1. Uranium Deposits

2. Geography of U Deposits – USA States with mineable resources States currently producing U 3 O 8

3. Geography of major U Deposits – USA

4. North Dakota’s Uranium Deposits

5. Sedimentary Host Rocks Sandstones and Arkoses –Porous –Permeable –Lower pH than incoming water Coal and lignite beds –Also have low pH compared to inflowing water

6. Sedimentary-hosted Uranium Deposits Very high tonnage but lower grade (compared to unconformity type) U transported by ground water U deposited as water encounters a reducing environment (organic matter or gas, sulfide minerals) Drop in pH results in precipitation of U minerals in pore spaces.

7. Prerequisites for a Sedimentary- hosted Uranium deposit 1)Source of U 2)Coarse sands with good porosity and permeability 3)Ground water flow (naturally oxygenated) – ideally channelized, high rate of flow 4)Reduction zone – heavy minerals, decaying organic matter

8. Uranium Deposit host Rocks Wasatch Formation - PRB

9. Fort Union Formation - PRB

10. Wind River Formation, Puddle Springs Member – Gas Hills

11. Wind River Formation Shirley Basin

12. Battle Spring Formation Great Divide Basin