Red Lake District - Goldcorp, Campbell

Ontario, Canada

Main commodities: Au
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The Goldcorp and Campbell Red Lake mines are located within the north-eastern part of the Red Lake Greenstone Belt, which is in turn part of the Uchi Sub-province and the greater Superior Province (#Location: 51° 3' 44"N, 93° 44' 44"W).

The Red Lake district is some 600 km NW of the Hemlo mines and 1000 km to the NW of the Abitibi Belt. Mineralisation is hosted within a sequence of 2989±3 Ma Fe-tholeiites, to the west of the nearby folded contact with an overlying suite of younger chemical and clastic sediments. The deposit is centred on a NW trending corridor of regional silicification and carbonatisation that is enriched in As, Sb and Au. This corridor is in part coincident with a zone of pre-ore penetrative foliation that dips at 65 degrees SW, has a NW raking elongation lineation and over-prints both the tholeiites and younger sediments. A north-south trending, west dipping gradational isograd boundary between greenschist and amphibolite facies metamorphism is close to the ore zone.

The ore mineralisation is confined largely to two major structures that parallel foliation over a 2 km strike length. The ore has been sub-divided into four main types which maintain consistent temporal relationships, as follows:
  i). the earliest and most abundant are carbonate-quartz veins, overprinted by,
  ii). quartz-arsenopyrite-native gold veins and replacement zones,
  iii). silica-sulphide replacement bodies, and
  iv). sheeted veinlet zones
Zoning occurs across the two adjacent mines on several scales. Vein-type ores are more abundant in the NW and upper parts, while replacement ores are more common to the SE.

As of 12 September, 2001, reserves and resources at Goldcorp's Red Lake operation were:
    Proved+probable reserve - 135 t (4.3 Moz) of Au, comprising 3.30 Mt @ 40.7 g/t Au (1.33 oz/t), with
    Resources of an additional 44 t (1.42 Moz) Au, contributed by 0.90 Mt @ 49 g/t (1.6 oz/t) Au.
  The reserves include a high grade zone of
    1.902 Mt @ 61.8 g/t (2.02 oz/t) Au, and a sulphide zone of 1.40 Mt @ 11.9 g/t (0.39 oz/t) Au.
  In the first nine months of operation total operating cost was under USD 100 per oz, while cash cost was around USD 60 per oz. Metallurgical recovery has been around 88%.

The reserves at the Placer Dome Campbell Red Lake mine as of 1999 were:
    4.04 Mt @ 14.5 g/t Au (0.47 oz/t) Au.

The most recent source geological information used to prepare this summary was dated: 2001.    
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.

Red Lake

  References & Additional Information
   Selected References:
Chi, G., Dube, B., Williamson, K. and Williams-Jones, A.E.,  2006 - Formation of the Campbell-Red Lake gold deposit by H2O-poor, CO2-dominated fluids: in    Mineralium Deposita   v40 pp 726-741
Dube B, Williamson K, McNicoll V, Malo M, Skulski T, Twomey T, Sanborn-Barrie M  2004 - Timing of Gold Mineralization at Red Lake, Northwestern Ontario, Canada: New Constraints from U-Pb Geochronology at the Goldcorp High-Grade Zone, Red Lake Mine and at the Madsen Mine: in    Econ. Geol.   v99 pp. 1611-1641
Gallagher, S., Camacho, A., Fayek, M., Epp, M., Spell, T.L. and Armstrong, R.,  2018 - Geology, geochemistry, and geochronology of the East Bay gold trend, Red Lake, Ontario, Canada: in    Mineralium Deposita   v.53, pp. 127-141.
Penczak R S, Mason R  1999 - Characteristics and origin of Archean premetamorphic hydrothermal alteration at the Campbell Gold Mine, Northwestern Ontario, Canada: in    Econ. Geol.   v94 pp 507-528
Penczak R S, Mason R  1997 - Metamorphosed Archean epithermal Au-As-Sb-Zn-(Hg) vein mineralization at the Campbell Mine, Northwestern Ontario: in    Econ. Geol.   v92 pp 696-719

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 takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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