Gites de wollastonite, province tectonique de Grenville, Quebec

Abstract Quebec's portion of the Grenville geological province holds over 100 known wollastonite showings and deposits. Exceptionally favourable sectors for wollastonite exploration are located between the municipality of Grenville and Mont-Tremblant Park (north of St-Jovite). Other promising sectors are located in the Lac-Saint-Jean, Shawinigan and Gatineau areas. Deposits may be classified into nine categories depending on their relationship to intrusive rocks, discordant or concordant contacts with the host rocks, morphology, and major structural controls. Deposits consist mainly of wollastonite, calcite and clinopyroxene. They may contain one or several of the following minerals: feldspar, scapolite, quartz, titanite sulphides, zoisite, clinozoisite, garnet, idocrase andprehnite. Wollastonite content may reach over 70%. Some deposits are associated with graphite veins. Better understanding of the geology, combined with the proposed classification provides new exploration guide for wollastonite. Several deposits have grades of economic interest. Further work is needed to determine if any of these deposits can be exploited for profit.
Keywords: Industrial minerals, Wollastonite deposits, Grenville province
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Summary: The second vertical derivative method of processing aero-magnetic data from low level helicopter surveys yields results correctable with the known geology and may be utilized to indicate possible targets for future exploration in the Silver Queen and Equity Silver mines areas, near Houston in central British Columbia. The principal zones of alteration associated with mineralization, known from detailed mapping, are further delineated and extended in a way not possible by a cursory examination...
Publication: CIM Bulletin
Author(s): B.N. Church, A.R. Pettipas
Keywords: Aeromagnetic data, Second derivative, Mine geology, Structure, Alteration, New targets, Exploration, Map interpretation
Issue: 934
Volume: 83
Year: 1990
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Summary: Since the late 1800s, the Grenville Province in Quebec has been an important and diversified source of industrial minerals. The Ministere de l'Énergie et des Ressources du Quebec, under the Canada-Quebec Mineral Development Agreement, and the private sector have put an emphasis on exploration, mapping and evaluation programs in the Grenville Province for minerals, particularly since 1983. These programs have led to the discovery and the development of deposits such as architectural...
Publication: CIM Bulletin
Author(s): Henri-Louis Jacob, Suzie Nantel
Keywords: Exploration, Industrial minerals, Grenville Province
Issue: 934
Volume: 83
Year: 1990
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Summary: Several occurrences of disseminated galena, including a former producing mine, are found in Pennsylvanian fluviatile sandstone of the Salmon River Basin, Cape Breton Island, Nova Scotia. Detailed study of the distribution of these occurrences has revealed that highest galena concentrations are found in sandstone overlying channel-shaped depressions infelsic basement rocks. These buried depressions, in turn, correlate in position with modern streams in areas of basement exposure. This...
Publication: CIM Bulletin
Author(s): D.F. Sangster, P.D. Vaillancourt
Keywords: Exploration, Sandstone-lead deposits, Mineral deposits, Salmon River Basin
Issue: 934
Volume: 83
Year: 1990
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Summary: Indicator kriging is one of the nonparametric geostatistical techniques, ideal for estimating the reserves of irregular mineralizations (e.g. gold, uranium, platinum, diamonds, etc.). Such mineralizations are characterized by variograms which are very sensitive to extreme values (outliers) and very difficult to model.
The classical approach to this problem in the industry is to trim off these high grades using arbitrary empirical upper limits established either from practice or subjectively....
Publication: CIM Bulletin
Author(s): K. Fytas
Keywords: Gold deposits, Geostatistics, Indicator kriging
Issue: 934
Volume: 83
Year: 1990
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Summary: The purpose of this paper is to identify a number of currently available opportunities for exploration and/or mine development in the industrial minerals field in southeastern Ontario. The paper is not intended as a complete review of the industrial minerals industry in southeastern Ontario, but highlights what are seen by the authors as areas where there are immediate opportunities for investment and growth.
Traditional exploration targets in the Grenville Supergroup in southeastern Ontario...
Publication: CIM Bulletin
Author(s): P.W. Kingston, A. MacKinnon, William F. Caley
Keywords: Industrial minerals, Exploration opportunities, Wollastonite, Nepheline, Fluorspar
Issue: 934
Volume: 83
Year: 1990
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Summary: Several types of stratiform and epigenetic gold deposits have been found in New Brunswick. It is the purpose of this paper to describe and classify the epigenetic deposits and demonstrate their relationship to tectonic evolution. The stratiform deposits are mostly volcanogenic massive sulphide deposits that are described elsewhere (Davies et al., 1985).
The auriferous epigenetic deposits include quartz-carbonate veins and stockworks, polymetallic veins, contact metasomatic, porphyry copper...
Publication: CIM Bulletin
Author(s): A.A. Ruitenberg, S.C. Johnson, L.R. Fyffe
Keywords: Exploration, Gold deposits, New Brunswick Appalachians, Epigenetic deposits.
Issue: 934
Volume: 83
Year: 1990
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Summary: The phosphate deposit, located in the Abu Tartur plateau between the Kharga and the Dakhla Oases in the southern part of the Western Desert of Egypt, is the largest of its kind in the country. The phosphates are found in two horizons referred to as the Lower and Upper Phosphate Horizons within the Late Campanian Sibaiya Formation which belongs to the Nubia Group.
This paper presents the results of a geostatistical study on the main phosphorite bed at the base of the Lower Phosphate Horizon...
Publication: CIM Bulletin
Author(s): A. Sahin, A.A. Abdul-Latif
Keywords: Exploration, Geostatistics, Phosphate deposits, Abu Tartur, Kriging, Grade estimation
Issue: 934
Volume: 83
Year: 1990
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