Tectonic setting and sulphide deposits of the Hackett River Belt, Slave Province

Abstract Belts of Yellowknife Supergroup volcanic and sedimentary strata in the Slave Structural Province are separated by granitoid complexes. The strata and most intrusive rocks are 2.7 and 2.5 Ga old, but rocks around 3.1 Ga have been recognized in some of the complexes and are believed to represent a once-extensive sialic crust. Volcanics were erupted along rifts in this crust and the rifts became sites of crustal foundering and the development of troughs that filled with turbidites of volcanic and granitoid provenance. Present margins of the granitoid complexes may be close to the original margins of deposition of volcanics, with associated mineral deposits, and close to the thickest parts of basins of sedimentation.The Hackett River volcanic belt extends 100 kilometres between Mara River and Back River and is crudely S-shaped, with a northern sector surrounding a core of granitoid basement rocks, a northeasterly facing central sector and a southerly facing southern sector. Up to 8 kilometres of andesitic volcanics with intercalated felsic volcanic rocks are preserved within the central sector. The felsic rocks include thick lenses of volcaniclastics with large, quartz-eye-bearing clasts, but the known metal deposits are not associated with these. Both of the deposit areas, the Hackett River area in the northern domal sector and the 'A itch' Lake area 40 kilometres to the south in the central sector, are near the tops of relatively thin atypical volcanic sequences above suspected basement rocks. The Yava deposit near 'Aitch' Lake overlies a unit of subaerially deposited, welded, andesitic ash flows and the Hackett River deposits overlie highly metamorphosed volcaniclastic rocks that include suspected ignimbrites.The deposits are notably argentiferous and lead-rich. They consist of stratigraphically zoned sheet-like bodies of iron sulphides, sphalerite, galena and chalcopyrite underlain by altered rocks containing chalcopyrite stringers. The Yava deposit was formed where hydrothermal fluids exuded through the fractured floor of a flooded caldera basin. The Hackett River deposits may have been formed in a similar setting and it is not inconceivable that all the known deposits in the belt were formed in a single large caldera basin, although there is no independent evidence for the required major fault separation between the Hackett River dome and the 'Aitch' Lake area.
Keywords: Slave Province, Archean, Basement rocks, Tectonics, Ig-rimbrites, Volcanogenic sulphide deposits, Sulphide deposit zonation, Hackett River Deposits, Yava deposit.
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Summary: Under high pressure in a deep potash mine, the salt rock behaves in accordance with the concept of a generalized, perfectly plastic substance. The paper presents the evidence of this behaviour and engineering concepts for room-and-pillar design.
Publication: CIM Bulletin
Author(s): D. MRAZ
Keywords: Industrial minerals, Rock mechanics, Salt formations, Potash mining, Underground mining, Room-and-pillar mining, Plasticity, Stress distributions, Pressure distribution, Pillars.
Issue: 815
Volume: 73
Year: 1980
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Summary: This paper describes the development and application of single-stage fluidized bed continuous ion exchange to the following processes: removal of base metals from mine water; cyanide removal from gold mill waste; uranium removal from sulphuric acid leach liquor; and uranium removal from mine water.
Publication: CIM Bulletin
Author(s): B.H. LUCAS
Keywords: Hydrometallurgy, Ion exchange, Fluidized beds, Cyanide removal, Gold mill waste, Uranium removal, Sulphuric acid, Resin, Mine water treatment, Dome Mines Limited, Denison Mines Limited, Beaverlodge Mine.
Issue: 815
Volume: 73
Year: 1980
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Summary: The energy situation is extremely fragile and there is a critical need for energy conservation in the short term and development of new technology in the long term. To keep tabs on energy flow, separate electrical metering is being installed in major industries. The first step reduces demand through peak load control; the second reduces the waste of energy by monitoring energy used per unit of production.
Publication: CIM Bulletin
Author(s): T.B. ARMSTRONG
Keywords: Energy management, Electrical energy, Metering, Conservation, Load factors, Process control.
Issue: 815
Volume: 73
Year: 1980
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Summary: An economical, pollution-free process has been developed for the hydrometallurgical extraction of copper from sulphide ores. The extracted copper, in the form of cuprous chloride (CuCl), is converted by reduction to copper metal. The metal is melted and fire-refined into wire bars which meet the standards of electrolytic tough pitch (ETP) copper wirebars.
Publication: CIM Bulletin
Author(s): J.H. McNAMARA, W.A. AHRENS, J.G. FRANEK
Keywords: Hydrometallurgy, Copper extraction, Cyprus Copper Process, Cymet process, Leaching, Fluid-bed reactors, Sulphide ores.
Issue: 815
Volume: 73
Year: 1980
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Summary: The effect of composition and process variables on the properties of Marmet and modified Ni-Hard slugs will be discussed. The effect of shape on the over-all performance of grinding media and its relationship to the end product has been investigated and these results will be reviewed. The cost effectiveness of slugs versus balls has been well documented under various operating conditions and this will be presented in detail.
Publication: CIM Bulletin
Author(s): G.G. JACOX, J.C. FAROE
Keywords: Corrosion, Metallurgy, Grinding media, Slugs, Balls, Wear, Alloys, Steel, Cast iron, Milling.
Issue: 815
Volume: 73
Year: 1980
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Summary: The modest thermal efficiency of the steam turbine cycle essentially determines the heat required and, therefore, the coal consumption and ash production of pulverized-coal-fired powerplants.This paper emphasizes how some properties of coal and its ash can crucially affect the operation of a steam generator and its flue gas cleaning equipment.A brief reference to some siting factors and economics reaffirms the all-pervasive influence of the properties of coal and ash and establishes the...
Publication: CIM Bulletin
Author(s): D.R. WRIGHT
Keywords: Coal, Energy resources, Powerplants, Steam generators, Ash, Stack emissions, Filters, Precipitators, Scrubbers, Sulphur dioxides, Desulphurization, Nitrogen oxides, Pulverizers, Lignite, Thermal efficiency, Environmental control, Cooling water.
Issue: 815
Volume: 73
Year: 1980
Text
Summary: The Conservative Government's budget proposals brought forward on December 11, 1979 have been withdrawn, but they are far from dead. On the contrary, a number of those budget proposals, especially the ones which would close loopholes and result in other technical changes being made to the Income Tax Act, should be considered to be alive and well.It is not unreasonable to expect the next government, of whatever political persuasion, to reintroduce many of these technical changes in the next...
Publication: CIM Bulletin
Author(s): ROBERT D. BROWN
Issue: 815
Volume: 73
Year: 1980
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Summary: In 1943, potash mineralization was first recognized in the Prairie Evaporites of the Province of Saskatchewan in a deep oil-well hole. Exploitation started in 1950 under a shroud of doubt that this huge reserve could be mined. It was fraught with almost insurmountable physical problems in penetrating the Prairie Evaporites. After 12 years of experimentation and development of new shaft-sinking methods, mining equipment and processes to treat the high-grade potash ore (sylvanite), a new era of...
Publication: CIM Bulletin
Author(s): M.A. UPHAM
Keywords: Industrial minerals, Potash, Markets, Saskatchewan, New Brunswick, Underground mining, Solution mining, Production costs, Taxation, Exports, Transportation.
Issue: 815
Volume: 73
Year: 1980
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