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GEOREF RECORD

The Scadding gold mine, east of the Sudbury igneous complex, Ontario; an OICG-type deposit?

Eva S. Schandl and Michael P. Gorton
The Scadding gold mine, east of the Sudbury igneous complex, Ontario; an OICG-type deposit?
The Canadian Mineralogist (December 2007) 45 (6): 1415-1441

Abstract

The Scadding mine is only one of several small gold deposits and prospects in the regionally albitized Huronian metasedimentary rocks of the Sudbury-Wanapitei Lake area of Ontario. The locally brecciated, albitized and chloritized metasedimentary rocks that host the Scadding gold deposit have elevated Co, Cu, Ni, Fe, As and REE concentrations, and locally contain a wide variety of REE-rich minerals. Gold occurs as inclusions in pyrite, chalcopyrite and in chlorite. Fluid-inclusion data obtained from mineralized quartz veins indicate that gold was deposited from highly saline hydrothermal fluids (36-38 wt% NaCl) having a temperature range of 340-390 degrees C. These fluid inclusions coexist with other, less abundant primary fluid inclusions of low salinity and comparable temperature. The lack of evidence for phase separation in the saline and dilute inclusions suggests the mixing of brines with dilute meteoric or metamorphic fluids as the possible mechanism for gold precipitation. We propose that Scadding is a modified iron oxide - copper - gold (IOCG) deposit in which Fe sulfides dominate over Fe oxides. Fluctuating Cl/S values in the hydrothermal fluids could explain the relative enrichment of the rocks in pyrite with respect to Ti-poor magnetite and hematite, both of which occur in the chlorite-rich (pyrite-poor) assemblages.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 45
Serial Issue: 6
Title: The Scadding gold mine, east of the Sudbury igneous complex, Ontario; an OICG-type deposit?
Affiliation: University of Toronto, Department of Geology, Toronto, ON, Canada
Pages: 1415-1441
Published: 200712
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 58
Accession Number: 2008-068231
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch map
N46°15'00" - N47°00'00", W81°34'60" - W80°34'60"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200817
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