Mount Morgan gold-copper deposit: The 1992 perspective

Golding S.D., Huston D.L., Dean J.A., Messenger P.R., Jones I.W.O., Taube A. and White A.H. (1993). Mount Morgan gold-copper deposit: The 1992 perspective. In: Proceedings of the AusIMM Centenary Conference - 1893-1993, Adelaide, Aust, (95-111). March 30, 1993-April 4, 1993.

Author Golding S.D.
Huston D.L.
Dean J.A.
Messenger P.R.
Jones I.W.O.
Taube A.
White A.H.
Title of paper Mount Morgan gold-copper deposit: The 1992 perspective
Conference name Proceedings of the AusIMM Centenary Conference - 1893-1993
Conference location Adelaide, Aust
Conference dates March 30, 1993-April 4, 1993
Journal name Conference Series - Australasian Institute of Mining & Metallurgy
Series Conference Series - Australasian Institute of Mining & Metallurgy
Publisher Publ by Australasian Inst of Mining & Metallurgy
Publication Year 1993
Sub-type Fully published paper
Open Access Status Not yet assessed
ISBN 0949106798
ISSN 0728-7178
Start page 95
End page 111
Total pages 17
Language eng
Abstract/Summary The 50 million tonne Mount Morgan gold-copper deposit (4.99 g/t Au, 0.72 per cent Cu) was an irregular pipe-like body of quartz and pyrite, with subordinate chalcopyrite, magnetite and gold. Mineralization was hosted by the Middle Devonian Mine Corridor Volcanics which occur as a roof pendant within the Late Devonian Mount Morgan Tonalite. On three sides, the deposit was enclosed by a series of normal, concave, listric faults and surrounded by outward-dipping Mine Corridor Volcanics. The tonalite which bounded the western side of the deposit transgresses the domal structure with no apparent interference. A pipe of intense, texturally-destructive, quartz-sericite-chlorite±pyrite underlay and partly surrounded the deposit. The volcanic setting of the deposit, its shape, metal content and associated footwall alteration are consistent with a subsea-floor replacement origin for the gold-copper mineralization. Mineralogical studies have confirmed the deposit has been recrystallized and annealed by a thermal metamorphic event, most likely the intrusion of the Mount Morgan Tonalite. Pyrrhotite Pipe mineralization replaces annealed massive pyrite, suggesting that it formed during retrogressive metasomatism associated with tonalite emplacement. Telluride minerals have a close association with chalcopyrite, and no evidence for a late telluride paragenetic stage was observed. Telluride mineralization is inferred to be genetically related to the massive sulphide mineralization, and a separate magmatogenic origin for this mineralization is discounted. Lead, oxygen, carbon and sulphur isotope systematics indicate that fluid components were derived both from seawater and magmatic sources; however, these data are as yet insufficient to determine whether the magmatic components were leached from the volcanic rocks or input directly from a crystallizing subvolcanic magma chamber.
Subjects 1909 Geotechnical Engineering and Engineering Geology
2101 Archaeology
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Conference Paper
Sub-type: Fully published paper
Collection: Scopus Import - Archived
 
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Created: Tue, 12 Jul 2016, 12:59:29 EST by System User