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Location: 41 km E from Rouyn-Noranda, Quebec, Canada
10 200, route de PreissacRouyn-NorandaQuebec, CanadaJ0Y 1C0
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Deposit TypeThe Doyon-Bousquet-LaRonde(DBL) mining camp is one of Canada’s largest VMS districts (Mercier-Langevin, Dubé and Blanchet, et al. 2017). The mineralization on the Property has been well documented by various researchers and is recognized as comprised of world-class, gold-rich VMS deposits formed in a submarine back-arc basin or submarine arc crust. Like other VMS-type deposits, the LaRonde Complex’s lenses were formed mainly by sulphide precipitation from hydrothermal fluids on an Archean seafloor and by sulphide replacement in the footwall below the lenses.Two deposits styles are recognized on the Property:• Gold-rich base metal massive sulphide lenses (LaRonde Penna, Bousquet No. 2-Dumagami), which represent the exhalative part of a VMS-type system above the seafloor.• Gold-rich vein stockworks and sulphide disseminations (Bousquet No. 1-LZ5 and Ellison); which represent the sub-seafloor stockwork and replacement-style VMS-type system (feeder zone) into permeable (i.e., fragmental) facies in volcanic rocks such as breccia, volcanic tuff, pyroclastic unit, etc. MineralizationThe LZ5 horizon consists of a four-to-30 metres thick horizon of disseminated to stringer sulphide mineralization containing 5% to 20% pyrite and traces of chalcopyrite with rare millimetre-wide grains of visible gold. The LZ5 horizon has a large geological footprint and has been estimated to contain a mass of more than 26 million tonnes. The LZ5 horizon can be followed over 900 metres of east-west strike length over the Bousquet property and another 400 metres on the Ellison property for a total strike length of 1,300 metres. LZ5 has been traced vertically for almost 1,000 metres showing a steep dip to the southwest. In an enlarged area of LZ5, there is gold enrichment near the margins of the economic envelope. LZ5 includes two high grade portions named Zone 5 Footwall and Zone 5 hanging wall.Mineralized zones at LaRonde Zone 5 (former Bousquet Shaft #1)The gold-bearing zones at LZ5 are lenses or stringers of disseminated through semi-massive, locally massive aggregates of fine to coarse pyrite with traces of pyrrhotite and chalcopyrite. Local traces of different metallic minerals such as sphalerite, galena, bornite, telluride and native gold can be observed. These zones vary in size from 150,000 tonnes up to 26 million tonnes (i.e., the geological and mineralized envelope of Zone 5). The mineralization in the vicinity of LZ5 occurs along five distinct mineralized horizons named Zones 1 to 5 (from south to north). Although the economically mineralized portions of these horizons are restricted to local sulphide-rich lenses, some mineralized horizons can be followed over the Bousquet property.Zone 1 and Zone 2Zones 1 and 2 were mined underground using Bousquet Shaft #1, and they consist of narrow, disseminated stringers to semi-massive sulphide lenses. This vein-type mineralization is composed predominantly of pyrite, with minor chalcopyrite-sphalerite and quartz in felsic host rocks. Zone 1 averages 4 m in width and can be followed over more than 300 m east-west as well as at depth. Zone 2 is considered to be a local secondary horizon of mineralization encountered between Zones 1 and 3, and has similar dimensions to Zone 1.Zone 3FW and Zone 3HWThe Zone 3 horizon is divided into Zone 3FW and Zone 3HW. The ore that has been extracted from gold-rich portions of Zone 3 represents 80% of the tonnes already mined at the Bousquet Shaft #1 (Mercier-Langevin, Hannington, et al. 2011). Zone 3 mineralization has been described as similar to other zones on the Bousquet property (Valliant, Mongeau and Doucet 1982) (Tourigny, et al. 1992). The gold-bearing zone is associated with disseminated stringers through semi-massive, locally massive, aggregates of fine to coarse pyrite with traces of chalcopyrite. The mineralization is hosted by sericitized and sheared andesitic tuff units. Local traces of different metallic minerals such as sphalerite, bornite, rutile, telluride and native gold can be observed.Immediately underlying Zone 3 is a continuous, garnet-bearing horizon associated with hydrothermal alteration below the lens, as observed elsewhere in the DBL mining camp (e.g., at the Westwood mine and in the 20 North lens at the LaRonde Mine). The mined portion of Zone 3 extends over 600 m strike length (east-west) and approximately 600 m vertically. The thickness of the high-grade (above 4 g/t gold) portion of Zone 3 averages approximately 3 to 5 m but has reached up to 15 m where Zone 3FW and Zone 3HW were mined together.Zone 5The Zone 5 lens consists of a 4- to 30-m thick horizon of disseminated to stringer sulphidemineralization containing 5% to 20% pyrite and traces of chalcopyrite with rare millimetre-widegrains of visible gold.The Zone 5 horizon has a very large geological footprint; it has been estimated to have a mass of more than 26 million tonnes and can be followed over 900 m east-west strike length over the Bousquet property, and another 400 m on the Ellison property for a total strike length of 1,300 m. Zone 5 has been traced vertically for almost 1,000 m and it shows a steep dip to the southwest. In an enlarged area of Zone 5, there is gold enrichment near the margins of the economic envelope. Zone 5 includes two higher grade portions named Zone 5 Footwall (5FW) and Zone 5 Hanging wall (5HW).Zone 4 and Zone 41The Zone 4 horizon is located 4 to 10 m stratigraphically above Zone 5 and is very similar to Zone 5 in terms of mineralization and lateral extension. However, Zone 4 is narrow, averaging 2 to 4 m in thickness, and so could be considered a satellite horizon of Zone 5. During the 2010-11 drilling campaign, traces of visible gold were observed mainly in Zone 4. Less than 9,000 short tons (8,200 tonnes) have been extracted by underground mining from Zone 4.Zone 41 refers to a narrow horizon similar to Zone 4, located above Zone 4. This horizon has not been described previously due to its low grade (± 1-2 g/t gold), however, marginally economic material has been mined locally.
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