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02 wood iaea 2012

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  • 1. The Application of Geophysics in Exploring forSandstone-Hosted Uranium in MongoliaGarnet Wood1, Clinton Keller1, Orgil Bayarsaikhan 21Cameco Corporation, 2Cameco MongoliaIAEA Conference: The Origin of Sandstone Hosted Uranium Deposits: A Global PerspectiveVIC, Vienna, Austria: May 29 – June 1, 2012
  • 2. Outline● Geophysical survey objectives for sandstone uranium deposits● Dundgovi and Tamsag projects – Regional geology – Regional and detailed geophysical results● Conclusions 2
  • 3. Geophysical Survey Objectives● Provide information that will assist in the understanding of the morphology of Cretaceous basins in Mongolia, focusing exploration and guiding timely land evaluation● Provide detailed information on near surface geology that assists in understanding of the structural and stratigraphic settings at regional and prospect scales● Guide drill hole targeting for environments favorable for sandstone hosted uranium mineralization● Enhance value derived from geophysical data through continual integration with drill results 3
  • 4. Location Map4
  • 5. Mongolia – Regional Geology5
  • 6. Mongolia – Geological Map6
  • 7. Mongolia – Deposit Models Roll FrontStructural Tabular Basal Channel (Internal Cameco figure) 7
  • 8. Dundgovi 5 – Regional Geology Khairhan Kharaat Nars Dulaan Uul8
  • 9. Dundgovi 5 – Location Map9
  • 10. Mongolia – StratigraphyStratigraphy Formation Member Lithology Description KZ (CENOZOIC) Baruunbayan Mudstone member Primary Red Coloured Mud K2 (UPPER FormationCRETACEOUS) (Sainshand Sandstone Reddish mud layers interbedded Formation) with unconsolidated red sand. Mud member matrix Siltstone member Grey coloured silt Khukhteeg Formation (Upper part Siltstone/Sandstone Grey siltstone and sandstone of Zuunbayan member interbedding. Siltstone dominated K1 Formation) Gravel member (LOWER Pebbles, gravels, conglomerates.CRETACEOUS) Shinekhudag Formation Siltstone member Dark grey coloured carbonaceous silt with clay interbedding (Lower part of Zuunbayan Formation) Gravel member Green-grey gravelly sand. 10
  • 11. Dundgovi 5 – Regional Gravity11
  • 12. Dundgovi 5 – Regional Magnetics12
  • 13. Dundgovi 5 – Regional Gravity13
  • 14. Dundgovi 5 – Conceptual Target Overburden (variable thickness) Cretaceous sandstone 0- K2 horizonDepth (m) K1 horizon 500 - Basement Basement faults 14
  • 15. Dundgovi 5 – Seismic Line 1 5 mGal Magnetics 300 nT Shot Point (km) Gravity 0 1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 0.0 0.1 0.2Two Way Traveltime (s) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VE = 5.5 1.1 15
  • 16. Dundgovi 5 – Seismic Line 1 5 mGal Magnetics 300 nT Shot Point (km) Gravity 0 1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 0.0 0.1 Tertiary sediments DG5-001 0.2Two Way Traveltime (s) 0.3 Cretaceous 0.4 stratigraphy 0.5 0.6 Basement rocks 0.7 0.8 0.9 1.0 VE = 5.5 1.1 16
  • 17. Drill Hole DG5-001 Shot Point (km) 11.22 11.34 11.46 11.58 11.70● Sonic log (grey) overlain on drill hole 150 trace of DG5-001 200● Dashed line is interpreted fault 250 targeted by DG5-001 Depth (m) 300● Black line is interpreted K2 K2/K1 contact based 350 on drill core and sonic 400 log data K1 450 500 550 17
  • 18. Dundgovi 5 – Seismic Line 2 300 nT Magnetics 5 mGal Gravity Shot Point (km) 0 1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 15.0 0.0 0.1 0.2Two Way Traveltime (s) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VE = 5.5 1.1 18
  • 19. Dundgovi 5 – Seismic Line 2 300 nT Magnetics 5 mGal Gravity Shot Point (km) 0 1.5 3.0 4.5 6.0 7.5 9.0 10.5 12.0 13.5 15.0 0.0 0.1 0.2Two Way Traveltime (s) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VE = 5.5 1.1 19
  • 20. Tamsag 1 – Location Map20
  • 21. Tamsag 1 – Regional Geology21
  • 22. Tamsag 1 – Regional Geophysics22
  • 23. Tamsag 1 – Seismic Line 1 Magnetics 300 nT 3 mGal Shot Point (km) Gravity 0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 0.0 0.1 0.2Two Way Traveltime (s) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 VE = 12 23
  • 24. Tamsag 1 – Seismic Line 1 Magnetics 300 nT 3 mGal Shot Point (km) Gravity 0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 0.0 0.1 0.2 Upper CretaceousTwo Way Traveltime (s) 0.3 0.4 0.5 Lower Cretaceous 0.6 0.7 0.8 0.9 1.0 1.1 VE = 12 24
  • 25. Tamsag 1 – Seismic Line 1 Magnetics 300 nT 3 mGal Shot Point (km) Gravity 0 3.0 6.0 9.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 0.0 MTK-001 MTK-002 MTK-003 0.1 0.2Two Way Traveltime (s) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 VE = 12 25
  • 26. Conclusions● Regional geophysical data (airborne magnetics and ground gravity) is a valuable tool in understanding the regional architecture of Cretaceous basins in Mongolia● Seismic data has proven to be invaluable in detailing the structural and stratigraphic settings within these basins● Seismic data has provided the detail required for targeting in geological environments thought to be prospective for sandstone hosted uranium mineralization● Drill hole information has added significantly to the understanding and interpretability of the geophysical data● Seismic data, coupled with drilling, has provided increased confidence in land retention decisions 26