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ENEROYLABORATOR/ES, INC. • 2393 Salt Creek Highway (82601) • P.O. Box 3258 • Casper, WY82602 <br />Toll Free 888 235 0515 • 307.235.0515 • Fax 307.234.1639 • casper@energylab.com • www.energylab.com <br />LABORATORY ANALYTICAL REPORT <br />leIlent: Denison Mines (USA) Corp <br />Project: West Sunday Mine <br />Lab ID: C09030572-003 <br />Client Sample ID: West Sunday #4 <br />Report Date: 04/02/09 <br />Collection Date: 03/17/09 08:00 <br />DateReceived: 03/18/09 <br />Matrix: Aqueous <br /> <br />Analyses <br />Result <br />Units <br />Qualifiers <br />RL MCU <br />QCL Method <br />Analysis Date / By <br />MAJOR IONS <br />Carbonate as C03 ND mg/L 1 A2320 B 03130/09 12:58 / Ijl <br />Bicarbonate as HC03 412 mg/L 1 A2320 B 03/30/0912:58 / Ijl <br />Calcium 28 mg/L D 2 E200.7 04/01/09 18:26 / rdw <br />Chloride 491 mg/L 1 A4500-CI B 03/26/0912:57 / sp <br />Fluoride 1.7 mg/L 0.1 A4500-F C 0320/09 13:00 / Ijl <br />Magnesium 11 mg/L D 2 E200.7 04/01/0918:26 / rdw <br />Nitrogen, Nitrate+Nitrite as N ND mg/L 0.1 E353.2 03/26/0913:35 /jai <br />Nitrogen, Nitrite as N ND mg/L 0.1 A4500-N02 B 03/19109 07:52 / jai <br />Potassium 21 mg/L 1 E200.7 03/31/0919:04 / rdw <br />Silicon 4.1 mg/L D 0.3 E200.7 04/01/0918:26 / rdw <br />Sodium 2240 mg/L D 1 E200.7 04101/09 18:26 / rdw <br />Sulfate 4260 mg/L D 60 A4500-S04 E 0325/0913:53 / sp <br />PHYSICAL PROPERTIES <br />Hardness as CaC03 113 mg/L 1 A2340 B 04/01/0918:26 / kbh <br />Solids, Total Dissolved TDS 180 C 6990 mg/L 10 A2540 C 03/1810915:15 / dd <br /> <br />?-DISSOLVED <br /> ND ug/L 100 E200.7 03/31/0919:04 / rdw <br />Antimony ND ug/L 50 E200.8 03/19/0916:45 / is <br />Arsenic 29 ug/L 1 E200.8 03/19/0916:45 / is <br />Barium 120 ug/L 100 E200.8 03119/09 16:45 / is <br />Beryllium ND ug/L 10 E200.8 03/19/0916:45 / is <br />Boron 324 ug/L D 200 E200.7 04/01/0918:26 / rdw <br />Cadmium ND ug/L 10 E200.8 03/19/0916:45 / is <br />Chromium ND ug/L 50 E200.8 03/1910916:45/ Is <br />Cobalt 76 ug/L 10 E200.8 03/19/09 16:45 / is <br />Copper 47 ug/L 10 E200.8 03/19/0916:45 / is <br />Iron 155 ug/L D 100 E200.7 03/31/0919:04 / rdw <br />Lead ND ug/L 50 E200.8 03/19/0916:45 / is <br />Lithium 847 ug/L 100 E200.7 03/31/0919:04 / rdw <br />Manganese 294 ug/L 10 E200.8 03/19/0916:45 its <br />Mercury ND ug/L 1 E200.8 03/19/0916:45 / is <br />Molybdenum 271 ug/L 100 E200.8 03/19/09 16:45 / is <br />Nickel ND ug/L 50 E200.8 03119/09 16:45 / is <br />Selenium 51 ug/L D 2 E200.8 03/19/0916:45 / is <br />Silver ND ug/L 10 E200.8 03/19/09 16:45 / is <br />Thallium ND ug/L 100 E200.8 03/19/09 16:45 / is <br />Uranium 17.9 ug/L 0.3 E200.8 03/19/0916:45 / is <br />Vanadium ND ug/L 100 E200.8 03/19/0916:45 / is <br />Zinc 78 ug/L 10 E200.8 03/19/09 16:45 / is <br />port RL - Analyte reporting limit. MCL - Maximum contaminant level. <br />flnitions: QCL - Quality control limit. ND - Not detected at the reporting limit. <br />D - RL increased due to sample matrix i nterference.