date Requests for PTP participation that is out of cycle with the scheduled dates Shipping fees and Customs clearance: Costs incurred for shipping samples and clearance of same through customs are the responsibility of the participating laboratory unless otherwise indicated Non-payment of fees: Coal Concepts retains the right to withhold reports and/or test materials and services when invoices are outstanding. Confidentiality of results: All data and information received by Coal Concepts from its clients are considered confidential unless the client has given express permission to pass on information. Definitions: The dictionary definitions of collusion and falsification are as follows. Collusion: A secret agreement or cooperation for a fraudulent or deceitful purpose. Falsification: Deliberately changing something to be false. In proficiency testing terms, collusion is comparing data (and perhaps changing data) to fit in with a believed correct result. This is contrary to the spirit of proficiency testing programs, which are issued with the intention of providing an objective comparison of a laboratory s performance with others. Coal Concepts tries to minimise the occurrence of collusion by being aware that laboratories should be objective when they report their results, and should therefore not know the intended results at the time they are reporting to us. Answers are not provided to clients until results have been submitted. To prevent collusion and falsification our advice to clients is: DON T confer with others about PT samples or results. DO accept the fact that everyone makes errors. DON T average the results or opinions of every person in the laboratory before selecting the answer to be submitted. Instead, use one of the answers AS SUBMITTED to you and take advantage of the Coal Concepts internal QA services and submit all answers generated by the technicians. DO have confidence in your own results. Proficiency Testing (PT) is a compulsory part of laboratory accreditation, but it is also an important tool for giving you confidence in your results. Enhancing your PT results with assistance from another participant cannot increase confidence in your laboratory s performance. Coal concepts testing staff are not told what the expected results are, nor what we are expecting. We subject ALL results to analysis, even if they are different. The staff have the right to check that the results we enter on their behalf are correctly transcribed. Clients are always welcome to contact Coal Concepts to seek advice or information about collusion or falsification of data. Policy for Participant Appeal of PT Performance Assessment: If participants disagree with their performance assessment in a proficiency report, they should inform Coal Concepts in writing. The response will include Coal Concepts interpretation of the outcome of the reassessment and an explanation of that outcome. (For example, explanation of a calculation, or the rationale for the outcome of the evaluation.) If a mistake has been made by Coal Concepts, it will be dealt with via Coal Concepts non-conformance system. Liability In no event shall a party's liability to the other party for direct damages exceed an amount equal to the value of the amount for the PT Programme, under that specific month End of report