The application of a total energy system at the Polaris mining project

Abstract The Polaris mining operation (Fig. 1) is located on Little Corn-wa/lis Island in the Canadian Arctic, an area with a very limited shipping season and a hostile climate. The operation consists of the underground works, barge-mounted concentrator facilities, concentrate storage and shipping facilities, a personnel accommodation complex and an airstrip.
The electrical energy for the operation is provided by four 2.3 MW diesel-generators installed on the barge. The power is distributed through a 4.16 KVsystem connected directly to the generators and to the large motors. All other loads are supplied at 600 V or 120 V.
The power plant has been designed as a Total Energy System with maximum energy efficiency and thus designed for maximum heat recovery. The waste heat recovered on a year 'round basis is expected to be sufficient for the process heating and drying as well as the space heating for offices and accommodations. The engine cooling system consists of two glycol-water loops, a "cold" loop for charge air and lube oil cooling and a "warm" loop for jacket water cooling. Each loop is complete with heat exchangers for heat recovery and out-door forced air radiators to dispose of excess heat. A water loop in the concentrator area transfers the heat from the jacket water loop and the exhaust gas boiler to the space heating equipment, the process and the heating system for the accommodations. Part of the exhaust gas is diverted to the concentrate dryers.
Keywords: Mining, High Arctic, Polaris mining project, Energy systems, Diesel generators, Air systems, Engine cooling systems, Exhausts, Heat utilization
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Publication: CIM Bulletin
Author(s): D.V. KREFTING, D.R. BENNETT
Keywords: Mining, Far North, Transport systems, Off-highway trucks, Highway trucks, Railways, Overland conveyors, Loading, Crushing
Issue: 862
Volume: 77
Year: 1984
Text
Summary: An experimental program has been carried out by the Australian Atomic Energy Commission to compare the effectiveness of Caro's acid as an alternative oxidant to pyrolusite in the leaching of uranium ores from the Alligator Rivers region of northern Australia. Batch leaching tests on Ranger, Nabarlek, Koon-garra and Jabiluka ores showed that uranium extraction was unaffected by choice of oxidant, but that Caro's acid reduced acid requirements by 15 - 25%. Lime requirements for neutralization...
Publication: CIM Bulletin
Author(s): R.J. RING, M. YAMINE, D.J. WATERS
Keywords: Uranium extraction, Caro's acid, Leaching, Oxidants, Pyrolusite, Hydrogen peroxide, Alligator Rivers ores
Issue: 862
Volume: 77
Year: 1984
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Summary: Operating heavy equipment in Labrador, where the winters are 8 months long and the temperature frequently drops below -40°F (-40°C) for days and sometimes weeks presents unique problems in both the operation and maintenance functions.
Winterization programs must be well designed and implemented at the proper time. These programs must include the proper selection of fuel oil, engine oil, hydraulic oils, greases, cooling system fluids, etc. More often than not, modifications have to be...
Publication: CIM Bulletin
Author(s): P. ALPORT, R.E.G. CAINES
Keywords: Mining, Far north, Equipment, Open-pit mining, Drilling, Blasting, Dewatering, Shovels, Hauling, Transporting, Iron Ore Company of Canada
Issue: 862
Volume: 77
Year: 1984
Text
Summary: The results obtained from the study of soil geochemistry in 14 test areas as well as along six regional traverses clearly indicate that there are important variations in the trace-element content of the A1 soil horizon developed on glacio-lacusthne sediments. The observed dispersions are in all probability attributable to the same sources which are responsible for the anomalies in the groundwaters and the basal till.
Of the fourteen test areas chosen, thirteen are clearly anomalous in the...
Publication: CIM Bulletin
Author(s): J.-P. LALONDE, M. BEAUMIER
Keywords: Exploration, Exploration geochemistry, Pedogeochemistry. Soil, Humus, Glacio-lacustrine sediments, Till, Groundwaters.
Issue: 862
Volume: 77
Year: 1984
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