Metallogenesis in the Bay d'Espoir area, Southern Newfoundland

Abstract Bay d'Espoir is in the approximate center of the south coast of Newfoundland. The geology of the area can most conveniently be considered in terms of three units: (1) an Ordovician or older polydeformed terrain termed the Little Passage Gneisses; (2) a Lower-Middle Ordovician volcano-sedimentary sequence assigned to the Bate d'Espoir Group; and (3) granitoid intrusive rocks of mid-Paleozoic age. Mineralizing events accompanied the formation of the latter two units.The Bate d'Espoir Group comprises a dominantly sedimentary sequence of pre-Middle Ordovician shelf and distal tur-bidite sediments deposited on the eastern margin of lapetus. A significant volcanic component is, however, present in the Isle Galet Formation, consisting of up to 30% felsic volcanic rocks interbedded with sedimentary and epiclastic rocks. The Isle Galet Formation hosts several disseminated to thinly bedded Pb-Zn-Ag occurrences associated with altered felsic tuff and graphitic shale. They occasionally grade laterally into pyrite iron formation and appear to have been deposited in a very distal volcanic environment. The Isle Galet Formation is a time equivalent of the mineralized pre-Caradocian island-arc sequences of central Newfoundland, but differs from them both in style of volcanism and in the nature of the associated mineral deposits. It is, however, comparable in many respects to mineralized volcanic sequences in the La Poile Bay area of southwestern Newfoundland.Mineralization associated with granitoid rocks in Bay d'Espoir is best developed around the southeast margin of the North Bay Granite, where two-mica leucogranite forms a marginal phase. Numerous minor base metal showings occupy quartz, quartz-carbonate and barite veins in the adjacent sedimentary rocks. Collectively, the showings exhibit a well-developed, zonal pattern around the granite margin; molybdenite (±py, cpy) predominates near the contact, giving way outward to galena (±sph, py, asp, cpy) and eventually to stibnite (±asp, py) at the periphery. Mineralization associated with granites in similar settings elsewhere in southern Newfoundland includes tungsten in the Grey River and Granite Lake areas and molybdenite in the Rencontre Lake area.
Keywords: Geology, Metallogenesis, Bay d'Espoir area, Newfoundland, Mineralization, Ordovician rocks, Granitoids, Lithology.
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Summary: This paper describes the general layout of the environmental monitoring scheme at Devco's No. 26 Colliery, including wall face ventilation, fan performance and methane drainage, and then goes on to discuss the sensors, the outstation layout, the surface control room and the protection of the system.
Publication: CIM Bulletin
Author(s): S.K. SCHWARTZ
Keywords: Environmental control, Monitoring, Devco, Collieries, Coal mining, Fans, Methane, Sensors, Air velocity, Control.
Issue: 839
Volume: 75
Year: 1982
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Summary: A preliminary evaluation, based on existing data, has been made of the implications of placing radium-barium sludge in tailings areas. The study was restricted to a consideration of possible increases in the quantities of radionuclides escaping to the environment through either groundwater or surf ace water, considering the types of tailings treated and the effluent treatment systems currently operating in Canada.
Publication: CIM Bulletin
Author(s): P.M. HUCK, J.R. BROWN, G. MULTAMAKI, K.L MURPHY
Keywords: Environmental control, Tailings, Uranium tailings, Radium, Barium, Effluent treatment, Radionuclides.
Issue: 839
Volume: 75
Year: 1982
Text
Summary: This paper reviews the traditional mine accounting systems, including "custodialaccounting" and unit costing, and then suggests that the use of flexible budgets represents a more suitable method of reporting costs in order to assist the mine manager in improving productivity. Examples of various applications are given to show that the result is a clear reporting structure.
Publication: CIM Bulletin
Author(s): BERTRAND WOLFMAN, WILLIAM E. STANLEY
Keywords: Accounting systems, Mine accounting, Management, Custodial accounting, Unit costing, Budgets, Costs.
Issue: 839
Volume: 75
Year: 1982
Text
Summary: The problems presented by ice formation and interference with processes, structures and mechanical operations in the mining industry can be expected to increase sharply as more of our mineral needs are supplied from the far north. A process of rapid ice destruction is presented which lends itself to the effective removal or penetration of ice. Suggestions are offered for applying the system to problems related to mining activity in cold environments. The system can be readily adapted to...
Publication: CIM Bulletin
Author(s): ROGER C. PARSONS
Keywords: Northern mining, Ice, Chemicals, Permafrost, Drilling
Issue: 839
Volume: 75
Year: 1982
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Summary: The problems presented by ice formation and interference with processes, structures and mechanical operations in the mining industry can be expected to increase sharply as more of our mineral needs are supplied from the far north. A process of rapid ice destruction is presented which lends itself to the effective removal or penetration of ice. Suggestions are offered for applying the system to problems related to mining activity in cold environments. The system can be readily adapted to...
Publication: CIM Bulletin
Author(s): ROGER C. PARSONS
Keywords: Northern mining, Ice, Chemicals, Permafrost, Drilling.
Issue: 839
Volume: 75
Year: 1982
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Summary: The counter-current fluidized cascade is a novel and potentially efficient pneumatic gravity separation device. Data are presented on over 150 runs of cleaning Alberta thermal coals, covering several size ranges. The coarser sizes of coal were processed in admixture with afluidizing medium consisting of 0.5-by 0.1-mm hematite (or magnetite) and limestone particles. The partition curves for coal particles larger than about 3 mm, mixed with fluidizing medium, showed that the sharpness of...
Publication: CIM Bulletin
Author(s): J.M. BEECKMANS, M. GORANSSON, S.G BUTCHER
Keywords: Coal processing, Coal cleaning, Counter-current fluidized cascades, Gravity separation, Alberta coals, Fluidization, Reflux ratios, Partition curves.
Issue: 839
Volume: 75
Year: 1982
Text
Summary: This paper presents the geographic and geological setting of Saskatchewan Power Corporation's Poplar River Mine in south-central Saskatchewan, about 8 miles from the U.S. border. Generally the mine, which is being expanded to four million tons per year, is in an extremely disturbed geological area with severe dewatering problems. The lignite coal, which is strip mined, is supplied directly to an electric power generating station by means of a 7-mile unit-train private railroad.A number of...
Publication: CIM Bulletin
Author(s): M.H. ALLAN
Keywords: Coal mining, Saskatchewan Power Corporation, Poplar River mine, Reclamation, Lignite, Draglines, Dewatering programs
Issue: 839
Volume: 75
Year: 1982
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Summary: Sizing below 38 um (400 mesh) is an increasing requirement in mill testing laboratories. The Cyclosizer is gaining wide acceptance in this role. A recent alternative is to use electro-formed sieves (micro-sieves), which are available with openings down to 5 um. The advantage of micro-sieving is a cut size which is independent of mineral density, easier retention of the finest fraction and reduced purchase cost. A simple method of micro-sieving using an ultrasonic bath, which performs readily...
Publication: CIM Bulletin
Author(s): J.A. FINCH, M. LEROUX
Keywords: Milling, Testing, Sizing, Cyclosizers, Micro-sieves, Sedigraph, Silica flour, Copper oxide, Lead concentrate, Particle size.
Issue: 839
Volume: 75
Year: 1982
Text
Summary: Low-pressure sodium light sources have been available for several years, but have not received wide acceptance in underground mining. This is because they are difficult to operate using DC power, they are not an intrinsically safe light where explosive gases may be encountered and they give poor colour rendition.With the need for energy conservation, several Canadian hard-rock metal mines are now changing their lighting to low-pressure sodium, as it has the highest efficacy of any light...
Publication: CIM Bulletin
Author(s): D.A. TROTTER
Keywords: Underground mining, Lighting, Luminance, Illuminance, Sodium light, Mine lighting.
Issue: 839
Volume: 75
Year: 1982
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