Slide 1: CRITCON 2023: The Kalkaroo Copper-Gold Deposit: A Critical Minerals Treasure Trove
CRITCON 2023 The Kalkaroo Copper-Gold Deposit: A Critical Minerals Treasure Trove Chris Giles, Technical Director, Havilah Resources Limited Traviss Just, Senior Geologist, Havilah Resources Limited Havilah Resources
Slide 2: Kalkaroo Critical Minerals – Key Points
Kalkaroo Critical Minerals – Key Points • The Kalkaroo copper-gold mineralisation has associated appreciable levels of critical minerals, including cobalt (Co), molybdenum (Mo), rare earth elements (REE) and tungsten (W). • This critical minerals association is seen at many other copper prospects dr
Slide 3: Curnamona Province Geological Setting
Curnamona Province Geological Setting • Hosts the giant Broken Hill lead-zinc-silver orebody. • Curnamona Province (ca1720Ma) may have once been joined to the similar age Gawler Craton and Mt-Isa 100 km Cloncurry Block – hence sharing similar prospectivity. • Little outcrop in the Kalkaroo area, hen
Slide 4: Kalkaroo Critical Minerals – Co, Mo, REE and W
Kalkaroo Critical Minerals – Co, Mo, REE and W • Kalkaroo is a moderately large copper-gold-cobalt deposit containing 1.1 million tonnes of copper, 3.1 million ounces of gold and 23,200 tonnes of cobalt in JORC resources (refer to table at end). • Classified as a structurally controlled stratabound
Slide 5: Supergene and Primary Sulphide Replacement Ore
Supergene and Primary Sulphide Replacement Ore Deep supergene weathering is superimposed on the primary sulphide ore Native copper in saprolite oxidised ore Primary sulphide ore (chalcopyrite and pyrite) Havilah Resources 5 5
Slide 6: Cobalt in Pyrite at Kalkaroo
Cobalt in Pyrite at Kalkaroo • Extensive metallurgical testwork shows Kalkaroo pyrite contains appreciable amounts of the critical metals cobalt (0.28 - 0.40%) and nickel (up to 0.1%) as well as gold (1.8 - 3.5ppm) and copper (0.9 - 1.8%) (ASX announcement 9 May 2019). • Kalkaroo ore primary sulphid
Slide 7: Molybdenum at Kalkaroo
Molybdenum at Kalkaroo Coarse molybdenite (light grey) intergrown with chalcopyrite (yellow) and biotite (dark grey). Length of photomicrograph is 1.3mm. Reflected light. Metallurgical test work indicates the molybdenite floats readily. N approx. 500m The central part of the Kalkaroo orebody is rich
Slide 8: REE at Kalkaroo
REE at Kalkaroo • Re-assaying of earlier drillholes in saprolite gold ore from West Kalkaroo confirmed elevated REE including drillhole KKAC0491: 20 metres of 4,152 ppm TREEO*, 1.57 g/t gold and 0.58% copper from 62-82 metres. KKAC0491 (ASX announcement 23 April 2020). • This included 10 metres of 6
Slide 9: REE Research Collaboration
REE Research Collaboration • A fruitful research collaboration with the University of South Australia’s Future Industries Institute identified bastnasite, a carbonate-fluoride mineral, as the primary REE host (ASX announcement 3 November 2020) • Electron microprobe analysis of the bastnasite mineral
Slide 10: Conventional Sulphide Ore Processing Technologies Applicable
Conventional Sulphide Ore Processing Technologies Applicable 1 Open pit mining 3 Conceptual processing of Kalkaroo sulphide ore Pyrite concentrate containing 0.3% Co, 2.5 g/t Au, 1% Cu FLOAT Leaching Roasting of pyrite & 2 Ore crushing / grinding leaching of calcine Moly REE Copper Recovery 28%+ 90%
Slide 11: Metal Zonation Within Kalkaroo Orebody
Metal Zonation Within Kalkaroo Orebody • The arrow indicates the general Up sequence direction of the inferred temperature gradient, which is interpreted to have controlled the sequence of metal deposition. • Because the temperature gradient was also up stratigraphy the metals tend to be confined to
Slide 12: Critical Minerals in the Wider Curnamona Province
Critical Minerals in the Wider Curnamona Province DRILLHOLE FROM TO Cu Au Ce Dy Er Eu Gd Ho La Lu Nd Pr Sm Tb Tm Y Yb KALKAROO1 (metres) ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm ppm KKAC0421 72 73 3990 0.67 2030 103.5 51.3 51.2 186 18.8 2150 6.58 1355 366 236 21 6.85 572 41.9
Slide 13: Croziers Copper Prospect
Croziers Copper Prospect • Results for a single drillhole (BNG13DD001) at the Croziers copper prospect show elevated levels of the higher value MREE (ASX announcement 7 January 2020). • Using the light-REE lanthanum as a proxy for these elements there is a broad REE mineralisation envelope at Crozie
Slide 14: Characterisation of Curnamona Province REE
Characterisation of Curnamona Province REE Based on the work of Emeritus Professor Ken Collerson Havilah REE patterns superimposed on typical field Havilah REE field superimposed on the REE patterns for exhibited by carbonatites, agpaitic undersaturated Bayan Obo carbonatites and fenites (data from
Slide 15: Kalkaroo Critical Minerals – Key Conclusions
Kalkaroo Critical Minerals – Key Conclusions • The Kalkaroo copper-gold mineralisation has associated appreciable levels of critical minerals, including cobalt, molybdenum, rare earth elements and tungsten. • This critical minerals association is seen at many other copper prospects drilled by Havila
Slide 16: Kalkaroo JORC Ore Reserve and Mineral Resources
Kalkaroo JORC Ore Reserve and Mineral Resources Kalkaroo JORC Ore Reserves as at 31 July 2022 from Havilah 2022 Annual Report Footnotes to 2022 JORC Ore Reserve and Mineral Resource Tables Kalkaroo JORC Mineral Resources as at 31 July 2022 from Havilah 2022 Annual Report 1 Details released to the AS
Slide 17: Cautionary and Competent Person’s Statements
Cautionary and Competent Person’s Statements Cautionary Statement The information contained in this presentation is not financial product advice and does not constitute an offer. The presentation is for information purposes and is of a general and summary nature only. Neither Havilah Resources Limit