Geological setting of the Ranger uranium deposits. Greg Rogers Manager Exploration

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1 Geological setting of the Ranger uranium deposits Greg Rogers Manager Exploration 1

2 IAEA types of uranium deposits IAEA (2000) classification Sub-categories/other names Australian examples Black shale deposits N/A Breccia complex deposits IOCG-U Olympic Dam; Mt Painter Collapse breccia pipe deposits Intrusive deposits 1. Intrusive-related 1. Crocker Well; Westmoreland 2. Pegmatites 2. Bynoe; Harts Range Lignite N/A Metamorphic deposits Skarns Mary Kathleen Metasomatite deposits Metasomatic Valhalla, Skal Phosphorite deposits Phosphate Mt Lucy; Georgina Basin Quartz-pebble conglomerate deposits Conglomerate Sandstone deposits N/A Nullagine 1. Roll-front/tabular 1. Manyingee; Bigrlyi 2. Palaeochannel 2. Beverley 3. Lignitic 3. Mulga Rock Surficial deposits Calcrete Yeelirrie; Lake Way; Lake Maitland; Napperby Unconformity-related deposits 1. Unconformity-Alligator River 1. Ranger; Jabiluka; Koongarra; Nabarlek 2. Unconformity-Rum Jungle 2. Rum Jungle; Dyson s 3. Unconformity-Rudall 3. Kintyre 4. Unconformity-South Alligator Valley 4. Coronation Hill Vein deposits Volcanic deposits Volcanic-related Ben Lomond; Maureen Other types of deposits Shear-related Oasis; Greenvale 2 Westmoreland; Turee Creek; Mundong; Angelo

3 Discovery history of Ranger mine The Ranger mine is one of the world s largest uranium mines How did this start?... Actually, with a joint venture to explore for zinc-lead projects in Northern Australia 3

4 History of ERA the 1968 Gondwana JV JV aim was to explore for Zn-Pb deposits 4

5 The discovery of Ranger mine 1966: Geopeko base established in Darwin begins base metal search at Brocks Creek based on Rum Jungle model 1968: Gondwana Joint Venture formed 1968: BMR amends age of outcrops on Munmarlary Station to Archaean 1969: field party decides ground exploration not possible, airborne survey commissioned. Noranda begins survey on adjoining ground and discovers Ranger 1 anomalies Geopeko camp established on site Dec : ground radiometry and drilling begins at Ranger 1, outlines potential by mid-year for release to stock exchange 5

6 6 Munmalary radiometrics 1973

7 Ranger one project = 9 radiometric anomalies No 3 Orebody No 1 Orebody For >25 years, the world s largest and most intense TC gamma anomaly 7

8 8 Early drilling Ranger anomalies

9 Regional geological setting Alligator Rivers Uranium Field MLN1 Lower Cahill Jabiluka Kombolgie RPA Ranger 1 Orebody 3 & Deeps Mine Area Ranger 1 Orebody 1 5km 9

10 Local stratigraphy Scale: 10 Kilometres (after Eupene) 10

11 2

12 Uranium mineralisation Mafic Breccia UMS Breccia Carbonate Stylolite Pegmatite 12

13 Alteration types & distribution Graphite Chlorite Silica Hematite 13

14 Alteration geophysics responses MLN1 Lower Cahill Lower Cahill MLN1 Jabiluka RPA RPA Mine Area Mine Area 5km 14 Jabiluka 5km

15 Structural architecture Reverse faulting Subhorizontal thrust placing UMS schists on Kombolgie Plus steep west dip of Kombolgie contact with LMS Highly sheared carbonaceous UMS along LMS contact Evidence for 2 main deformation events D1 Top End Orogeny NNW-SSE extension (creation of bounding faults) Pegmatite intrusion Deposition of the Kombolgie sandstone D2 ENE-WSW compression, brittle-ductile reverse faulting, uranium mobilization and deposition E-W trending bounding faults invoked Clear evidence for S fault Ranger Synform related to normal faulting (half graben) and/or LMS dissolution 15

16 Unresolved Issues Relative timing of events & mineralisation More structural mapping Geochronology Study (GA) Reactivation & remobilisation evidence Strike slip movement on thrust faults Fluid origins & transport mechanisms Basinal Brines Basement Fluid inclusion analysis Uranium origin Archean, Proterozoic, Carpentarian? Very deep U in LMS (>600m) 16

17 Exploration Implications Ore genesis models Many Models All have strengths and weaknesses Each model explains aspects of ore forming process without conflict Assess with all available tools geophysics & fluid flow modelling drilling & careful study Don t be single model driven complex systems need multiple models Persevere 17

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