Quebec, Canada

Main commodities: Cu Au
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The Horne volcanogenic massive sulphide deposit was located in Rouyn-Noranda, Quebec, Canada.   It was the largest of 22 deposits of this type to be discovered in the Rouyn-Noranda district.

The Horne deposit lies within felsic volcanics of the Archaean Blake River Group where they occur as a narrow wedge between the Andesite and Horne Creek Faults in the southern part of the Rouyn-Noranda district.   In the central and western sections of the mine both the volcanic hosts and the massive sulphides strike east west, dip vertically and face north.

The host felsic volcanics of the Mine Rhyolite are a series of aphyric to quartz plagioclase (albitic) porphyritic flows, breccias and tuffs that form both the hangingwall and footwall to the massive sulphides, and are sandwiched between the Andesite and Horne Creek Faults.   Individual volcanic units could not generally be correlated between drill holes.   A gabbro-diorite mass intrudes the sequence in the hangingwall and also cuts the massive sulphides of the orebody.   Further in the hangingwall, north of the Horne Creek Fault there are more massive rhyolites, while south of the Andesite Fault the country rock is predominantly andesite.

The volcanics between the two faults have all been subjected to hydrothermal alteration.   The main alteration minerals are quartz, sericite and chlorite with lesser albite, epidote, calcite and pyrite.   Over 90% of the alteration is quartz-sericite, although less extensive volumes of chlorite are found in the immediate vicinity of the massive sulphides.   A network of gold bearing chlorite veinlets are superimposed on the quartz-sericite in both the hangingwalll and footwall to the main massive sulphides.

Historic production from discovery in 1923 to closure in 1976 was - 60 Mt @ 2.2% Cu, 5.2 g/t Au

For more detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1990.    
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.

  References & Additional Information
   Selected References:
Kerr D J, Gibson H L  1993 - A comparison of the Horne volcanogenic massive Sulfide deposit and intracauldron deposits of the mine sequence, Noranda, Quebec: in    Econ. Geol.   v88 pp 1419-1442
MacLean W H, Hoy L D  1991 - Geochemistry of hydrothermally altered rocks of the Horne Mine, Noranda, Quebec: in    Econ. Geol.   v86 pp 506-528
Taylor B E, de Kemp E, Grunsky E, Martin L, Maxwell G, Rigg D, Goutier J, Lauziere K and Dube B,  2014 - Three-Dimensional Visualization of the Archean Horne and Quemont Au-Bearing Volcanogenic Massive Sulfide Hydrothermal Systems, Blake River Group, Quebec : in    Econ. Geol.   v.109 pp. 183-203

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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