THE GEOLOGY OF THE ANSIL DEPOSIT, ROUYN-NORANDA, QUEBEC

The Ansil deposit is located in the Noranda mining camp in the southern part of the Abitibi greenstone belt. It was discovered in 1981 and production began in 1989 with proven reserves of 1.58 Mt grading 7.2% copper, 0.9% zinc, 26.5 glt of silver and 1.6 glt of gold. It is centered at a depth of 1.3 kilometre and represents one of the deepest ore discoveries ever made from surface.
The deposit consists of a single massive sulphide lens located at the contact between the Northwest Rhyolite and the Rusty Ridge Andesite. The lens strikes north-south and dips 50° east. The thickness of the lens may reach up to 35 m and can change very abruptly both along strike and along dip. The maximum thicknesses of the sulphide lens are reached in its upper (western) and at its lower (eastern) edges, thus giving the deposit its present shape of two sulphide domes connected by a thinner central portion. The lower dome is underlain by a thick accumulation of massive magnetite which may reach 10 to 15m in thickness. The upper and lower domes are underlain by two distinct pipe-shaped zones of stringer and disseminated sulphides which merge with a larger stringer zone at depth.
The Ansil deposit displays strong relationships between its morphology and the distribution of metals. Hydrothermal alteration consists of chloritization and sericitization. Chlorite alteration is closely associated with stringer sulphide mineralization while sericite is developed in diffuse zones bordering the chloritic zones. Unlike other similar deposits, the Ansil deposit is characterized by very extensive alteration and sulphide mineralization in the hangingwall of the massive sulphides. Several features of the deposit are consistent with an origin from a submarine hydrothermal system which was particularly long-lived, and which thus promoted the build-up of very high fluid temperatures with extensive replacement (and enrichment) of pre-existing sulphides after their original deposition onto the seafloor.

Le gisement Ansil se trouve au centre du camp minier de Noranda, lui-meme localise dans la partie sud de la ceinture de l'Abitibi. Decouvert en 1981, il a ete mis en production en juillet 1989 alors que les reserves prouvees s' elevaient a 1.58 Mt a 7.2% de cuivre, 0.9% de zinc, 26.5 glt d' argent et 1.6 glt d' or. Le coeur de ce gisement est situe a 1 300m de profondeur et sa decouverte est l'une des plus profondes jamais faites a partir de la surface.
Le gisement Ansi/ comprend une seule lentille de sulfures massifs localisee au contact de Ia rhyolite Northwest et de l'andesite Rusty Ridge. Cette lentille, orientee nord-sud et inclinee de 50° vers l'est, montre une epaisseur pouvant atteindre 30m, qui peutvarier brutalement
le long de la direction et enpendage. Les epaisseurs maximales se retrouvent aux deux extremites ( superieure et inferieure) de la lentille,lui confer ant une forme bilobee a deux domes separes par une zone midiane plus mince. Le dome de la partie inferieure est caracterise par une epaisse accumulation de magnetite massive, sous-jacente aux sulfures, pouvant atteindre 10 a 15 m d'epaisseur.
Le gisement Ansil montre une relation directe entre sa morphologie et la distribution des metaux. L'alteration hydrothermale associee au gisement consiste principalement en chloritisation et serecitisation. La chlorite est intimement liee aux zones riches en veinules de sulfures, situees de part et d' autre des sulfures massifs.La sericite se retrouve dans des zones diffuses qui enveloppent les zones chlorite uses. Contrairement aux autres gisements de Ia region, celui d'Ansil est caracterise par la presence, au-dessus des sulfures massifs, d' une grande quantite de sulfures dissemines et de roches alterees. Plusieurs caracteristiques presentees par ce gisement confortent l'hypothese de sa mise en place a partir d'un systeme hydrothermal sous-marin fonctionnant sur une longue periode et permettant, ainsi, Ia formation de fluides a haute temperature qui vont favoriser le remplacement et l'enrichissement des sulfures apres leur accumulation sur le fond marin.
Keywords: Ansil deposit, Noranda Mining Group, Rouyn-Noranda, Abitibi gemstone belt, Lens, metal distribution, Gisement Ansil, Camp Minier Noranda, Ceinture de l'Abitibi, Lentille, Distribution des metaux.
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Publication: Special Volume
Author(s): Pierre Pilote, Jayanta Guha, Real Daigneault: Universite du Quebec a Chicoutimi, 555 boul. Universite, Chicoutimi, Quebec; Francois Robert: Geological Survey of Canada, 601 Booth St., Ottawa, Ontario; Jean-Yves Cloutier: Les Mines Casa-Berardi, 21A Seme ave. Est, La Sarre, Quebec; J. Paul Golightly: Inco Gold, J. Roy Gordon Research Laboratory, Sheridan Park, Mississauga, Ontario
Keywords: Casa-Berardi East deposit, Casa-Berardi Center deposit, Casa-Berardi West deposit, Casa-Berardi fault, Casa-Berardi deformation zone, Quartz vein, Gisements Casa-Berardi Est, Gisements Casa-Berardi Centre, Gisements Casa-Berardi Ouest, La faille de Casa-Berardi, Couloir de Casa-Berardi, Veines de quartz
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Sylvain Lacroix: Ministere de l'Energie et des Ressources, Service Geologique du Nord-Ouest, 19 Perreault 0., Suite 330, Rouyn-Noranda, P.Q.; Alain Simard, Pierre Pilote: Ministere de l'Energie et des Ressources, Service Geologique du Nord-Ouest, 400 boul. Lamaque, Val d 'Or, P.Q.; Louis-Martin Dube: Ecole Polytechnique (Universite de Montreal), Departement de Genie Mineral, C.P. 6079, Succ. "A", Montreal, P.Q.
Keywords: Harricana-Turgeon belt, HTB, Volcanic rocks, Volcano-sedimentary units, Sillon Harricana-Turgeon, SHT, Roches volcaniques, Unites volcanosedimentaires
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Robert Sansfacon: Minerais LAC Limitee,(Division Exploration Quebec), Malartic;
Claude Hubert: Departement de geologie, Universite de Montreal, Montreal
Keywords: Malartic gold, Gold, Fault, Or Malartic, Or, Faille
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Jean-Marc Simard et Richard Genest: Mines Agnico Eagle Itee, C.P. 310, Joute1 (Quebec)
Keywords: La mine Agnico-Eagle, Complexe volcanique, Tufts felsiques, Argilite et sediments chimiques, Argilites carbonatees, Agnico-Eagle deposit, volcanic complex, Felsic tuffs, Argillites and chemical sediments, carbonatized argillites
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Mathieu Piche, Jayanta Guha et Real Daigneault: Sciences de la terre / Centre d'Etudes sur les Ressources Minerales, Universite du Quebec a Chicoutimi, Chicoutimi, Quebec; John R. Sullivan: Explorations Noranda ltee, Rouyn-Noranda; Gilles Bouchard: Explorations Noranda ltee, Matagami
Keywords: Stratisgraphie, Camp minier Matagami, Gisements de sulfures massifs volcanogenes, Roches volcaniques, Gites de sulfures, Stratigraphic sequence, Matagami mining camp, Volcanogenic massive sulphide, Volcanic rocks
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Michel Boily, Anthony E. Williams-Jones and T. Mulja: IREM-MERI and Department of Geological Sciences, McGill University, 3450 University Street, Montreal, Canada; Pierre Pilote: Ministere de l'Energie et Ressources, Service Geologique du Nord Ouest, 400 Boul Lamaque, Val D'Or, Quebec, Canada
Keywords: Preissac-Lacorne batholith, Biotite, Biotite+muscovite monzogranites, Pluton, Le batholite de Preissac-Lacorne, Monzogranites a biotite, Monzogranites a biotite muscovite
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): LanVu: Belmoral Mines Ltd, Val d'Or, Quebec.
Keywords: Ferderber Gold Deposit, quartz, carbonates, tourmaline, micas, Gisement Ferderber
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Michel Richard, Claude Hubert: Departement de Geologie, Universite de Montreal, C.P. 6128, Succ. A., Montreal, Quebec; Alex C. Brown: Departement de Genie Mineral, Ecole Polytechnique, C.P. fiJ79, Succ. A., Montreal, Quebec; and Rejean Sirois: Cambior Inc., Mine Pierre Beauchemin, C.P. 510, Evain, Quebec,
Keywords: Gold deposit, Pierre Beauchemin Gold deposit, meta-trondhjemite, meta-tonalite, hybrid rocks, meta-diorite, Gisement d'or, Mine Pierre Beauchemin,trondhjemite, tonalite, facies hybride, diorite
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Gerald Riverln, Daniel Bernard and Bernard Boily, Minnova Inc., Exploration Division, C.P. 2000, Rouyn-Noranda, Quebec,
Keywords: Donalda gold deposit, Rouyn-Noranda, Horne Creek, HCF, Gisement Aurifere Donalda
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Harold L. Gibson and David H. Watkinson, Falconbridge Ltd., Falconbridge Ont. and
Department of Earth Sciences, Carleton University, Ottawa-Carleton Geoscience Centre, Ottawa.
Keywords: Deposits, Volcanogenic massive sulphide deposits, Noranda, Depots, Depots de sulphure massifs volcanigenes.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Lawrence D. Hoy, Pierre Trudel, Ghislaln Tourigny, Lao Kheang: Mineral Exploration Research Institute, C.P. 6079, Succursale A, Montreal, Quebec; Armand Savoie: La Mine Doyon, C.P. 970, Rouyn, Quebec; and Robert Crepeau: Minerais Lac Ltee., Division Mine Bousquet, C.P. 1180, Malartic, Quebec
Keywords: Fluid inclusion, Stable isotopic studies, Vein forming fluids, Inclusions fluides, Isotopes stables, Formation des veines steriles
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Armand Savoie,: La Mine Doyon, case postale 970, Rouyn-Noranda, Qc; Pierre Trudel, Pierre Sauve et Guy Perrault: IREM-MERI, Campus de l'Universite de Montreal, C.P. 6079, succursale "A", Montreal, Qc,
Keywords: Mine Doyon, Or, Quartz-pyrite, Chalcopyrite, Schistes a sericite, Roches volcaniclastiques de composition felsique, Roches intrusives, Pluton, Gold, Sericitic schist, Volcaniclastic rocks, Intrusive rocks, Pluton
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Pascal Marquis, Claude Hubert: Departement de Geologie, Universite de Montreal, C.P. 6128, Succ. A, Montreal, Quebec; Alex C. Brown: Departement de Genie Mineral, Ecole Polyteclmique, C.P. fiJ79, Succ. A., Montreal, Quebec; D.M. Rigg: Mines Agnico-Eagle Limitee, 761 de la Mine Goldex, C.P. 87, Val d'Or, Quebec
Keywords: Bousquet mining district, Gold deposits, Pyritic schists, Felsic and mafic volcanic, Volcaniclastic protoliths,camp minier de Bousquet, Gisements auriferes, Schistes pyriteux, Protolithes mafiques ou felslques, Volcanique et Volcanoclastique.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Stephane Faure, Michel Jebrak: Universite du Quebec a Montreal, Departement des Sciences de la Terre, C.P. 8888, succ.A, Montreal; Jean-Jacques Bouillon: Les Mines Selbaie, C.P. 370, Joutel
Keywords: Gisement polymetallique, Mines Selbaie, Pyroclastites felsiques, Felsic pyroclastic sequence, Selbaie Mines, Mineralized
veins
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Real Tanguay, Jacques Carignan, Mathieu Piche: Sciences de la Terre/Centre d'Etudes en Ressources Minerales, UQAC, Chicoutimi, Quebec; Charles Beaudry: Explorations Noranda Ltee, Matagam; Andre Bonenfant: Mineraux Noranda Inc, Division Matagami
Keywords: Gisement Isle-Dieu, Tuffite Clef, sulfures massifs, Lentille, lsle-Dieu massive sulphide deposit, Key Tuffite, Massive sulphide, Lens
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Andre C. Tessier: Department of Geological Sciences, Queen's University, Kingston, Ontario; Pierre Trudel: Institut de Recherche en Exploration Minerale, C.P. 6CJ79, Succursale A, Montreal, Quebec; Laszlo lmreh: Ministere de l'Energie et des Ressources du Quebec, 1620, Boulevard de l'Entente, Quebec, Quebec
Keywords: Siscoe gold mine, Val d'Or, K zone, Leaching, Mine d'or Siscoe, Zone K, Lessivage
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Michel Rocheleau, Rejean Hebert, Pierre St-Julien, M. Racine: Departement de Geologie, Universite Laval, Quebec; Roch Gaudreau: Les Mines Selbaie, C.P. 370, Joutel, (Quebec); Pierre Lacoste: Le Centre de recherches minerales, 2700 rue Einstein, Sainte-Foy, (Quebec)
Keywords: Volcano-sedimentaire, Ceinture de l'Abitibi,Domaine d'Assup, Domaine Garden Island, Domaine Val-d' Or, Domaine Trivio, Domaine Villebon.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Francois Robert: Geological Survey of Canada, 601 Booth St., Ottawa, Canada; Rex Brommecker: Dept. of Earth Sciences, University of Waterloo, Waterloo, Ontario
Don S. Bubar: Aur Resources Inc, 1876 3e Avenue, Val d'Or, Quebec
Keywords: Orenada Zone 4 deposit, talc-chlorite-carbonate, chlorite-carbonate, sericite-chlorite, schist, ultramafic volcanic rocks, mafic igneous rocks, intermediate to felsic volcaniclastic rocks, Gisement Orenada Zone 4, schistes a talc chlorite-carbonate,schistes a chlorite-carbonate, schistes sericite-chlorite, roches volcaniques ultramafiques, roches intrusives mafiques
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Pierre Sauve: Institut de recherche en exploration minerale, Ecole Polytechnique de Montreal and Alex Makila: Mine Camflo, Societe minicre Barrick (Canada) Inc.
Keywords: Geology, Camflo Mine, Malartic, Porphyry ore, fault zone ore, Gold, Geologie, Mine Camflo, minerai de, porphyre, minerai de zones de failles, Or
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Nicole Gauthier, Michel Rocheleau; Universite Laval, Departement de Geologie, Pavilion Pouliot, Cite Universitaire. Daniel Kelly and Yves Gagnon
Geospex Sciences Inc. Rouyn-Noranda
Keywords: Tectonic zone, Ore zones, Mineralization, Carbonate ore, Flow ore, Zone tectonique, Corps mineralise.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Sylvain Picard, Mines Silidor Inc., Chemin Don Rouyn, C.P. 2218, Rouyn-Noranda
Keywords: Gisement Silidor, Rouyn-Noranda, Tonalite, Dyke mafique, Breche carbonate, Veine de quartz
Issue: 1990
Volume: SV 43
Year: 1990
Text
Publication: Special Volume
Author(s): Carl Caumartin, Mobrun Mine-Audrey Resources Inc., C.P. 1026, Rouyn-Noranda, Quebec; Marie-France Caille, Audrey Resources Inc., 70, avenue du Lac, Rouyn-Noranda, Quebec
Keywords: Volcanic stratisgraphy, Mobrun, lens, Hydrothermal activity, Stratisgraphie volcanique, Lentilles, Activite hydrothermale
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: From 1927 to 1989, the Horne mine produced 53.7 Mt of ore grading 6.1 glt Au and 2.2% Cufrom two large volcanogenic massive sulphide deposits composed primarily of pyrrhotite, pyrite and chalcopyrite. The orebodies were hosted by a package of chlorite-sericite altered epiclastic rhyolite tuffs which were deposited in a narrow palaeo-graben located on the flank of a major felsic volcanic centre. Mineralizingfluids percolated upward through the permeable footwall rocks and were further focussed...
Publication: Special Volume
Author(s): David J, Kerr and Robert Mason, Department of Geological Sciences, Queen's University, Kingston, Ont., Canada
Keywords: Horne Mine, Mineralization, Ore deposits,Rouyn-Noranda, Mine Horne
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Mine Gallen is a zinc-rich pyritic volcanogenic massive sulphide deposit that occurs in a fault-bounded block of intermediate volcanic rocks. The block is completely surrounded at the present erosion level by the eastern part of the Lac Dufault granodiorite. The volcanic succession includes a massive feldspar porphyry that is probably a subvolcanic intrusion, an andesitic flow unit and lapilli tuffs. The latter are variably sericitized and pyritic, especially in the vicinity of the massive...
Publication: Special Volume
Author(s): David H. Watkinson, John McEwen and Ian R. Jonasson
Department of Earth Sciences, Carleton University, Ottawa-Carleton Geoscience Centre, Ottawa
Keywords: Geology, Mine Gallen, Noranda, Massive sulphide mound, Subvolcanic intrusion, Geologie, Sulphures massifs, Massif sub-volcanique
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Archean Blake River Group is best known from a central volcanic complex in Rouyn-Noranda. This volcano-tectonic depression, delimited by the Hunter Creek fault to the north and the Horne Creek fault to the south, is interpreted to be a cauldron approximately 20 km in diameter. Its western and eastern boundaries are the Flavrian Plutonand the D'Alembert shear zone respectively. The complex has an exposed stratigraphic thickness of 10.5 km. Two cycles, composed of andesitic units overlain...
Publication: Special Volume
Author(s): A. Shirley Peloquin, Unite de Recherche et de Service en Technologie Minerale, Rouyn-Noranda, Quebec; Robin Potvin, Cambior Exploration, Destor, Quebec; Suzanne Paradis; Department of Earth Sciences, Carleton University, Ottawa, Ontario; Marc R. Lafleche, Cambior Exploration, Destor, Quebec; Pierre Verpaelst, Ministere de l'Energie et des Res sources du Quebec, Rouyn-Noranda, Quebec; and Harold L. Glbson, Department of Earth Sciences, Carleton University, Ottawa, Ontario
Keywords: Stratisgraphy, Stratisgraphic synthesis, Rouyn-Noranda, Volcano-tectonic depression, Blake River Group, Stratisgraphie, Synthese stratisgraphique, depression volcano-tectonique
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Eastern Abitibi Subprovince (Quebec segment), contains two main types of gold deposits: the common quartz-vein type and the rare pyritic type. Both occur in areas dominated by volcanic rocks and are spatially associated with major fault zones. Quartz-vein gold deposits consist of simple to complex networks of quartz-carbonate-pyrite veins in reverse shear zones and extensional fractures. They occur in areas dominated by mafic volcanic rocks and are commonly associated with small syn-to-la...
Publication: Special Volume
Author(s): Francois Robert, Mineral Resources Division, Geological Survey of Canada 601 Booth St., Ottawa,
Keywords: Gold, Gold deposits, Abitibi, Quartz-vein, Rare pyritic, Fault zone, Or, Gites d'or, Veine de quartz, Pyriteux de types rare
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Abitibi volcano-plutonic belt forms the major portion of the Abitibi lithotectonic subprovince in the Superior Province. The Abitibi belt is composed essentially of" ( 1) approximately 2.7 Ga old volcanic and sedimentary rocks; and (2) gabbro, tonalite, granodiorite
and syenite intrusions occurring in well-defined prekinematic ( synvolcanic ), synkinematic and post-kinematic plutonic suites. Most of these rocks are metamorphosed to greenschist facies. Regional multi-phase deformation...
Publication: Special Volume
Author(s): Alain Simard, Andre Gobeil, Pierre Verpaelst, Maurice Rive, Sylvain Lacroix and Denis Racicot; Service Geologique du Nord-Ouest, Ministere d,energie et des Ressources du Quebec
Keywords: Geology, Geologic domains, Quebec, volcano-plutonic belt, granitic batholiths, mines.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Un trait marquant du cadre tectonostratigraphique de la Sous province de l'Abitibi est la presence de nombreux couloirs de deformation d' extension regionale et sub-concordants au grain stratigraphique. La presence de grandes masses granitoides qui perturbent l' allure du grain tectonique est typique de la partie nord de la Sous province de l'Abitibi. Des rides E-W constituees de complexes plutoniques precoces forment des reliefs structuraux agissant comme
des moles resistants qui interferent...
Publication: Special Volume
Author(s): Real Daigneault et Guy Archambault; CERM/Universite du Quebec a Chicoutimi, 555 boul. de l'Universite, Chicoutimi, Qc,
Keywords: Deformation, Abitibi, Quebec, Failles ductiles, Mines
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: L'Abitibi quebecois a produit essentiellement de l' or, du cuivre, du zinc et de I' argent, ainsi que de faibles quantites de nickel, de plomb, de molybdene, de bismuth, de lithium, de fer et d' amiante. Depuis l' ouverture de la mine Horne en 1927, cent-cinquante mines ont contribue a la production de 1 420 tonnes d' or. de 4,1 millions de tonnes de cuivre et de 4,7 millions de tonnes de zinc. Les productions minieres annuelles ont ete d'importance variable: des records de
production ont ete...
Publication: Special Volume
Author(s): Denis Racicot; Ministere de l'Energie et des Ressources -Quebec
Keywords: Geologie, Production miniere, Abitibi, Quebec, Mines
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Quelques soixante-dix sept plutons pntsenls dans la Sous-Province de Pontiac et dans Ia partie centrale de la Sous-Province de l'Abitibi ont fait l'objet d' une reconnaissance systbnatique. Ils ont ete regroupes en huit suites plutoniques majeures et trois suites mineures a partir de criteres geologiques et petrologiques. Parmi les suites majeures, quatre represenlent l'activite intrusive la plus ancienne dans la region. L'une d'entre elles est representee par deux complexes
anorthosito-gabbr...
Publication: Special Volume
Author(s): Maurice Rive, Service Geologique du Nord-Ouest Quebec, MERQ, 19, rue Perreault Ouest, Rouyn-Noranda, Quebec, Canada; Pintson, Hillar and Ludden, John N.
Institut de Recherche en Exploration Minerale, Department de Geologic, Universite de Montreal, C.P. 6128, Succ. A, Montreal, Quebec, Canada
Keywords: Plutonic rocks, Abitibi, Pontiac, Superior Province, Plutons, Geologie, Petrologie
Issue: 1990
Volume: SV 43
Year: 1990
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