The Bousquet-LaRonde gold-rich volcanogenic massive sulfide complex, Quebec, Canada: discovery, geology and exploration model

CIM Vancouver 2006
Benoît Dubé, Mark D. Hannington, Guy Gosselin, Benoît Lafrance,
Abstract The first gold occurrences (gold-rich VMS and sulfide-rich Qz veins) of the Bousquet district located in the Archean Blake River Group, Abitibi greenstone belt, were discovered in the 1930’s. Since then, five multi-million ounces mines have been put into production, including three gold-rich VMS deposits plus the newly discovered LaRonde Penna Au-Zn-Ag-Cu giant VMS deposit that was put in production in 2000 by Agnico-Eagle Mines ltd.

The massive sulfide ore lenses (±75 Mt, 14 Moz Au) are associated to various alteration styles and are stacked in a south facing homoclinal volcanic sequence composed of tholeiitic to transitional mafic rocks overlain by a sequence of transitional to calc-alkaline dacitic to rhyolitic domes, cryptodomes and flow breccia deposits cut by high-level mafic sills and dykes. A network of syn-volcanic faults controlled the distribution of volcanic units, ore lenses and metals distribution within the lenses that later sustained deformation and upper greenschist facies metamorphism.

Current exploration in the district is mainly based on predictive geology that relies on a geological model that integrates the key geological and geochemical features of the volcanic sequence and hydrothermal system. This is supported by aggressive deep drilling down to 3000m in the LaRonde Penna mine area.
Keywords: Gold-rich, Bousquet, Laronde, Abitibi, Greenstone, VMS, sulfide, Exploration, Rhyolite, Blake River
Full Access to Technical Paper
PDF version for $20.00
Other papers from CIM Vancouver 2006