Mineralisations auriferes de la partie centrale de la Province de Grenville, Bouclier Canadien

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Mots clés : Gold mineralizalion;Gold;Melallogeny;Grenville Province
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Texte
Sommaire: The Cape Ray Fault Zone of southwestern Newfoundland contains two notable electrum/base metal sulphide quartz vein lode occurrences hosted by two contrasting lithological units, viz. a graphite schist horizon and a granite. The two occurrences, although in proximity, are not in direct contact, but, based on geochronological, geochemical and isotopic evidence, they were apparently deposited from hydrothermal fluids generated as a vapour phase from the magmatic progenitor of the Windowglass...
Publication: CIM Bulletin
Auteur(s): DEREK H.C.WILTON
Mots clés: Gold mineralization, Rare earth elements, Cape Ray, Electrum deposits, Hydrothermal fluids, Gold, Silver, Granites.
Numéro: 874
Volume: 78
Année: 1985
Texte
Sommaire: A low-grade concentrate from the Crevier Township, Quebec, containing 1.8% Ta2O5 and 13.7% Nb2O5 was reduced with carbon at 1600"C, and niobium and tantalum were selectively absorbed in liquid iron. To slag off the zirconia-rich gangue, some silica and lime were added as flux. Metallic iron was added in such a way that the combined contents of TaC and NbC did not exceed 20% in the ferroalloy. Up to 95% of the niobium, and up to 80% of the tantalum contained in the concentrate were...
Publication: CIM Bulletin
Auteur(s): M. NAGAMORI, A.J. PLUMPTON
Mots clés: Pyrometallurgy, Smelting, Leaching, Calcination, Niobium, Tantalum, Ferroalloys.
Numéro: 874
Volume: 78
Année: 1985
Texte
Sommaire: A trondhjemite stock intrudes a volcanic sequence that has massive sulphide lenses and that is metamorphosed to the green-schist fades at Gutcher Lake, 25 km north of Wawa, Ontario. The stock is 4 km2 in plan and is partly enveloped by an aureole of chlorite-epidote-amphibole hornfels up to 1 km wide. Within this contact aureole, biotite is partly pseudomorphosed by chlorite; epidote and hornblende are mottled by chlorite, calcite, plus quartz; albite has 0% An to 8% An; and hornblende...
Publication: CIM Bulletin
Auteur(s): P.A. STUDEMEISTER
Mots clés: Gold exploration, Gold-bearing veins, Regional metamorphism, Retrograde metamorphism, Felsic intrusions, Greenstone belts, Mineral alteration.
Numéro: 874
Volume: 78
Année: 1985
Texte
Sommaire: Kidd Creek is a large volcanogenic base metal sulphide deposit, located near the west end of the Abitibi greenstone belt, 27 km north of Timmins, Ontario. The rhyolite geology is characterized by a NNE-striking and steeply east-dipping package of rhyolite volcaniclastics upon which has been imposed a strong ESE-striking and north-dipping structural fabric. Massive rhyolite units with grey-black, chloritic cores and yellow, sericitic margins intrude as dykes into the stratigraphic footwall and...
Publication: CIM Bulletin
Auteur(s): P.P. GOAD
Mots clés: Economic geology, Kidd Creek Mine, Volcanogenic deposits, Base metal sulphide deposits, Rhyolite geology, Massive rhyolites, Rhyolite volcaniclastic, Crackle-brecciated rhyolites, Stringer sulphide zone, Hydrothermal alteration, Mature alteration, Immature alteration, Hydraulic fracturing, Evolution felsic pile, Exploration.
Numéro: 874
Volume: 78
Année: 1985
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