alteration at the olympic dam iocg-u deposit · 2019. 12. 19. · 005 = albite 006 = anorthite 007...
TRANSCRIPT
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Dr Alan J MaugerGeological Survey of South Australia
2 December 2019, IOCG Workshop, Adelaide
Alteration at the Olympic Dam IOCG-U Deposit
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Olympic Dam
• World’s largest endowment of contained metal
• Au, Cu, Ag, U – highly economic
• What can HyLogger tell us that BHP Billiton don’t already know?
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Location of Olympic Dam
In relation to Gawler Silicic Large Igneous Province
After McPhie et al
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What minerals can be measured?
• Not all minerals have a distinctive spectral response at the wavelengths HyLogger measures
• SWIR
– OH Bond predominantly, harmonics
• TIR
– Primary molecular vibrations
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What the HyLogger saw…SWIR00 = Opal01 = Dickite ‘02 = Kaolinite-PX03 = Kaolinite-WX04 = Nacrite05 = Muscovite06 = Paragonite07 = Phengite08 = Montmorillonite09 = Nontronite10 = Saponite11 = Diaspore12 = Gibbsite13 = Prehnite14 = Pyrophyllite15 = Topaz16 = Chlorite-Fe17 = Chlorite-FeMg18 = Chlorite-Mg19 = Biotite20 = Phlogopite21 = Actinolite22 = Hornblende23 = Tremolite24 = Riebeckite
25 = Serpentine26 = Brucite27 = Talc28 = Epidote29 = Zoisite30 = Tourmaline31 = Tourmaline-Fe32 = Rubellite33 = Ankerite34 = Siderite35 = Calcite36 = Dolomite37 = Magnesite38 = Alunite-K39 = Alunite-Na40 = Alunite-NH41 = Gypsum42 = Jarosite43 = Palygorskite44 = Vegetation-Dry45 = IsaWhite46 = IsaYellow47 = PlasticChipTray48 = Teflon49 = WhiteMarker50 = Wood
51 = YellowMarker52 = MuscoviticIllite53 = ParagoniticIllite54 = PhengiticIllite
TIR000 = Opal001 = Quartz002 = Anorthoclase003 = Microcline004 = Orthoclase005 = Albite006 = Anorthite007 = Bytownite008 = Labradorite009 = Andesine010 = Oligoclase011 = Andradite012 = Grossular013 = Uvarovite014 = Almandine015 = Spessartine016 = Augite017 = Diopside
018 = Hedenbergite019 = Enstatite020 = Fayalite 021 = Forsterite022 = Olivine023 = Zircon024 = Andalusite025 = Cordierite026 = Marialite027 = Meionite028 = Vesuvianite029 = Analcime030 = Chabazite031 = Heulandite032 = Laumontite033 = Mesolite034 = Natrolite035 = Phillipsite036 = Thomsonite037 = Kaolinite038 = Kaolinite-PX039 = Illite040 = Muscovite041 = Paragonite042 = Mont-
morillonite
043 = Mont-morillonite-Na
044 = Nontronite045 = Smectite-Fe046 = Saponite047 = Axinite048 = Prehnite049 = Pyrophyllite050 = Topaz051 = Chlorite052 = Biotite053 = Phlogopite054 = Stilpnomelane055 = Actinolite056 = Amphibole-
ML48057 = Edenite058 = Ferro-
hornblende059 = Hornblende060 = Kaersutite061 = Tschermakite062 = Anthophyllite063 = Gedrite064 = Grunerite065 = Holmquistite066 = Mangano
cummingtonite067 = Arfvedsonite068 = Glaucophane069 = Riebeckite070 = Antigorite071 = Chrysotile072 = Lizardite073 = Talc074 = Clinozoisite075 = Epidote076 = Zoisite077 = Tourmaline078 = Cerussite079 = Smithsonite080 = Strontianite081 = Witherite082 = Azurite083 = Malachite084 = Ankerite085 = Rhodochrosite086 = Siderite087 = Aragonite088 = Calcite089 = Dolomite090 = Dolomite-Fe091 = Magnesite
092 = Alunite-K093 = Alunite-Na094 = Barite095 = Gypsum096 = Jarosite097 = Apatite098 = Vonsenite099 = Cassiterite100 = Goethite101 = Hematite102 = Ilmenite103 = Magnetite104 = Chromite105 = Gahnite106 = Psilomelane107 = Pyrolusite108 = Rutile109 = Palygorskite
163substances
82 - OD
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Which wavelength region is best?
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What the HyLogger saw…
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Location2013 – Section A-A – 30 Holes
2018 – Section B-B – 24 Holes
2013/18 – 75 Holes completed
Current campaign 60% completed
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Preliminary Plots from 75 Holes
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White Mica Story
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2013 -2014 Transect
• The remaining slides focus on Section A-A
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Feldspar Story
• Absence of Albite (?)
• HyLogger identified Plagioclase
• Alkis revealed presence of Plagioclase
• HyLogger maps Orthoclase and Microcline as distinct K-Feldspar species
• Plotted the HyLogger results in a QAP diagram
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K-Feldspar in the TIR
Orthoclase
Microcline
Mixtures compare slopes
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For the sake of modelling
• Calculated single value per hole
• Used “metres of mineral” as an approximation of abundance in a hole.
• Wavelengths – used averages
• Assays – used maximums
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Copper values
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Sericite and ChloriteSe
rici
te:
Dec
reas
ing
Al
Ch
lori
te:
incr
easi
ng
Fe
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K-Feldspar and Plagioclase
Microcline Orthoclase
OligoclaseAlbite
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QAP (modified)
Biotite OutDistal
Barren Core
OreQ – QuartzA – K-FeldsparP – Plagioclase
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From 1D to 2D
• Next few slides depict cross sections derived from HyLogger data and presented in GoCAD
• Blue is low number (wavelength or abundance). Red is a high number.
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Cu ppm
Orthoclase
Microcline
Albite
> An10
Scale: 3,000 m
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Illite
Muscovite
Phengite
W2200
Scale: 3,000 m
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W2250
Fe-Chlorite
Mg-Chlorite
K/Al ratio
Scale: 3,000 m
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Disclaimer
The information contained in this presentation has been compiled by the Department for Energy and Mining (DEM) and originates from a variety of sources. Although all reasonable care has been taken in the preparation and compilation of the information, it has been provided in good faith for general information only and does not purport to be professional advice. No warranty, express or implied, is given as to the completeness, correctness, accuracy, reliability or currency of the materials.
DEM and the Crown in the right of the State of South Australia does not accept responsibility for and will not be held liable to any recipient of the information for any loss or damage however caused (including negligence) which may be directly or indirectly suffered as a consequence of use of these materials. DEM reserves the right to update, amend or supplement the information from time to time at its discretion.
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Contact
Department for Energy and Mining – Mineral Resources DivisionGeological Survey of South Australia
Level 4, 11 Waymouth StreetAdelaide, South Australia 5000
T: +61 4 3283 5504E: [email protected]