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A Group of Papers Devoted to the Laronde Penna Au-Rich Volcanogenic Massive Sulfide Deposit, Eastern Blake River Group, Abitibi Greenstone Belt, Quebec: Preface^*

P. Mercier-Langevin

Geological Survey of Canada, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada, and Institut national de la recherche scientifique–Centre Eau, Terre et Environnement, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada

B. Dubé

Geological Survey of Canada, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada

B. Lafrance

Ministère des Ressources naturelles et de la Faune, 400 Lamaque Blvd., Val-d’Or, QC J9P 3L4, Canada, and Cogitore Resources, 1300 Saguenay Blvd., Rouyn-Noranda, QC J9X 7C3, Canada

M. D. Hannington

University of Ottawa, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada

A. Galley

Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

R. Marquis and J. Moorhead

Ministère des Ressources naturelles et de la Faune, 400 Lamaque Blvd., Val-d’Or, QC J9P 3L4, Canada

D. W. Davis

Department of Geology, Earth Sciences Centre, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada

Corresponding author: e-mail, pmercier@nrcan.gc.ca

The first 20% of the full text of this article appears below.

Gold-rich volcanogenic massive sulfide (VMS) deposits are a subgroup of lode gold deposits, as defined by Poulsen et al. (2000). They are commonly defined by an average gold grade in grams per tonne greater than that of the combined base metals in weight percent (Au g/t > Cu + Zn + Pb wt percent: Poulsen et al., 2000). Five of the largest and best examples of Au-rich VMS deposits currently recognized in the world are located in the Blake River Group in the Abitibi greenstone belt, Quebec, Canada. The Horne (54.3 Mt at 6.1 g/t Au, 11.7 Moz Au) and Quemont (13.9 Mt at 4.7 g/t Au, 2.3 Moz Au) deposits occur in the Noranda camp (Fig. 1), and the LaRonde Penna (59 Mt at 4.3 g/t Au, 8.1 Moz Au), Bousquet 2-Dumagami (15.5 Mt at 7.2 g/t Au, 3.6 Moz Au) and Bousquet 1 (7.5 Mt at 5.3 g/t Au, 1.3 Moz Au) deposits occur in the Doyon-Bousquet-LaRonde mining camp (Table 1), 45 km east of Noranda (Fig. 1).

View larger version (67K):   FIG. 1. Geologic map of the Bousquet Formation in the Doyon-Bouquet-LaRonde mining camp area. This map is a synthesis of the Doyon-Bousquet-LaRonde mining camp and shows the location of the Au-rich VMS deposits (current and past producers) and main occurrences and the location of the intrusion-related Au-Cu vein systems (current and past producers) and main occurrences at surface. Adapted from Lafrance et al. (2003a, b, c). U-Pb ages from Lafrance et al. (2003a; 2005) and from Mercier-Langevin et al. (2004; 2007a).

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