Classification of quartz veins in turbidite, hosted gold deposits, greenschist fades, eastern Nova Scotia

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Mots clés : Mineral exploration;Gold;Greenschist facies;Quartz veins;Meguma group
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Sommaire: This paper illustrates the different ways grade-tonnage curves can be generated for a mineral deposit. It emphasizes systematic discrepancies between reality, estimates and actual production according to different estimation methods and grade control programs. It does not offer a universal solution to the prediction of grade-tonnage curves. Hopefully, it will inspire caution to mineral economists who use estimated grade and tonnage data in the establishment of an optimum cut-off grade for a...
Publication: CIM Bulletin
Auteur(s): MICHEL DAGBERT
Mots clés: Geostatistics, Statistics, Estimation methods, Cut-off grades, Grade-tonnage curve, Grade distribution, Mining dilution, Selective mining units, Kriging.
Numéro: 898
Volume: 80
Année: 1987
Texte
Sommaire: The unconformity beneath 75 per cent or over 6000 km? of the Athabasca Basin in Alberta lies within economically exploitable depths. The basement beneath this unconformity consists of an extension of the Wylie Lake Pluton, locally faulted and containing areas ofmylonitic rocks. While the rocks of the Wylie Lake Pluton are not promising host rocks for uranium ore deposits, the areas ofmylonites, graphitic rocks and possible remnants of granite gneiss would bear closer examination. One area of...
Publication: CIM Bulletin
Auteur(s): JOHN WILSON
Mots clés: Mineral exploration, Economic geology, Athabasca Basin, Uranium deposits, Alberta, Geochemistry.
Numéro: 898
Volume: 80
Année: 1987
Texte
Sommaire: Basal till sampling techniques were used to search for gold mineralization in the Timmins, Ontario area. During 1978 and 1979, approximately 90 overburden sampling drill holes were completed in Murphy and Hoyle Townships to test specific geophysically defined target areas. A conventional tricone dual tube drill system, and a unique retractable tricone/rock coring system were used to various advantages.
First pass till sampling at 800 to 1200 ft intervals perpendicular to ice transport...
Publication: CIM Bulletin
Auteur(s): G.A. HARRON, R.S. MIDDLETON, R.B. DURHAM, A. PHILIPP
Mots clés: Mineral exploration, Geochemistry, Geophysics, Gold exploration, Till, Mineralization, Surveys, Drilling.
Numéro: 898
Volume: 80
Année: 1987
Texte
Sommaire: La scorie produite par le proc^de pyrometallurgique d'extrac-tion Noranda contlent environ 5% de cuivre. Elle est traitee comme un mineral conventionnel de cuivre au concentrateur de Mines Noranda et les rejets deflottation presentent encore des teneurs souvent superieures a 0.3% en cuivre. La scorie est principalement constitute de magnetite, de fayalite et d'un verre siliceux. Bien sur, le cuivre y est majoritairement sous forme de sulfures et d'un peu de cuivre metallique. Le verre...
Publication: CIM Bulletin
Auteur(s): M.A. BERUBE, M. CHOQUETTE, P.W. GODBEHERE
Mots clés: Copper slags, Ore mineralogy, Ore microscopy, Electron microprobe analysis, Ore processing, Mineral liberation, Noranda Mines.
Numéro: 898
Volume: 80
Année: 1987
Texte
Sommaire: The results of humus and overburden geochemical surveys over the Doyon, Bousquet and Page- Williams gold ore deposits are presented. These studies show that humus sampling for gold gives negative results over the Doyon deposit. The lack of response is probably caused by the presence of 1 m of relatively impermeable glaciolacustrine clay and silt that overlies 1 m to 2 m of till over the surface expression of the ore zone. By contrast, positive responses for gold occur in humus samples over...
Publication: CIM Bulletin
Auteur(s): C.F. GLEESON, D.G. SHEEHAN
Mots clés: Mineral exploration, Geochemical surveys, Gold ore deposits, Humus geochemistry, Till geochemistry, Overburden drilling.
Numéro: 898
Volume: 80
Année: 1987
Texte
Sommaire: The increase in the price of gold in the last decade has led to a significant increase in placer gold exploration around the world. Placer deposits occur in depressions along ancient river and stream channels. In many instances these channels have been covered with materials from subsequent erosion or glacial activity. Use of high resolution geophysical techniques to map the bedrock and soil strata can improve the probability of finding the placer deposits. The buried bedrock surface is often...
Publication: CIM Bulletin
Auteur(s): J.L DAVIS
Mots clés: Mineral exploration, Placer exploration, Ground probing radar, Geomorphology, Stratigraphy, Seismic sounding, Radar, Data processing.
Numéro: 898
Volume: 80
Année: 1987
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