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Location: 1 km E from Val-d'Or, Quebec, Canada
1000, route de Service Goldex-ManitouVal-d'OrQuebec, CanadaJ9P 0M6
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The Lamaque Complex area is underlain by volcanic rocks of the Malartic Group and mafic to intermediate intrusions that range in age from syn-volcanic to syn to late tectonic and rare diabase dikes of Proterozoic age.Gold Mineralization The majority of gold in the Lamaque Complex area is hosted by quartz-tourmaline-carbonate veins, which vary from shear hosted and/or extensional vein systems to complex stockworks zones.Triangle Mine The Triangle deposit was discovered in 2011 by drilling an isolated circular magnetic high feature south of the Sigma mine and Lamaque mine. The magnetic feature is now interpreted to correspond to the contact aureole and/or altered zone within the mafic volcaniclastic rocks surrounding a non-magnetic porphyritic diorite intrusion (Triangle Plug) and extends over a subcircular area roughly 800 m in diameter.Gold mineralization in the Triangle deposit occurs primarily within quartz-tourmaline-carbonate-pyrite veins in the Triangle Plug and adjacent massive mafic lapilli-blocks tuffs. The veins are localized in a series of shear zones and fractures that cut both units. The thickest and most continuous veins have an east-west strike and developed within ductile-brittle reverse shear zones that dip 50° to 70° to the south. They are classified as Cveins (shear veins) and at least thirteen discrete C-veins (C1 to C11 and C8b and C9b) have been identified to a depth of greater than 1,500 m.Plug No. 4 Deposit The Plug No. 4 deposit is located 550 m north of the Triangle deposit and 1 km southwest of the historical No. 3 Mine shaft, to which it is connected by drifts on the 450 and 700 levels. Plug No. 4 is a fine- to mediumgrained magnetic gabbro intrusion measuring roughly 100 to 150 m in diameter. It is enveloped by an older syn-volcanic diorite and diorite breccia similar to the C-porphyry. These intrusions are cut to the west by a fine-grained porphyritic felsic diorite dyke which extends northwest towards the No. 3 Mine area. Gold mineralization at Plug No. 4 is restricted to the gabbro intrusion.Parallel Deposit The Parallel deposit is located 650 m northwest of the No. 3 Mine and 900 m east-southeast of Lamaque Mine main shaft. Gold mineralization at the Parallel deposit is hosted within fine- to medium-grained Cporphyry diorite. The diorite is medium greenish-gray and contains 1 to 5% disseminated pyrite commonly in a chlorite-silica pervasive alteration. The ore zones at the Parallel deposit occur as sub-horizontal extension veins at shallow depths (70 m to 200 m) and as east-west striking shear veins dipping approximately 30° south at deeper levels. The mineralized veins consist of quartz and carbonate with lesser amounts of tourmaline, chlorite, and sericite.Ormaque Deposit The Ormaque deposit is located immediately east of the Parallel deposit, approximately midway between the historic Sigma mine and the currently producing Triangle mine. The Ormaque vein system occurs within the C-porphyry at the contact with volcaniclastic rocks to the north. Gold mineralization occurs dominantly in gently south-dipping quartz-tourmaline-carbonate extension veins and localized breccia zones. A characteristic feature of the Ormaque deposit is the intense tourmaline-pyrite alteration selvages that surround the extensions veins.Orogenic Gold Deposits Classic case studies of gold deposits in the Val d’Or district have contributed to the definition of the orogenic gold deposit type.Structural Setting: Orogenic gold deposits are typically distributed along first-order compressional to transpressional crustal-scale fault zones that mark the convergent margins between major lithological and/or tectonic boundaries (e.g., Larder Lake–Cadillac Fault Zone). These major regional structures display evidence for being long-lived faults with multiple episodes of movement and deformation.Metamorphism: Most major orogenic gold systems formed in and around the brittle-ductile transition which typically coincides with greenschist facies metamorphic conditions (2 to 3 kbar and 300 to 400ºC).Host Rocks: Although most orogenic gold deposits in Archean terranes are hosted in greenstone belts, in detail the immediate host rocks are variable and focus mineralization as a function of competency contrast and/or chemical trap. The latter include banded iron formations, iron-rich basalts, and carbon-rich rocks, however, in the Lamaque Project area competency contrasts are the most important localizing host rock control.Vein Mineralogy and Texture: Orogenic gold deposits develop in response to shear failure, extensional failure and/or hybrid extensional shear failure. The former form shear veins that are commonly vertical to steeply dipping, have laminated to foliated internal vein textures and irregular, deformed margins that are sub-parallel to parallel to the host shear zones. In extensional failure, extension veins develop which have shallow dips, parallel planar walls, and open-space infill textures. They commonly form stacked vein arrays or isolated tabular veins. They have a complex relationship with shear veins and shear zones. In some cases, they propagate off shear veins and/or nucleate on earlier formed shear zones.
