REE and background Au/Ag evidence concerning the origin of hydrothermal fluids in the Cape Ray electrum deposits, southwestern Newfoundland

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Mots clés : Gold mineralization;Rare earth elements;Cape Ray;Electrum deposits;Hydrothermal fluids;Gold;Silver
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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: The recent opening of Muscocho's gold mine at Montauban, as well as the discovery of several new copper-gold showings of a similar nature near the confluence of the Saguenay and St. Lawrence has revealed the existence of a new metallogenic gold province which is located within supercrustal units of Helikian age within the Grenville Province. Three metalliferous belts have been identified, each one of which is related to a series of SW-NE trending faults. The first is located in southeastern...
Publication: CIM Bulletin
Auteur(s): MICHEL GAUTHIER, GAETAN MORIN, PIERRE MARCOUX
Mots clés: Gold mineralizalion, Gold, Melallogeny, Grenville Province, Monlauban region.
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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