JOSH LEIGH Project Exploration Geologist June ASX Code AIV

Transcription

1 COALSTOUN AND BOOUBYJAN Porphyry Copper-Gold Complexes, their structural setting, geology and geochemistry Joshua Leigh 1, Doug Young 2, Jose Veracruz 3, Paul Ashley 3 - ( 1 ActivEX Limited, 2 Consultant, 3 University of New England) JOSH LEIGH Project Exploration Geologist June 2015 ASX Code AIV

2 Porphyry Complex Locations 2

3 Coalstoun and Booubyjan Intrusive Complexes Located within the Northern New England Orogen. Northern portions of the Esk Basin and southern portions of the Good Night Block. Approximately 4 hours drive north of Brisbane. Deposit location within the Esk Basin, NNEO, QLD 3

4 Coalstoun and Booubyjan Intrusive Complexes Coalstoun: Hosted within the Carboniferous meta-argillites of the Good Night beds U-Pb age: 234 ± 2.3 Ma & ± 2.3 Ma (Kor, 2010) K-Ar age: 235 ± 4 Ma (Ashley et al., 1978) Booubyjan: Hosted within the Middle Triassic (237 Ma) andesitic volcanics and derived sediments of the Mount Marcella Volcanics K-Ar age: ± 14.6 Ma and ± 18.9 Ma (Harvey et al., 2008) ERRONEOUS DATES U-Pb dating planned 250k regional geology of deposit area 4

5 Coalstoun and Booubyjan Intrusive Complexes At 232 to 237 Ma (late Middle Triassic) NEO positioned on western margins of Gondwana Westward subduction Development of the Neara Arc in NNEO ca. 242 to 235 Ma Very extensive subduction zone Position of the NEO during porphyry emplacement (redrawn by Veracruz after Cawood et al. 2011) 5

6 Coalstoun and Booubyjan Intrusive Complexes Westward subduction Neara Arc development Associated Porphyry emplacement NNW trending mineralisation parallel to subduction trend Wider intrusive belt to south might be related to a shallower subduction angle Porphyry development in the NNEO during the Middle Triassic (modified by Veracruz after Campbell [2005] and complemented with Wilkinson [2013]) 6

7 Volcanic Dominance in the northern Esk Basin Northern Esk Basin - high density of volcanism Two generations of subduction related volcanism Middle Triassic Late Triassic Middle Triassic Penwhaupell Volcanic Centre Ettiewyn Caldera High-K calc-alkaline andesitic volcanism Associated with porphyry mineralisation event Late Triassic change to extensional volcanism Gayndah Centre Mungore Cauldron Bimodal basaltic to rhyolitic alkali to calc-alkaline volcanism Potentially covers and preserves prior porphyry mineralisation Why so much volcanism!? 250k regional geology of deposit area 7

8 The Darling River Lineament Location 8

9 The Darling River Lineament Satellite Imagery COALSTOUN BOOUBYJAN 9

10 The Darling River Lineament Magnetics COALSTOUN BOOUBYJAN 10

11 The Darling River Lineament Gravity COALSTOUN BOOUBYJAN 11

12 Darling River Lineament Major structure Inherited from Rodinia breakup ca. 900 to 750 Ma Traced for ~2000 Km along strike Coincident with the boundary between many geological terrains including the Yarraman Subprovince, Coastal Subprovince and North D Aguilar Subprovince. Structurally prepared the upper crust for igneous ascension and porphyry emplacement 250k regional geology of deposit area 12

13 Coalstoun Intrusive Complex Geology Ridges: Quartz-pyrite hydrothermal breccias to zones of silicification Valleys Porphyritic intrusives Biotite-feldspar phyric ± quartz ± hornblende microtonalite to microdiorite porphyries Lesser dacite to rhyolitic intrusives known Meta-argillite hosts of the Good Night beds Coalstoun Intrusive Complex 13

14 Coalstoun Intrusive Complex Geology Extensive exploration since the mid-60 s Targeting largely Cu at the Coalstoun Porphyry (previously Central Area Ashley et al., 1978) Lesser Cu at the Eos Porphyry (previously Southern Area ) and Nyx Porphyry (previously Northern Area ) Au exploration targeting peripheral Au mineralisation in hydrothermal breccias Current Cu resource Total Inferred 0.38% Cu (for 102,700t Cu contained) Supergene enriched 0.47% Cu (for 32,700t Cu contained) ActivEX concentrating on the central Coalstoun Porphyry Coalstoun Intrusive Complex 14

15 Coalstoun Intrusive Complex Geology 15

16 Coalstoun Intrusive Complex Geology 16

17 Coalstoun Porphyry Geochemistry Cu Mo Zn Assayed soils Au Ag Pb 17

18 Coalstoun Porphyry Geochemistry Cu Mo Zn pxrf (Niton) soils Fe/Zr K/Ti Rb/Sr 18

19 Coalstoun Porphyry Geophysics Mild coincidence of low resistivity with anomalously high Fe/Zr soil geochemistry Possibly highlighting areas of remnant Fe after pyrite from phyllic alteration with secondary argillic alteration caused by pyrite dissolution from weathering pxrf Fe/Zr Resistivity - 75m RL depth slice 19

20 Coalstoun Porphyry Geophysics Moderate coincidence of low chargeability with anomalously high Mo soil geochemistry Possibly highlighting less chargeable Morich core pxrf - Mo Chargeability - 75m RL depth slice 20

21 Coalstoun Porphyry Geophysics Good coincidence of magnetic highs with anomalously high Cu soil geochemistry Possibly highlighting magnetite alteration with an inner Cu-rich core pxrf - Cu Helimag - RTP 21

22 Booubyjan Intrusive Complex Geology Porphyritic intrusives Feldspar phyric ± hornblende ± biotite ± quartz microdiorite, quartz micromonzodiorite, microgranodiorite and quartz microdiorite porphyries Higher Au content in Kakapo and Hinds Porphyries Lesser late mafic intrusives known Andesitic volcanic hosts of the Mount Marcella Volcanics Booubyjan Intrusive Complex 22

23 Booubyjan Intrusive Complex Geology Extensive exploration since the early 70 s Targeting largely Cu at the White Horse Porphyry and Kiwi Porphyry Less exploration at the Kakapo Porphyry and Hinds Porphyry Best intersections 0.96% Cu & 0.09g/t Au (White Horse) 0.62% Cu & 0.7g/t Au (Hinds) 0.47% Cu & 0.49g/t Au (Kakapo) ActivEX concentrating on the central White Horse Porphyry Booubyjan Intrusive Complex 23

24 White Horse & Kiwi Porphyries Geology Detailed grid mapping revealing critical relationships Peripheral hydrothermal breccias Siliceous framework Silica-tourmaline framework Peripheral wallrock sheeted and stockwork veins Post-mineral late mafic intrusives known Andesitic pyroclastic breccia, airfall tuff and volcaniclastic host Mount Marcella Volcanics White Horse and Kiwi Porphyries 24

25 White Horse & Kiwi Porphyries Geology 25

26 White Horse & Kiwi Porphyries Geology 26

27 White Horse & Kiwi Porphyries Geochemistry Cu Pb Zn Assayed soils Fe K/Sr Au 27

28 White Horse & Kiwi Porphyries Geochemistry Cu Pb Zn pxrf (Niton) soils Fe K/Sr Mo 28

29 White Horse & Kiwi Porphyries Geophysics Moderate coincidence of low resistivity with anomalously high Cu soil geochemistry Possibly highlighting areas of secondary argillic alteration pxrf - Cu Resistivity - 50m depth slice 29

30 White Horse & Kiwi Porphyries Geophysics Moderate coincidence of chargeability highs with anomalously high Fe soil geochemistry Possibly highlighting areas remnant Fe after pyrite from phyllic alteration pxrf - Fe Chargeability - 170m depth slice 30

31 White Horse & Kiwi Porphyries Geophysics Mild coincidence of diffuse magnetic high with anomalously high Mo soil geochemistry Possibly highlighting magnetite alteration with an inner Mo-rich core pxrf - Mo Ground magnetics - RTP 31

32 Property track south of the Booubyjan Intrusive Complex, looking west Questions?

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