Long-Range Mine Planning At Gibraltar Mines Limited

Abstract The optimum design and sequencing of interior-stage pits and the selection of operating parameters, such as the mining rate, cut-off grade, metal price, etc., are interdependent factors that must be considered to achieve a maximum-profit mine plan. Long-range mine planning at Gibraltar is further complicated in that the property consists of four separate orebodies.
This paper discusses the package of computer programs implemented at Gibraltar for the development of long-range mine plans. A Lerch-Grossman three-dimensional pit design program is used for pit design and sequencing of interior-stage pits. A mine simulation program is used to produce production schedules and open-pit mining equipment requirements. Discounted-cash-flow techniques are used to evaluate alternate mine plan schedules.
Areas under consideration for further expansion of the computer mine design package will also be discussed.
Keywords: Open-pit mining, Gibraltar Mines Ltd., Mine planning, Computers, Pit design, Bench plans, Simulation.
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Publication: CIM Bulletin
Author(s): W. G. Deeks
Keywords: Mineral resources, Resource marketing, Marketing, Tariffs, Trade, Government controls.
Issue: 786
Volume: 70
Year: 1977
Text
Publication: CIM Bulletin
Author(s): A. D. Hunt
Keywords: Mineral resources, Fossil fuels, Reserves, Resources, Petroleum, Natural gas, Coal, Uranium, Energy resources.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: The social and environmental problems presented by the location of a large zinc/lead orebody within one mile of a thriving town are described. The development problems are social, involving the education of the inhabitants, and environmental, requiring the development of a planning strategy and the evolution of a baseline and post-operational monitoring system. The necessity for an environmental-impact assessment and a thorough baseline study is emphasized. The continuing psycho-social...
Publication: CIM Bulletin
Author(s): W. G. Dallas
Keywords: Environmental control, Mine planning, Development, Tara Mines Limited, Ireland, Water quality, Air quality, Noise, Vibration.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: The Peace River iron ore deposit represents the sole source of raw material for an integrated steel industry in Alberta. The ore has proved refractory to beneficiation by a number of techniques. A selective oil-phase agglomeration technique is described. Medium-grade concentrates, analyzing 48-53% Fe and 10-H% SiO2. were obtained with recoveries of about 75% of the total iron. These results appear to represent the optimum possible for this orebody.
Publication: CIM Bulletin
Author(s): A. F. Sirianni, B. D. Sparks
Keywords: Agglomeration, Peace River District, Iron ore, Beneficiation, Oolitic iron ores, Phosphorus.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: Since closure in 1968, the Wedge Mine, situated adjacent to the Nepisiguit River in New Brunswick, has been flooding with acidic water containing toxic levels of heavy metals. Cominco Ltd. has undertaken a series of pollution control measures to mitigate the threat posed to the river quality. Included has been a successful treatment campaign in 1976 which discharged in excess of 30 million gallons of high-quality effluent from the accumulated volume of mine water.
The sources of contamination...
Publication: CIM Bulletin
Author(s): W. J. Kuit, H. E. Jackson, R. M. Mattson
Keywords: Environmental control, Wedge Mine, Cominco Ltd., Acidic water, Effluents, Water pollution, Backfilling. Liming, Waste dumps, Dewatering.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: A brief review of the silver industry is presented to set the stage for the analysis of the distribution of silver production by source from various types of mines in Canada and of the changing relationship between the total output of silver and the total output of base metals. The decline in the average grade of the Canadian mines is also discussed and a trend for the future is proposed.
The report then examines in broader aspects the world 'primary silver production and concludes, in the...
Publication: CIM Bulletin
Author(s): J. G. George
Keywords: Silver, Economic notes, Production, Consumption, Trade, Marketing, Mineral economics.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: Process improvements which have reduced the lead content of staff from the Brunswick lead blast furnace are described. Microscope examination and electron micro-probe analyses, supported by the results of slag settling and viscosity tests, showed that typically about 70% of the lead in the lead blast-furnace slag was present in the form of entrained prills of metallic lead. The total lead content was found to increase with the magnetic susceptibility of the slag. Measurements in the furnace...
Publication: CIM Bulletin
Author(s): A. G. Matyas
Keywords: Brunswick Mining and Smelting, Slag, Blastfurnace slag, Lead smelting, Sinter, Settlers, Coke sizing, Roy tappers.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: Mineralogical studies and concentration tests were conducted on samples from an oolitic iron deposit from the Peace River district in Alberta to determine what concentrate grades and metal recoveries could be obtained. The samples assayed 32 to 37 wt. % Fe, and consisted of goethite, nontronite, ferruginous opal, siderite, quartz, amorphous phosphate and illite. Flotation with fatty acids yielded the best over-all results. A flotation concentrate from a composite sample of the iron horizon...
Publication: CIM Bulletin
Author(s): W. Petruk, I. B. Klymowsky, G. O. Hayslip
Keywords: Mineralogy, Mineral processing, Benificiation, Oolitic iron ores, Iron ore, Peace River District, Flotation, Separation, Ore dressing.
Issue: 786
Volume: 70
Year: 1977
Text
Summary: Hydrothermal systems form on land where and when an impermeable cap-rock unit (either natural or self-sealed), a permeable aquifer, and permeable discharge and recharge channels (cross-stratal permeability) develop in an anomalously hot part of the crust. A consideration of the relationship between magmatic and tectonic events in volcanically active areas indicates these conditions arise during: (1) the resurgent doming stage of the resurgent caldera cycle; (2) following movement on the...
Publication: CIM Bulletin
Author(s): C. Jay Hodgson, J. W. Lydon
Keywords: Geology, Exploration, Volcanogenic deposits, Massive sulphide deposits, Hydrothermal systems, Heat sources, Aquifers, Cap rocks, Tectonics.
Issue: 786
Volume: 70
Year: 1977
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