APPLICATION OF FIELD PORTABLE XRF GEOCHEMICAL DATA IN THE BROKEN HILL REGION

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1 APPLICATION OF FIELD PORTABLE XRF GEOCHEMICAL DATA IN THE BROKEN HILL REGION Adam R. McKinnon Kimberley Metals Ltd (ex. CBH Resources Ltd) HANDHELD XRF USERS WORKSHOP & DISCUSSION FORUM

2 Outline of Presentation Field portable XRF (FP-XRF) data coverage in the Broken Hill region Utilisation of FP-XRF surveys in CBH Resources Regional Assessment Program Data collection and quality Comparison of FP-XRF with conventional soil analyses Selected statistical features of the FP-XRF dataset Data treatment and presentation Major regional scale features of the CBH dataset Potential further work with the FP-XRF datasets

3 FP-XRF in the Broken Hill Region FP-XRF geochemical data has been extensively collected in the region, most notably by Perilya Ltd. and CBH Resources Ltd. (along with their JV partners) Abundant outcrop renders the technique particularly useful in the Broken Hill region The FP-XRF geochemical datasets of Perilya and CBH Resources were released as a part of BHEI 2009 The combined datasets contain more than 195,000 individual FP-XRF readings Provides coverage to more than 450 km 2 of prospective ground surrounding Broken Hill

4 Perilya Dataset - >92,000 Points Combined Dataset - CBH >195,000 Dataset points >115,000 >450km Points 2 coverage

5 Why Use FP-XRF Geochemistry in the Broken Hill Region? BENEFITS Extensive outcrop makes the technique suitable Rapid coverage of large areas Assay of a large element suite (up to 19 elements) Immediate display of results Lower cost than conventional soil geochemistry Rapid delineation of drill targets ISSUES Higher detection limits than conventional soil geochemistry Not sensitive enough to detect some pathfinder elements Limited control on assay medium/soil size fraction Reliability can be affected by high temperatures Detection of anthropogenic contamination an issue

6 The CBH Resources Dataset Survey conducted on a nominal grid of 40 x 400 metres, closer infill sampling over many areas (down to 10x10m) Readings collected on surface component of soil only Reading collection time of 60 seconds per sample Up to 19 elements assayed at each point including Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Rb, Sb, Se, Sn, Sr, Zn and Zr Best response obtained for Zn, Pb, As, Cu, Mn, Fe, Rb and Sr Instrument regularly checked against a range of standards

7 FP-XRF Sample Density Nominal sampling density - 40 x 400m Higher density sampling - 20 x 200m or greater

8 Mean Median 90 th % 99 th % LLD (SRM)* Ag As Cd Co Cr Cu Fe Hg Mn Ni Pb Rb Sb Se Sn Sr Zn All values in parts per million *Quoted Lower Limit of Detection for a Standard Reference Material

9 Data Quality Use of Standards Variability in Zn measured against a standard February 2006 August 2007

10 Data Quality Variability Over Time 100 NIST LOW STANDARD (BAG ON) NIT080115_189_SC NIT060203_186_RB NIT060214_102_RB NIT060222_288_RB NIT060307_199_YG NIT060320_11_YG NIT060419_13_CK NIT060504_11_YG NIT060515_11_BA NIT060523_11_BA NIT060530_11_MR NIT060607_11_BA NIT060622_11_MR NIT060706_11_BA NIT060726_11_BA NIT060809_257_CK NIT060904_242_CK NIT060919_223_BA NIT061109_214_AP NIT061123_191_AP NIT061211_187_AP NIT070110_211_AP NIT070124_193_MU NIT070212_180_YG NIT070228_181_AP NIT070416_179_AP NIT070502_196_MR NIT070523_203_MR NIT070615_174_MR NIT070706_185_MR NIT070723_193_RB NIT070806_198_RB NIT070821_164_RB NIT070905_156_EC NIT070927_194_DD NIT071012_188_DD NIT071030_223_DD NIT071114_222_SC NIT071203_81_SC NIT071218_226_SC Sample ID/Date Cu (ppm)

11 Apollyon Valley Traverse - 6,482,800 N Apollyon Valley Traverse - 6,486,000 N Parts per Million Soil Pb Niton Pb 2000 Moderate 1500 anomaly Parts per Million detected in FP-XRF 1000 & soil analyses 500 Soil Pb Niton Pb Parts per Million Soil Zn Niton Zn Parts per Million Strong anomaly detected in FP-XRF analyses only Soil Zn Niton Zn Parts per Million Soil As Niton As Parts per Million Soil As Niton As Parts per Million Easting (me) Soil Cu Niton Cu Parts per Million Easting (me) Soil Cu Niton Cu

12 Data Quality Comparison with Conventional Soil Geochemistry FP-XRF Zn Zn As Pb As + Soil Geochem. Big Aller Zn-As-(Pb) FP-XRF Anomaly 40 km NNE of Broken Hill

13 Statistical Analysis - Stratigraphy Pb Zn Cu As Mn n Pb Bijerkerno Metasediments Pc Cartwright s Ck Metasediments S Sundown Group Bh Hores Gneiss Bk Silver King Formation Bf Freyers Metasediments Bp Parnell Formation Bs Purnamoota Subgroup Ba Allendale Metasediments Be Ettlewood Calc-Silicate Tr Rasp Ridge Gneiss Th Himalaya Formation Tc Cues Formation Tt Alders Tank Formation T Thackaringa Group Ta Alma Gneiss rm Retrograde micaceous schist All Samples Data presented are median values for each stratigraphic unit. Each point was assigned from the Broken Hill 1: Stratigraphic Sheet

14 Statistical Analysis - Stratigraphy Pb Zn Cu As Mn n Pb Bijerkerno Metasediments Pc Cartwright s Ck Metasediments S Sundown Group Bh Hores Gneiss Bk Silver King Formation Bf Freyers Metasediments Bp Parnell Formation Bs Purnamoota Subgroup Ba Allendale Metasediments Be Ettlewood Calc-Silicate Tr Rasp Ridge Gneiss Th Himalaya Formation Tc Cues Formation Tt Alders Tank Formation T Thackaringa Group Ta Alma Gneiss rm Retrograde micaceous schist All Samples Data presented are median values for each stratigraphic unit. Each point was assigned from the Broken Hill 1: Stratigraphic Sheet

15 Statistical Analysis Rock Types

16 Statistical Analysis Rock Types Pb As Zn Cu Mn Fe% n S Psammite-rich units M Psammopelite-rich units E Pelite-rich units SM Psammite & psammopelite-rich units SE Psammite & pelite-rich units EM Psammopelite & pelite-rich units F Composite gneiss and migmatite B Quartzo-feldspathic gneisses p Pegmatite L Feldspar & quartz-rich rocks +/- pegmatite Pl Plagioclase & quartz-rich rocks a Amphibolites and basic granulites c Calc-silicate rocks q Massive quartz and/or quartz-rich rocks qg Quartz-gahnite rocks gq Garnet-rich rocks rm Retrograde micaceous schists G Post folding granite intrusives Cz Cenozoic cover All Rock Types Data presented are median values for each rock type. Each point was assigned from the appropriate 1:25000 Geology Sheet

17 Regional Scale Data Treatment and Presentation To avoid biasing statistical analyses and creation of false anomalies, all infill was removed to produce a regular 40 x 400 or 20 x 200m grid Multiple normalisation regimes have been trialled, including to stratigraphy, rock type, cover vs outcrop and Mn and Fe concentrations Data density allows production of high contrast contour plots for each element Additive ratio plots are useful for displaying major anomalies and structural features of the dataset Ratio of Zn + 2Pb + 10As found to be particularly useful

18 Normalisation to Rock Type 1 km 1 km Raw Pb+Zn Data Rock Type Normalised Pb+Zn Data

19 Anthropogenic Features in the Dataset Contamination from historic mining activities form the largest anomalies in the CBH dataset for Pb, Zn, Mn and As Biggest anomalies in the dataset to the east and southeast of the Line of Lode; probably due to prevailing wind direction Highest values closest to Broken Hill; median values >600ppm for Pb and >1000ppm for Zn. Strong circular feature ( rail anomaly) 2 km west of Broken Hill also due historic ore treatment activities Using deeper soil samples may be solution in these areas yet to be tested

20 FP-XRF Regional Scale Features - Pb Allendale Apollyon Valley Daydream Mine (contamination?) Maybelle Nine Mile Sundown Anomaly (contamination?) Native Dog Rail Anomaly (contamination) Contamination

21 FP-XRF Regional Scale Features - Zn Big Aller Allendale Apollyon Valley Ettlewood Maybelle Wolseley Nine Mile Sundown Anomaly (contamination?) Rail Anomaly (contamination) Native Dog Contamination

22 FP-XRF Regional Scale Features - As Big Aller Mt Robe Synform Allendale Apollyon Valley Maybelle Ettlewood Nine Mile Rail Anomaly (contamination) Contamination

23 FP-XRF Regional Scale Features - Mn Big Aller Mt Robe Synform Allendale Wolseley Native Dog Rail Anomaly (contamination) Contamination

24 FP-XRF Regional Scale Features - Fe

25 FP-XRF Regional Scale Features - Rb

26 FP-XRF Regional Scale Features - Sr

27 Potential Further Work Integration of PEM and CBH datasets potential for regional scale FP-XRF geochemistry maps Implementation / improvement of levelling and standardisation regimes to improve usability Study of regolith controls on FP-XRF responses Close-spaced orientation surveys, identification of characteristic responses for BH-type deposits Integration of FP-XRF datasets with other exploration data

28 Acknowledgements CBH Resources Ltd, Perilya Limited and Silver City Mining Ltd (and their JV partners) are thanked for permission to present this work Much of this work is derived from Broken Hill Regional Assessment Program conducted by the former CBH Resources exploration team in particular J. Brigden, G. Jones and J. Randell Brian Casey and his team in Broken Hill spent several years and walked immense distances collecting the data presented

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