CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


Deposit number Country Location Names Commodities
76 Australia (South Australia) 30.37.14 S -- 136.44.56 E Acropolis Cu; Au; U
 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-04
   
Deposit name(s): Acropolis
Political location(s): Australia; Province or state: South Australia; Nearest community: Adelaide
Deposit clan (type): Olympic Dam-type
Deposit (sub) types: Olympic Dam-type; Predominace of apatite-bearing magnetite veins and large bodies suggest Kiruna-type mineralization; alteration assemblage hematite-sericite-chlorite indicates late stage hydrothermal activity
Deposit status: prospect; Size category: unknown; Status comments: 11 drill holes widely spaced over 50 sq km tested strong near-coincident gravity and magnetic anomalies 25 km southwest of Olympic Dam as a part of Western Mining Corp. project started in 1975
Geologic province: Gawler Craton
Geologic subprovince: Stuart Shelf
Geologic district: Olympic Domain
Deposit object located: diamond drill holes
Commodities: Cu; Au; U
Mineralization styles: veins; breccia-fillings
Geological ages: Early Mesoproterozoic (host rocks)
Early Mesoproterozoic (mineralization)
Tectonic setting: continental craton; stable; Formal name: Gawler craton (host rocks)
Coincident features: fractures and breccia zones (large magnetite bodies encountered in drilling)
Regional tectonic structure: fracturing and brecciation at the base of Gawler Range volcanisc (volcanics overlie uncoformably over metasiltstone and granites of Kimban orogeny (~1750 Ma)) Tectonic structure name: Gawler Range volcano-plutonic complex
Host rocks: (1) volcanic; felsic volcanic rocks (ash flow tuffs and flows); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: continental; Metamorphic grade: unmetamorphosed
External host rock forms:flows
Host rock stratigraphy:Gawler Range volcanics

(2) intrusive; granite suite (compositional variation to diorite); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: continental; Metamorphic grade: unmetamorphosed
Individual lithologies:potassic granite
Host rock stratigraphy:Burgoyne Batholith/Hiltaba Granite Suite
Related igneous rocks: (1) intrusive; granite suite (Part of the Burgoyne batholith); Initials: Hiltaba granite suite
Individual lithologies:potassic granite
Country rocks: (1) felsic volcanics; (predominant); Country rock name: Gawler Range Volcanics; Metamorphic grade: unmetamorphosed
(2) intermediate volcanics; (subordinate); Country rock name: Gawler Range Volcanics; Metamorphic grade: unmetamorphosed
(3) granite; (subordinate); Country rock name: Burgoyne batholith/Hltaba suitee; Metamorphic grade: unmetamorphosed
(4) siltstone, laminated; (overlain by Gawler Range volcanics); Country rock name: probable equivalent of Wandearah metasiltstone; Metamorphic grade: middle greenschist
(5) granite, foliated; (overlain by Gawler Range volcanics); Country rock name: syn-Kimban orogenic granite; Metamorphic grade: upper greenschist (?)
Metallogenic signatures: Fe
P
Cu
U
Alteration signatures: sericitization: alteration extensive; What was altered: host rocks
chloritization: locally developed , commonly adjacent to magnetite; What was altered: host rocks
hematization: oxidation of primary magnetite, and pervasive halo; What was altered: host rocks and magnetite
Mineralogy: (alteration): sericite, chlorite
(gangue): quartz, siderite, phlogopite
(mineralization): magnetite, hematite, chalcopyrite, pyrite, apatite, uraninite, k-feldspar, fluorite, bornite, rare earth minerals
Radiometric ages: Object dated: Host Rocks(1); Age - Ma: 1,591; +10; -10; Dating method: U-Pb; Concentrate: zircon; Source rock: dacite; Formal name: Gawler Range Volcanics; Event dated: host rock; Interpretive comment: volcanics under Paleozoic cover of Stuart Shelf are coeval with the Gawler Range volcanics; Reference: Creaser, R. A.; Cooper, J. A., 1993: U-Pb Geochronology of Middle Proterozoic Felsic Magmatism Surrounding the Olympic Dam Cu-U-Au-Ag and Moonta Cu-Au-Ag Deposits, South Australia; Economic Geology, Volume 88, p. 186 - 197

Object dated: Host Rocks; Age - Ma: 1,578; +13; -12; Dating method: U-Pb; Concentrate: zircon; Source rock: dacite; Formal name: Gawler Range Volcanics; Event dated: host rock; Interpretive comment: volocanics under Paleozoic cover of Stuart Shelf are coeval with the Gawler Range volcanics; Reference: Mortimer, G. E.; Cooper, J. A.; Paterson, H. L.; Cross, K.; Hudson, G. R. T.; Uppill, R. K., 1988: Zircon U-Pb Dating in the Vicinity of the Olympic Dam Cu-U-Au Deposit, Roxby Downs, South Australia; Economic Geology, Volume 83, p. 694 - 709
References:
Drexel, J. F.; Preiss, W. V.; Parker, A. J., 1993
Geology of South Australia, Volume 1: the Precambrian, South Australia
Government of South Australia, 242 p.

Geological Survey of South Australia, 2001
Stuart Shelf: Geoscientific GIS Dataset
Primary Industries and Resources SA: Mineral Resources, Mineral Exploration and Data Packages,8., CD-ROM

Parker, A. J., 1987
Archean to Middle Proterozoic Mineralization of the Gawler Craton (Including the Stuart Shelf Region), South Australia
DME Rep. Bk. 87 / 84, Geological Survey, Department of Mines and Energy, South Australia, 26 p.

Parker, A. J., 1990
Gawler Craton and Stuart Shelf - Regional Geology and Mineralization
in Geology of the Mineral Deposits of Australia and Papua New Guinea, Edited by Hughes, F. E., Monograph, The Australasian Institute of Mining and Metallurgy, Melbourne, 14, 1828 p, p. 999 - 1008

Paterson, H. L. , 1986
The Acropolis Deposit
in Basement Geology of the Stuart Shelf Region, South Australia; 8th Australian Geological Convention, Adelaide, 1986, Edited by Paterson, H. L., Guidebook, Geological Society of Australia, A1

Paterson, H. L.; Dalgarno, C. R.; Esdale, D. J.; Tonkin, D., 1986
Basement Geology of the Stuart Shelf Region, South Australia
in Olympic Dam/Stuart Shelf, 8th Australian Geological Convention, Excursion Guidebooka1, Edited by Anonymous, Excursion Guidebook, Geological Society of Australia, A1, p. 30


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