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Kerr Addison, Chesterfield, Cheminis |
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Ontario, Canada |
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Au
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Super Porphyry Cu and Au
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The Kerr Addison & Chesterfield gold mines are located in the Kirkland Lake-Larder Lake segment of the Archaean Abitibi greenstone belt in eastern Ontario, Canada.
Kerr Addison was the most prominent gold producer in the Kirkland Lake district having yielded 340 tonnes of Au to 2000.
Mineralisation is hosted by komatiitic and tholeiitic mafic and ultramafic volcanics and flows of the 2705 Ma Larder Lake Group adjacent to their structural contact with the unconformably overlying 2677 to 2680 Ma Timiskaming Group conglomerate, wacke, arkose and tuff. The hosts are in turn intruded by a series of pre and post ore diorite dykes in the mine area.
The ore deposits exploited by the Kerr Addison, Cheminis & Chesterfield mines are located in a zone of talc-carbonate and chlorite-carbonate rocks. Both the volcanic and sedimentary hosts are affected by upright east to north-east trending regional folds, specifically a tight asymmetric synform truncated by the Larder Lake-Cadillac Fault. The Kerr Addison mineralisation is on the locally overturned south limb of this synform, within anastomosing schist zones on the southern margin of the Larder Lake-Cadillac Fault zone.
There are two principal types of ore, (1) carbonate ore composed of green Cr muscovite bearing quartz-carbonate stockwork veins carrying free gold within a zone of carbonatised ultramafics, and (2) flow ore which occurs as zones of finely disseminated pyrite (with associated gold) in carbonatised and albitised tholeiitic basalt with graphite, and in albitised mafic dykes.
On a district scale alteration is characterised by carbonates, with fuchsite-iron carbonate on the mine scale, and carbonate-albite-pyrite vein selvages.
For more detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2000.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Kishida A, Kerrich R 1987 - Hydrothermal alteration zoning and Gold concentration at the Kerr-Addison Archean lode Gold deposit, Kirkland Lake, Ontario: in Econ. Geol. v82 pp 649-690
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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