Estimation of leakage in ventilation ducting

Abstract A simple method is presented whereby the additional quantity and static pressure necessary to compensate for ventilation duct leakage may be estimated using the circular reference functions of modern spreadsheets. Favourable comparisons have been made to the National Coal Board (United Kingdom) design charts and to a case study analysis.
Keywords: Ventilation system, Leakage, Estimation, Air, Pressure
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Summary: Comparable transaction analysis is the best known of the market approaches to valuation of exploration-stage mineral properties. The analysis of option and farm-in agreements can also provide useful guidance to valuators. While such approaches can be distorted by incomplete analysis, market-based methods are capable of providing consistent, credible results when carried out carefully with due consideration paid to all factors which buyers and sellers consider when dealing in the real market.
Publication: CIM Bulletin
Author(s): R.D. Lawrence
Keywords: Valuation, Mineral properties, Market approach
Issue: 1060
Volume: 95
Year: 2002
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Summary: In salt and potash mines, the time-dependent deformation mechanism should be clearly understood based on in situ measurements to predict the performance of a mining design. In this study, in situ deformation measurements from the Waste Isolation Pilot Plant (WIPP) and other salt and potash mines were used to determine the transition time from the primary to the secondary creep stage and to investigate the influence of adjacent excavations such as a nearby tunnel excavation, panel excavation...
Publication: CIM Bulletin
Author(s): S. Kwon, J.W. Wilson
Keywords: Underground mining, In situ measurements, Potash, Deformation, Excavation
Issue: 1060
Volume: 95
Year: 2002
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Summary: In 1994, Gold Mines of Australia acquired the rights to the historic Mt. Lyell copper mine, and commenced a feasibility study into expanding production. The ore was shown in laboratory tests to be amenable to single-stage, fully autogenous grinding (FAG) of underground primary crushed ore, and this route offered the maximum cost savings. Flotation performance was expected to be enhanced. However, batch flotation tests done on pilot-scale autogenously ground ore showed an unexplainable...
Publication: CIM Bulletin
Author(s): N.C. Clarke, K.J. Henley, T. Wu, M. le Page
Keywords: Autogenous grinding, Copper, Mineralogy, Flotation, Ore
Issue: 1060
Volume: 95
Year: 2002
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Summary: Acid mine drainage (AMD) is one of the most significant environmental challenges facing the mining industry worldwide. It occurs as a result of natural oxidation of sulphide minerals contained in mining wastes at operating and closed/decommissioned mine sites. AMD may adversely impact the surface water and groundwater quality and land use due to its typical low pH, high acidity and elevated concentrations of metals and sulphate content. Once it develops at a mine, its control can be difficult...
Publication: CIM Bulletin
Author(s): N. Kuyucak
Keywords: Acid mine drainage, Prevention, Tailings, Environment, Waste, Sulphides
Issue: 1060
Volume: 95
Year: 2002
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Summary: Vanadium mineralization occurs in oxide-rich horizons within layered metagabbro zones of the Sinarsuk deposit, West Greenland. The main oxide minerals are vanadiferous magnetite and ilmenite, comprising 30% to 90% of the rock volume and the ratio of magnetite to ilmenite ranges from 3:2 to 4:1. Ore microscopy shows that magnetite and ilmenite vary between 0.2 mm and 4.5 mm in grain size, but locally they are coarser grained. Grains are subhedral to euhedral and annealed suggesting that they...
Publication: CIM Bulletin
Author(s): T. Grammatikopoulos, A. McKen, C. Hamilton, O. Christiansen
Keywords: Beneficiation, Magnetite, Ilmenite, Vanadium, Process mineralogy, West Greenland
Issue: 1060
Volume: 95
Year: 2002
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