Laterite Leach Tests

ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits
The data, see Figure 4.22, show that the uranium distribution in both leach feeds was
concentrated in the fines, with uranium concentrations in the < 38 µm fines of 2580 and 3150
ppm U3O8 for Junnagunna and Redtree, respectively. The < 106 µm fractions of both ores
represented about 40% of the total mass, but contained 65 and 57% of the uranium. As shown
in Figure 4.23, leaching did not markedly change the size versus uranium distribution in the
leached residues, with 40-50% of the unleached uranium in the < 106 µm fractions.
Size
(µm)
TABLE 4.13
Junnagunna - Distribution of Uranium Before and After Leaching (base case)
Cumulative
wt% Passing
Feed (1370 ppm U3O8) Residue Grade (34 ppm U3O8)
Grade
(ppm
U3O8)
Cumulative
U Passing
(%)
Cumulative
wt%
Passing
Grade
(ppm
U3O8)
Uranium
Extraction
(%)
Cumulative
U Passing
(%)
425 99.9 100 99.7 100.0
300 94.0 293 98.7 91.5 16 94.7 92.7
212 70.7 489 89.7 68.7 15 97.0 73.6
150 54.1 785 79.5 51.1 14 98.2 59.5
106 40.0 1326 64.9 37.7 14 99.0 49.2
75 30.5 1499 53.7 29.4 15 99.0 42.3
53 23.3 1671 44.3 23.0 16 99.1 36.6
45 20.5 1910 40.1 20.3 20 99.0 33.7
38 17.9 1977 36.2 18.7 23 98.8 31.5