South Australian Uranium Mineral Systems: A spectrum of mineralisation across the ages and across styles.
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1 South Australian Uranium Mineral Systems: A spectrum of mineralisation across the ages and across styles. Martin Fairclough Chief Geoscientist, Geological Survey of South Australia
2 Overview Update of Existing Uranium Mining Operations Exploration Projects to Watch Exploration Overview Mineral Potential Modelling (IOCG±U) Summary
3 Uranium exploration expenditure in Australia South Australia continued to lead the nation as the primary state to explore for uranium in Expenditure for uranium exploration in 2008 was $94 million accounting for 43% of Australia s total uranium exploration expenditure. Hosts two of Australia s three uranium mines, Olympic Dam & Beverley, with a third under construction at Honeymoon. Recent discoveries include: Four Mile (Quasar & Alliance Resources) Hillside (Rex Minerals) Mullaquana (Uranium SA) $94m 43% $35m 16% $58m 26% $34m 15% SA NT Qld Other
4
5 Marla TYPES OF URANIUM DEPOSITS (known and potential) Breccia complex e.g. OD Sandstone(roll-front) e.g. Beverley, Honeymoon, Warrior U/C redox related? Vein style e.g. Crocker Well, Radium Hill Calcrete-hosted? Oodnadatta Moomba Coober Pedy WARRIOR Ceduna OLYMPIC DAM Tarcoola Andamooka MT PAINTER BEVERLEY YARRANNA HONEYMOON Port Augusta RADIUM HILL Moonta Moonta Vein Roll front Port Lincoln Renmark Adelaide Kingscote Breccia Unconformity Robe Mt Gambier
6 Olympic Dam Copper-Gold-Uranium-Silver BHP Billiton Ltd Olympic Dam Largest uranium deposit, fourth largest remaining copper deposit and fifth largest gold deposit in the world. Also contains significant quantities of silver. Total Resource 8339 Mt at 0.88% Cu, 0.028% U 3 O 8, 0.31 g/t Au and 1.5 g/t Ag Gold only (non-sulfide) resource 151 Mt at 1.0 g/t Au. Reserve (ore) 399 Mt at 1.87% Cu, 0.058% U, 0.68 g/t Au and 4 g/t Ag. Production 2007/ t Cu, 4144 t U 3 O 8, oz Ag, oz Au.
7 Olympic Dam Copper-Gold-Uranium-Silver BHP Billiton Ltd Olympic Dam CURRENT ACTIVITIES: Expansion study continuing. Full Environmental Impact Statement released May Full production is set down for New 60 Mtpa Olympic Dam will have an approximate annual production of: t Cu, t U 3 O 8, oz Au, oz Ag.
8 Olympic Dam Olympic Dam Expansion Copper-Gold-Uranium-Silver BHP Billiton BHP Billiton Ltd Olympic Dam
9 Beverley Mine Uranium Heathgate Resources Ltd Beverley Largest in-situ leach operation in the world. Total Resource 7.7 Mt at 0.27% U 3 O 8 for a contained commodity of t U 3 O 8. Production 2007/ t U 3 O 8. Expansion of the Beverley Uranium Mine approved August CURRENT ACTIVITIES: Successful exploration has continued in the east and south of the current mineral lease as part of the Beverley Expansion.
10 Honeymoon Uranium Uranium One Inc Mitsui & Co. Ltd Honeymoon Construction commenced, production to commence in Indicated Resource 1.2 Mt at 0.24% containing 2900 t (6.5 Mlb) U 3 O 8. Estimated annual production of 400 t U 3 O 8. Deposit occurs as five discrete mineralised sand packages in the Yarramba Palaeochannel. Structural influence to mineralisation.
11 Four Mile Uranium Quasar Resources Alliance Resources Ltd Four Mile Tertiary sandstone-hosted mineralisation in two distinct zones: Four Mile West and Four Mile East. Inferred resource of 3.9 Mt at 0.37% U 3 O 8 containing t U 3 O 8. Mining Lease Application submitted in May First Stage mining proposed for early Production estimated between tpa U 3 O
12 Crocker Well Mt Victoria Uranium PepinNini Minerals Ltd Sinosteel Crocker Well Inferred JORC compliant resource 12.5 Mt at 0.5 kg/t (0.05%) U 3 O 8 (cut off grade 300 ppm). Production scheduled to commenced in Mineral lease application submitted to investigate production of ~ 600 t of U 3 O 8 for at least 10 years.
13 Projects to Watch Yarranna 1: 8m at 626ppm U 3 O 8. Goulds Dam: Indicated resource 1.7 Mt at 0.12% containing 2000 t U 3 O 8. Other Deposits Projects to watch Major Mine Prominent Hill Four Mile Beverley Olympic Dam Wirrda WellMt GeeMt Painter Acropolis Oak Dam Cane Grass Goulds Dam Oban Yarranna 1 Crocker Well Honeymoon Mullaquana Hillside Radium Hill Adelaide Oban: Drillhole CEY376 intersected >5m (above 100ppm eu 3 O 8 ) grade thickness of 0.28m% eu 3 O 8. Mt Gee: Inferred 51 Mt at 615ppm for t U 3 O 8. Hillside: 297ppm U 3 O 8, 887ppm U 3 O 8. Mullaquana: Pirie Basin, Eyre Peninsula. Inferred resource estimate 12 Mt at 0.02% eu 3 O 8 for 2700 t U 3 O 8.
14 Undiscovered Resources Where to from here? how to from here? Mineral Deposit Models and/or Mineral Systems modelling?
15 Uranium Deposit Classification 1. UNCONFORMITY-RELATED 2. SANDSTONE 3. QUARTZ-PEBBLE CONGLOMERATE 4. VEIN 5. BRECCIA COMPLEX 6. INTRUSIVE 7. PHOSPHORITE 8. COLLAPSE BRECCIA PIPE 9. VOLCANIC 10. SURFICIAL 11. METASOMATITE 12. METAMORPHIC 13. LIGNITE 14. BLACK SHALE 15. OTHERS
16 Uranium Deposit Classification 1. UNCONFORMITY-RELATED 2. SANDSTONE 3. QUARTZ-PEBBLE CONGLOMERATE 4. VEIN 5. BRECCIA COMPLEX 6. INTRUSIVE 7. PHOSPHORITE 8. COLLAPSE BRECCIA PIPE 9. VOLCANIC 10. SURFICIAL 11. METASOMATITE 12. METAMORPHIC 13. LIGNITE 14. BLACK SHALE 15. OTHERS
17 Mineral Systems Based upon understanding all the geological ingredients which comprise the mineral system, and how they vary and relate to each other... PROCESSES! One side effect of utilising the Mineral Systems approach and concentrating on processes is that we are forced to consider related deposit types through time and space Case study - Regional IOCG±U potential, particularly using geophysics in areas of limited outcrop (which should work in outcropping areas)
18 URANIUM MINERAL SYSTEMS and FLUIDS MAGMATIC- RELATED U SYSTEMS (7) Volcanic (8) Intrusive (9) Vein Magmatichydrothermal fluids Meteoric, seawater (7) Volcanic m i x i n g mixing (10,12,13,14) (4) Calcrete U Groundwaters (1) Shallow U-bearing hematite IOCG HYBRID U SYSTEMS (1,5,9,10,11) Deep (mgt) IOCG (3) Sandstone U Formation waters / connate waters (5) Metasomatic (9) Vein (2) Unconformity U (PGE, Au) Diagenetic fluids m ix ing BASIN- and SURFACE- RELATED U SYSTEMS METAMORPHIC - RELATED U SYSTEMS (6) Metamorphic fluids (incl. metamorphic rock-buffered) (#) represent deposit types from IAEA Red Book & Dahlkamp (1990). Skirrow et al, 2009, Geoscience Australia
19 Mineral Systems Based upon understanding all the geological ingredients which comprise the mineral system, and how they vary and relate to each other... PROCESSES! One side effect of utilising the Mineral Systems approach and concentrating on processes is that we are forced to consider related deposit types through time and space. We can then delineate the consequences of these processes as mappable criteria In SA we can map criteria for sandstone-hosted, unconformity related and IOCG±U potential, particularly using geophysics in areas of limited outcrop (which should work in outcropping areas)
20 Mineral Systems Mappable criteria
21 Uranium Occurrences Map Known uranium occurrences and significant geological parameters for each deposit type have been collated and represented spatially as key ingredients maps. First step in predictive modelling for different uranium deposit types: IOCG±U Groundwater gradients, chemistry and distance from source. Basement controlling structures. Pandurra Formation 3D Model. Fairclough, M.C., McAvaney, S.O. and Wilson, T.C. (compilers) South Australian Uranium Occurrences Updated second edition. 1: scale. Department of Primary Industries and Resources SA.
22 Mineral Systems In detail for hard rock systems...
23 Iron Oxide - Copper - Gold ± Uranium Hiltaba Intrusions Prominent Hill Olympic Dam Gawler Range Volcanics Carrapateena sq km 200 km Moonta - Wallaroo Hillside ADELAIDE
24 Mineral Systems In detail for soft rock systems...
25 Eromanga Basin Eucla Basin Warrior Prominent Hill Mt Gee Olympic Dam Beverley Carrapateena Oban Narlaby Yaninee Crockers Well Honeymoon Rollfront/ Palaeochannel Uranium Moonta - Wallaroo Murray Basin ADELAIDE ~ 55 to 2 Ma
26 Reactive Transport Modelling oxidised granite elevated U Palaeochannel oxidised basin fill 12 km reduced layers oxidised layers pyrite out REDOX front hematite in REDOX front
27 Mineral Systems In detail for hard/soft rock systems...
28 View from SE
29 Basement highs Restricted Sub-basins Basement +/- basin faulting U-rich Hiltaba Suite Older Reducing sediments
30 Mineral Systems In detail for IOCG systems...
31 Deposit Style Proterozoic Fe Oxide-Cu-Au+/-U Deposits. Examples of this style of deposit include Olympic Dam, Henry, Starra, La Candelaria, Osborne. The major districts of these deposits in Australia are the Gawler Craton (South Australia), Mt Isa Eastern Succession (Queensland) and the Chile Coastal Belt. Important characteristics for this class include Age, Tectonic Setting, Association with Igneous Activity, Structural Control, Morphology Three of the most important are alteration, mineralogy and structure - Host rocks are intensely altered (sodic potassic, potassic or hydrolytic alteration) - Abundance of Fe-oxide (not iron sulphides) and a suite of metals that may include U, Cu, Au, Ag, Mo, Co, As, Zn and minor REE s - Strong potential field characteristics easily mappable!
32 Reduced Oxidized Ernest Henry Magnetite K-feldspathization Cpy Breccia-hosted Minor shearing Sue Dianne Olympic Dam Hematite Hematite K-feldspathization Sericitization Cpy-Bnt Cpy-Bnt-Cct Breccia-hosted Breccia-hosted High T Deep (5-6 km) Low T Shallow (<2 km)
33 Olympic Dam Geology and structure
34 Contributors to the formation of Olympic Dam Roxby Downs structure Granite Co-eval felsic volcanism surficial fluids hydrothermal fluids magmatic fluids Olympic Dam
35 Contributors to the formation of Olympic Dam Roxby Downs Granite Olympic Dam
36 HOT GRANITES South Australian heat flow anomaly 200 km Petratherm Pacific Hydro Geodynamics Eden Scopenergy Eden Petratherm Perilya/Green Rock Eden Geothermal Proactive Resources Havilah Eden 9 Geothermal Licensees or applicants 60 Geothermal Exploration Licences over 27,968 km² Only some will eventuate but the total indicative 5-year work programs correspond to more than $400 Million Just 1 GEL has hot rock emissionfree energy potential to yield electricity equivalent to several Snowy Mountain Hydro Schemes 1 SM approx 550 MWe Geothermal Exploration Licence Application (GELA) Sedimentary basin outline Electricity supply Scopenergy
37 Heat Flow Profile HOT GRANITES across the Olympic Dam Deposit
38 POTENTIAL FIELD - MAGNETICS Geophysics Total Magnetic Intensity00)
39 POTENTIAL FIELD - GRAVITY
40 S OD N V=H 50 km
41 POTENTIAL-FIELD INVERSION N 1.5% magnetite Includes all susceptible minerals as their magnetite equivalent 0.5% hematite Includes hematite, sulfides, other dense minerals, and remanent magnetisation 25 km
42 POTENTIAL-FIELD INVERSION 10 km
43 Targeting of zones of high fluid flow eastern Gawler Craton
44 Mineral Potential Modelling IOCG±U Potential Method Area selection.
45 Mineral Potential Modelling IOCG±U Potential Method Area selection. Residual gravity and residual RTP TMI.
46 Mineral Potential Modelling IOCG±U Potential Method Area selection. Residual gravity and residual RTP TMI. Contouring.
47 Mineral Potential Modelling IOCG±U Potential Method Area selection. Residual gravity and residual RTP TMI. Contouring. Selection of anomalies.
48 Mineral Potential Modelling IOCG±U Potential Method Area selection. Residual gravity and residual RTP TMI. Contouring. Selection of anomalies. Determine geophysical highs - gravity.
49 Mineral Potential Modelling IOCG±U Potential Method Area selection. Residual gravity and residual RTP TMI. Contouring. Selection of anomalies. Determine geophysical highs - gravity. Determine geophysical highs - magnetics.
50 Mineral Potential Modelling IOCG±U Potential Result The result, coincident gravity and magnetic anomalies offset by no more than metres.
51 Mineral Potential Modelling IOCG±U Potential Uses Preliminary exploration site selection. Key Ingredients Mapping: Coincident anomalies. Hiltaba Granites. Gawler Range Volcanics. Faults. Depth to basement.
52 Mineral Potential Modelling IOCG±U Potential Uses Preliminary exploration site selection. Key Ingredients Mapping. Mineral Potential Models: Weights of evidence. Neural network. Expert system.
53 Mineral Potential Modelling IOCG±U Potential Uses Preliminary exploration site selection. Key Ingredients Mapping. Mineral Potential Models: Weights of evidence. Neural network. Expert system.
54 Mineral Potential Modelling IOCG±U Potential Uses Preliminary exploration site selection. Key Ingredients Mapping. Mineral Potential Models. 3D visualisation. Olympic Dam Carapateena
55 Mineral Potential Modelling IOCG±U Potential Uses
56 Mineral Potential Modelling IOCG±U Potential Further Work Shape recognition properties: Elongation Compactness
57 Mineral Potential Modelling IOCG±U Potential Uses - Extrapolating to other areas
58 Mineral Potential Modelling
59 Mineral Potential Modelling
60 Mineral Potential Modelling
61 Mineral Potential Modelling IOCG±U Potential Further Work Shape recognition properties: Elongation Compactness Incorporate alteration data: HyLogger Petrological Database Apply to the eastern Gawler Craton IOCG±U province
62 Summary South Australia has 40% of known resources in Uranium. Underlying Hiltaba event has generated the largest single uranium deposit in the world and subsequently... Overlying sedimentary successions provide excellent trap sites for world class projects ( eg. Four Mile). The Mineral Systems approach is a powerful predictive tool for undiscovered resources
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