Mineral Prospectivity Analysis of the Wagga-Omeo Belt, NSW
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Mineral prospectivity analysis of the Wagga-Omeo Belt, NSW David Robson* Antony Mamuse & Pietro Guj Geological Survey of NSW Centre for Exploration Targeting, Perth SMEDG Meeting 24 October 2013 Exploration activity since ~1970 Not much Lots Why Wagga Wagga? • 50 year old maps • Increasing Land Use pressure • Metal potential • Tectonic questions 100k map coverage Wagga Wagga Mapping • Tin prospectivity analysis; • hydrogeochemistry; • Aster study; • Radioelement re-processing; • <2x2 km gravity; SMEDG Meeting 24 October 2013 Location and generalised geology Koetong Supersuite (report available at booth/DIGS GS 2013-0833) SMEDG Meeting 24 October 2013 Gravity Data (Pre-2013) Magnetic Data SMEDG Meeting 24 October 2013 Studentized contrast values for various lithological units within Wagga Tin Belt SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Studentized contrasts values for (A) magnetic, (B) gravity, (C) radiometric and (D) SRTM elevation datasets used in this study SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Probability classes WofE Model 8 – lithology + TMI SMEDG Meeting 24 October 2013 Probability classes WofE Model 14 – Koetong + TMI + ternary radioelement SMEDG Meeting 24 October 2013 Probability classes WofE Model 17 – Koetong buffer + TMI + ternary radioelement SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Model 8 - lithology & TMI High 2.7% of area Moderate 4% of area Low 93.3% of area SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Fitting rate capture efficiency comparisons of WofE models SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Tin prospectivity SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Distribution of Tin deposits SMEDG Meeting 24 October 2013 Summary • WofE prospectivity mapping; • Zipf’s Law for resource estimation; • deposit-density regression modelling 191 known deposits + 796 predicted tin deposits = 987 deposits 987 deposits contain > 380,000 tonnes contained tin 82,000 tonnes contained tin already found 300,000 tonnes of contained tin is undiscovered Zipf’s Law estimates largest deposit ~ 25,000 tonnes Clustering (Conditional Dependance) = 10? deposits ~ 5,000 tonnes Sn 100? deposits ~ 500 tonnes Sn (270,000 t of Sn) SMEDG Meeting 24 October 2013 Wagga Region Hydrogeochemistry Study Analysing bore • water pH • salinity (EC) • oxidation state (Eh) • temperature. SMEDG Meeting 24 October 2013 Eastern Riverina Collingullie Granite: Hydrogeochemistry Very High U Also Mo, Li, (Sc) Study Low Rb, K 1) 1L (carbon) and 300ml (Alkalinity) bottle filled straight from bore. 2) 300ml of filtered bore water is put in a bottle. (anions) 3) 300ml of filtered bore water is put in another bottle (Acid) 4) While filtering is taking place the pH and Ec are monitored and recorded. The testing done in CSIRO Perth gives results for approximately 40 different elements and has a sensitivity of parts per trillion. SMEDG Meeting 24 October 2013 km 0 10 20 40 60 80 BARMEDMAN ! Ni (µg/L) ARDLETHAN Nickel ! TEMORA ! 34°30'S • Red dot is NARRANDERA High Ni ! JUNEE ! within the 35°0'S Wantabadgery Granite Frampton WAGGA WAGGA "! Collingullie Granite Volcanics Ni (µg/L) Ni 81 Burrandana Granite 8 - 13 3 - 5 35°30'S 0 - 3 HOLBROOK ! 146°30'E 147°0'E 147°30'E 148°0'E km 0 10 20 40 60 80 BARMEDMAN ! Mo (µg/L) Molybdenum ARDLETHAN ! TEMORA ! 34°30'S Interesting Response NARRANDERA ! • Jindera JUNEE ! Granite 35°0'S Wantabadgery Granite • Holbrook WAGGA WAGGA Mo (µg/L) "! Mo Collingullie Granite Granite 72 17 - 22 • Wantabadgery Burrandana Granite 7 - 10 Granite 3 - 6 35°30'S 1 - 3 • Collingullie 0 - 1 Granite HOLBROOK ! • Frampton 146°30'E 147°0'E 147°30'E 148°0'E Volcanics kmkm 0 0 10 10 20 20 4040 6060 8080 BARMEDMAN ! Sn (µg/L) ARDLETHAN Tin ! TEMORA ! 34°30'S • Subdued response NARRANDERA ! (solubility JUNEE ! issues?) 35°0'S Wantabadgery Granite WAGGA WAGGA • Wagga "! Collingullie Granite Group, Sn (µg/L) Burrandana Granite Wantabadger Sn 0.6 - 0.7 Sn (µg/L) y and 35°30'S Sn 0.1 - 0.2 0.6 - 0.7 0.10.0 - 0.2- 0.1 Collingullie 0.0 - 0.1 HOLBROOK ! Granite? 146°30'E 147°0'E 147°30'E 148°0'E km 0 10 20 40 60 80 BARMEDMAN ! W ( µg/L) ARDLETHAN ! Tungsten TEMORA ! 34°30'S Interesting Response NARRANDERA ! • Collingullie JUNEE ! Granite 35°0'S Wantabadgery Granite • Burrandana WAGGA WAGGA "! W (µg/L) Collingullie Granite Granite W 14.4 - 33.6 7.0 - 8.0 Burrandana Granite • Wantabadgery 2.0 - 5.3 0.9 - 1.2 Granite 35°30'S 0.4 0.0 - 0.2 • Frampton Volcanics HOLBROOK ! 146°30'E 147°0'E 147°30'E 148°0'E km 0 10 20 40 60 80 BARMEDMAN ! Rb:K ARDLETHAN ! Rubidium:Potassium TEMORA ! 34°30'S • Differing NARRANDERA ! Granites? JUNEE ! 35°0'S Wantabadgery Granite WAGGA WAGGA Rb:K "! Rb KSW Rb:K Collingullie Granite Rb KSW 2.7 - -6.0 6.0 1.1 - -2.4 2.4 Burrandana Granite 0.4 - -1.0 1.0 0.1 - -0.3 0.3 35°30'S 0.0 - 0.1 0.0 - 0.1 -0.30.0 - -0.1 -0.6 - -0.4 -0.3 - -0.1 HOLBROOK ! -0.6 - -0.4 146°30'E 147°0'E 147°30'E 148°0'E Extracting mineralogical and geomorphological information using new ASTER mineral maps with airborne geophysics by R Hewson, D Robson, A Mauger, T Cudahy, M Thomas, S Jones. Australia wide maps have recently been generated and released by CSIRO and Geoscience Australia using the 14 band satellite-borne ASTER sensors. Seventeen map products related to surface composition have been developed, based on spectral absorption features representing either abundance of mineral groups, specific minerals and their chemistry, vegetation cover or regolith related characteristics. This study aims to test the geoscience mapping capabilities of these products, individually, and integrated with airborne geophysics and DEMs within the agricultural Wagga Wagga region. SMEDG Meeting 24 October 2013 Wagga 100K Mapsheet – masked radiometrics Slope masked K Slope masked Th Radiometrics : 10%+ Slope masked Significant differences in S- granite/adamellite chemistry - different feldspar (orthoclase?) types? Masking result appears to reflect major changes in geological units Slope masked U Slope masked Ternary rather than affected by floodplain and parna/aeolian blanket cover. Wagga ASTER-Geophysics Study – Preliminary Results, Dr R Hewson March 2013 Mag Low CSIRO / GA ASTER Mineral Map – Quartz / silica content Blue = low content, Red = High content Increased Quartz / silicification along structural axis ? Samplied evidence of increased quartz float & quartz veining in samples Uranium The newest frontier in NSW U² / Th SMEDG Meeting 24 October 2013 U Before NASVD • Flown 1996-2000 • mixed U-Th ‘noise’ • Reprocessed 2013 SMEDG Meeting 24 October 2013 Brian Minty U After NASVD SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Gravity 2km x 2km & 1km x 1km (11,000 stations) SMEDG Meeting 24 October 2013 GRAVITY Cootamundra / Wagga Wagga / Tallangatta 1:250,000 sheets Old data NEW data 11km 2km & 1km SMEDG Meeting 24 October 2013 SMEDG Meeting 24 October 2013 Wagga – Omeo Belt – applying NEW technology to an under-explored area – the NEW place to be – the RIGHT place to explore!!! SMEDG Meeting 24 October 2013 Thanks SMEDG Meeting 24 October 2013 NSW Statewide Geology & Geophysics for Phones • Available for Android smart phones and Apple iPhones • Entire map is downloaded to your phone – so no mobile reception is required in the field • Your current location is marked – indicating the geology under your feet • Geology map is the most popular – 20,000 downloads •1:1 500 000 Surface Geology, Total Magnetic Intensity, Radiometrics, TMI 1VD • To download the maps, google ‘geoscientific data warehouse’ to find our site .. http://dwh.minerals.nsw.gov.au SMEDGE Meeting 24 October 2013 NSW Detailed Geology Maps for Phones • Available for Android smart phones and Apple iPhones • Entire map is downloaded to your phone – so no mobile reception is required in the field • 246 maps are available – 1:250 000, 1:100 000, 1:50 000 & 1:25 000 • List the Geology maps that cover your area of interest – then choose which to download • To download the maps, google ‘geoscientific data warehouse’ to find our site .. http://dwh.minerals.nsw.gov.au SMEDGE Meeting 24 October 2013 Thanks SMEDG Meeting 24 October 2013 .