Dart Mining Nl · ASX:DTM
Dart Mining Nl — OREAS Victoria Minerals Roundup 2023
17 slides from Dart Mining Nl's conference presentation, Jun 22, 2023
Slide 1: Drilling into Victoria's Lithium Potential
Drilling into Victoria’s For personal use only Lithium Potential Preliminary Insights from Diamond Drilling the Dorchap Dyke Swarm Dr. Ben Hines OREAS Victoria Minerals Roundup Ballarat 2023 1
Slide 2: Forward Looking Statements Caution
FORWARD LOOKING STATEMENTS CAUTION For personal use only Certain statements contained in this document constitute forward looking statements. Such forward- looking statements are based on a number of estimates and assumptions made by the Company and its consultants in light of experience, current co
Slide 3: Geology & Site Setting
GEOLOGY & SITE SETTING • Northeast Victoria focus For personal use only • Central Lachlan Fold Belt • Silurian to Devonian magmatism • S- & I-type granites • Three orogenic events • Diverse geological setting • Orogenic Au • Porphyry Cu-Au, Mo-Cu-Ag • Li-Cs-Ta Pegmatites 3
Slide 4: Geochemical Trends
GEOCHEMICAL TRENDS For personal use only LCT Fractionation zone well defined by chip sample geochemistry Hines et al. (2023) Australian Journal of Earth Sciences 4
Slide 5: Mineralisation Model
MINERALISATION MODEL • Clearly defined fractionation For personal use only trend • P>Cs>Be>Nb≥Ta>Li>Sn • Specific composition of primary magma required • Timing & tectonic control integral to emplacement • Depth of emplacement & distance from host pluton also key factors Hines et al. (2023) Australi
Slide 6: Drill Testing
For personal use only DRILL TESTING 6
Slide 7: Drill Targets
DRILL TARGETS Boone’s N • Five dykes targeted for For personal use only preliminary diamond drilling Blair’s • Eagle • Fergusson’s • Blair’s • Boone’s • Rhodda Creek Fergusson’s • All returned Li in surface Eagle sampling • 3000m HQ drilling completed • Holes from 125 to 400m below surface • Tight a
Slide 8: Drill Hole Data - Eagle
DRILL HOLE DATA - EAGLE • Multiple dykes encountered For personal use only • Dip steeply to northeast • Form pods that plunge at 35-45° to northwest • Zones of recrystallisation evident • Reactivation of contacts apparent • Brittle host to late-stage sulphide mineralisation 8
Slide 9: Drill Hole Data – Eagle Dyke Geochemistry
DRILL HOLE DATA – EAGLE DYKE GEOCHEMISTRY For personal use only 50ppm Ag; 30% Zn o 17.77m @ 0.16% Li2O (exomorphic halo) o 4.92m @ 0.10% Li2O (exomorphic halo) o 12.66m @ 0.10% Li2O (pegmatite dyke) o 8.76m @ 0.08% Li2O (pegmatite dyke) o 5.2m @ 0.11% Li2O (exomorphic halo) o 7.9m @ 0.11% Li2O (exom
Slide 10: Drill Hole Data – Fergusson's
DRILL HOLE DATA – FERGUSSON’S • Single dyke steeply dipping southwest For personal use only • Reactivation of contacts • Coarse spodumene present • Solution banding highlighted by secondary phosphates 10
Slide 11: Drill Hole Data – Fergusson's Dyke Geochemistry
DRILL HOLE DATA – FERGUSSON’S DYKE GEOCHEMISTRY For personal use only o 0.49m @ 0.17% Li2O (exomorphic halo) o 3.01m @ 0.26% Li2O (pegmatite dyke), inc. 0.62m @ 1.63% LiO2 o 1.88m @ 0.11% Li2O (exomorphic halo) 11
Slide 12: Alteration
ALTERATION • Reasonably common eucryptite alteration rims and replacement For personal use only • Strong sericite alteration • Particularly on contacts • Despite enriched Li, Cs & Rb, no strong wallrock alteration apparent • Secondary phosphates present in some core 12
Slide 13: Structural Data – Drilling
STRUCTURAL DATA – DRILLING • Data across all holes logged to date For personal use only • Consistent with surface mapping 13
Slide 14: Summary & Preliminary Insights
SUMMARY & PRELIMINARY INSIGHTS • Exomorphic dispersion seems to be a significant characteristic of Li For personal use only mineralisation • Lithium grade in pegmatite variable • ‘nugget’ effect • alteration • Metamorphic and Hydrothermal alteration variable & requires further consideration • Good u
Slide 15: Acknowledgements
ACKNOWLEDGEMENTS For personal use only • Mitta Valley communities • Local suppliers • Sociedad Química y Minera (SQM) • North East Geological Contractors • DEECA & Goulburn-Murray Water • DDH1 Drilling • ALS Laboratories • Geocloud Analytics • Munro Geological Services 15
Slide 16: Questions?
For personal use only QUESTIONS? 16
Slide 17: Mineral Identification
MINERAL IDENTIFICATION • Back to basics – mineral properties • UV light instructive in core logging of LCT pegmatites For personal use only Natural Light Mixed UV Shortwave UV (254 nm) Longwave UV (365 nm) 17
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