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Austria Conference-07 kh-iaea-mongolian rift basins-2012
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  • EUR, Europe; KAZ, Kazakhstan; SIB, Siberia; MON, Mongolia; JUN, Junggar; TAR, Tarim; NCB, North China Block; SCB, South China Block; K, Korea and Shandong; J, Japan; QA, Qaidam; QI, Qiangtang; LH, Lhassa; SH, Shan Thai; INC, Indochina. MOS ¼ Mongol-Okhotsuk Ocean
  • Yazhikov, V. 1996. Uranium raw material base of the Republic of Kazakhstan and prospects of using in situ leach mining for its development. In: In Situ leach uranium Mining. Proceedings of IAEA Technical Committee Meeting, Almaty, Kazakhstan, September 1996.
  • Tertiary Aged FTMP- 20-25 MA

Austria Conference-07 kh-iaea-mongolian rift basins-2012 Presentation Transcript

  • 1. Uranium Prospectivity of Mongolian BasinsKristl Hoksbergen 1, Enkhbayasgalan Dugerjav 2,Munkhbold Nayam-Ochir 21Cameco Corporation, 2 Cameco Mongolia29, May, 2012
  • 2. Key Messages● Mongolia has a complex structural past, with Jurassic and Cretaceous tectonism creating many extensional rift basins along the main Mongolian lineament;● These extensional basins contain many uranium occurrences as well as deposits containing a combined total of over 25,000 tonnes U;● Uraniferous basins consist of the same elements many of the unexplored basins contain;● The Tamsag basin in Mongolia covers an area of over 48,000 km2;● Sediments of the Tamsag are highly prospective for the formation of sandstone hosted uranium deposits;● Mongolia is highly unexplored, and contains many basins prospective for sandstone hosted uranium. IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 2 A Global Prospective -May 29th, 2012
  • 3. Sandstone Deposits of the World-Coordinates taken from the IAEA Database IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 3 A Global Prospective -May 29th, 2012
  • 4. Location Map IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 4 A Global Prospective -May 29th, 2012
  • 5. Sandstone Uranium in Mongolia 2,460 tonnes U 3,039 tonnes U 3,000 tonnes U 9,800 tonnes U-Tonneage taken from the IAEA database IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 5 A Global Prospective -May 29th, 2012
  • 6. Palinspastic ReconstructionModified from Ito et al, 2006 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 6 A Global Prospective -May 29th, 2012
  • 7. Tectonic Terranes of Mongolia Main Mongolian Lineament-Modified after Badarch et al, 2002 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 7 A Global Prospective -May 29th, 2012
  • 8. Mongolian Meso and Cenozoic Basins IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 8 A Global Prospective -May 29th, 2012
  • 9. Basin Development in MongoliaModified from Traynor and Slayden, 1995 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 9 A Global Prospective -May 29th, 2012
  • 10. Extensional vs Contractional Basins Kazakhstan -Modified from Yazikov, 1996Both Figures Diagrammatic - Not to scale Karoo (Selous) Basin Tanzania -Modified from Catuneanu, 2005 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 10 A Global Prospective -May 29th, 2012
  • 11. Rift Sedimentary EnvironmentsModified from Ito et al, 2006 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 11 A Global Prospective -May 29th, 2012
  • 12. Rift Basin Stratigraphy- An ExampleModified from Ito et al, 2006 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 12 A Global Prospective -May 29th, 2012
  • 13. The development of a uranium bearing Mongolian rift basin IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits:Slide 13 A Global Prospective -May 29th, 2012
  • 14. Initiation of Jurassic rifting IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits:Slide 14 A Global Prospective -May 29th, 2012
  • 15. Deposition of Jurassic volcanoclastics and mafic extrusives IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits:Slide 15 A Global Prospective -May 29th, 2012
  • 16. Lower Cretaceous rifting and syn-riftsedimentation of coal bearing lacustrine and fluvial sediments IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 16 A Global Prospective -May 29th, 2012
  • 17. Rifting ceases at the end of the Lower Cretaceous. Deposition of post-rift UpperCretaceous red beds and fluvial sediments, minor fault reversal IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits:Slide 17 A Global Prospective -May 29th, 2012
  • 18. Deposition of Cenozoic alluvial deposits and prominent basin inversion IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 18 A Global Prospective -May 29th, 2012
  • 19. Location of sandstone-hosted uranium deposits Structural Roll Front Basal Channel IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits:Slide 19 A Global Prospective -May 29th, 2012
  • 20. Basin Focus: Tamsag Basin Tamsag Basin LEGEND IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 20 A Global Prospective -May 29th, 2012
  • 21. Basin Focus: Tamsag BasinModified from Davaa, 2010 IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 21 A Global Prospective -May 29th, 2012
  • 22. W-E Property Interpreted Basin SectionCMK-140CMK-144CMK-141 CMK-145 CMK-146 Alluvium K1 Sediments 1 km IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 22 A Global Prospective -May 29th, 2012
  • 23. W-E Property Cross-Section from DrillingCMK-140 CMK-144 CMK-143 CMK-141 CMK-145 CMK-146 10 m 1 km IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 23 A Global Prospective -May 29th, 2012
  • 24. Requirements for Uranium Deposition Source Transport TrapUraniferous Rocks; -Fluid Conduit; Reducing Agent;- “Hot” Granites -Porous/permeable sands: -Organic trash-Volcaniclastics -Braided/Meandering -Pyrite -Alluvial Fans -H2S/Hydrocarbons -Deep seated structures IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 24 A Global Prospective -May 29th, 2012
  • 25. Conclusions● Large sandstone hosted uranium systems are usually found in contractional basins (foreland basins);● Rift basins typically develop as a series of sub- basins, are more compartmentalized, and produce more closed depositional systems;● However, rift basins are capable of hosting economic deposits, including the Karoo Basin of Africa, and several basins in Mongolia;● Mongolian Cretaceous basins contain suitable uranium source rocks, host stratigraphy and efficient mineralization traps;● Mongolia contains many aerially extensive rift basins that are relatively unexplored. IAEA Technical Meeting: The Origin of Sandstone Uranium Deposits: Slide 25 A Global Prospective -May 29th, 2012