OREAS 104

Low grade uranium reference material OREAS 104 was prepared from samples sourced from the Crocker Well Project located in the Olary District of the Curnamona Province of South Australia. Uranium mineralization occurs within basement intrusives primarily as thorian brannerite as a disseminated accessory mineral or in fractures, breccias or quartz veins in sodic plagioclase rich mesoproterozoic granitoids and gneisses. In the east of the deposit uranium occurs as davidite. The Crocker Well material was blended with barren rhyodacite to achieve the desired grade of uranium in OREAS 104.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
U, Uranium (ppm) 126 8 122 131 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 152 11 145 159 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 48.8 2.70 46.7 50.9 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 102 7 97 108 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 7.11 0.140 7.00 7.21 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 3.90 0.300 3.70 4.10 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.29 0.080 1.23 1.36 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 9.40 0.900 8.60 10.20 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 1.36 0.080 1.29 1.43 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.39 0.100 2.32 2.46 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.48 0.020 0.46 0.50 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 49.5 1.40 48.3 50.7 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 12.8 0.70 12.2 13.4 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 10.5 0.70 9.9 11.2 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 1.39 0.14 1.26 1.52 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.57 0.040 0.53 0.61 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 3.43 0.180 3.31 3.54 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 154 10 130 179 Pressed Powder Pellet XRF
U, Uranium (ppm) 125 7 105 146 Pressed Powder Pellet XRF
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