The Langer Heinrich Project is a calcrete-hosted secondary uranium deposit associated with valley-fill sediments in an extensive Tertiary palaeo-drainage system and is host to a Mineral Resource of 74,415t U3O8 at a grade of 0.06% U3O8 (250ppm U3O8 cut-off grade) in seven contiguous mineralised zones designated Detail 1 to 7, within the 15km length of the paleo-drainage system. Uranium occurs as carnotite, an oxide mineral containing both uranium and vanadium, deposited as thin films lining cavities and fracture planes and as grain coatings and disseminations. Mineralisation is near-surface, between one metre and 30m thick, and between 50m and 1,100m wide, depending on the width of the palaeo-valley.
Resources stand as announced in 2008. The updated resource announced on 28 August 2008 represented a significant uplift to the resource previously announced in early 2006 with an increase of 68% in tonnes and 3% decrease in grade combining to produce a 64% increase in contained metal. The Mineral Resource is detailed below at a cut-off grade of 250ppm U3O8.
Mineral Resource estimate (depleted for mining) for Details 1 to 7:-
| 250ppm Cut-off |
Mt |
Grade % U3O8 |
t U3O8 |
Mlb U3O8 |
| Measured Resources |
32.8 |
0.06 |
19,582 |
43.158 |
| Indicated Resources |
23.6 |
0.06 |
13,276 |
29.260 |
| Measured & Indicated |
56.4 |
0.06 |
32,858 |
72.418 |
| Inferred Resources |
70.7 |
0.06 |
41,557 |
91.591 |
(Figures may not add due to rounding and are quoted inclusive of any Ore Reserves)