Grade Control Practices At Steep Rock Iron Mines Limited

Abstract As at any other mine in Canada, grade control procedures are used at Steep Bock Iron Mines (1) in order to ensure that concentrator and pellet-plant operators have a uniform feed so that they can manufacture a pellet to suit buyers' specifications and (2) to maximize ore recovery so that as little as possible finds its way to the waste dump or is downgraded by contamination. At Steep Rock, material grading 40% to 66% Fe is considered ore. The ore may contain up to 10% sulphur. These ranges create six different stockpile types, with the possibility of more if large concentrations of arsenic are encountered. Although grading and mining techniques used to accomplish these ends are fairly standard, there is an appreciation and willingness by hourly and staff pit personnel to make grade control effective. This produces vertical and horizontal communication, which is necessary for success in this field.
At Steep Rock, the waste-to-ore ratio is greater than at any other iron ore mine in Canada. Also, a high percentage of the ore mined is direct pellet feed. For these reasons, grade control is very important.
Keywords: Grade control, Steep Rock Iron Mines Ltd., Open-pit mining, Iron ore, Sampling, Assaying, Stockpiling.
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Publication: CIM Bulletin
Author(s): S. H. Schulz
Keywords: Hoisting, Friction hoists, Koepe hoists, Ropes, Braking, Retardation, Tension, Safety, Underground mining.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: A comparison of the amount of minus-28-mesh product produced by a standard grinding test procedure is provided for 45 non-metallic materials. The percentage of product, the weight of product per unit of energy used and the weight of product per mill revolution are shown.
The results exhibited excellent reproducibility and demonstrated an accurate comparison of grindability for non-metallic materials.
Publication: CIM Bulletin
Author(s): R. A. Wyman
Keywords: Grinding, Non-metallics, Industrial minerals, Mineral processing.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: The geochemical interpretation of results of statistical analysis of published multi-element stream sediment data from southwest and northern New Brunswick is presented. Element concentrations in southwest New Brunswick are low and comparable to element concentrations in background areas in northern New Brunswick. Deposits of copper and nickel are indicated in southwest New Brunswick. Anomalous element concentrations occur in several areas in northern New Brunswick and the elements most...
Publication: CIM Bulletin
Author(s): R. P. Chapman
Keywords: Exploration, Geochemical exploration, Stream sediments, New Brunswick, Drainage basins, Rocky Brook area, Copper, Zinc, Manganese.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: Energy conservation is an integral part of Canada's energy strategy. We must pursue conservation and energy management vigorously if we are to remain competitive in domestic and world markets, and minimize our reliance on external energy sources.
Energy management in industry is discussed from three viewpoints: (1) as a means of directly improving profitability; (2) as a major factor in the supply picture; and (3) as a significant influence on Canada's balance of payments and over-all...
Publication: CIM Bulletin
Author(s): Edward R. Lauer
Keywords: Energy resources, Conservation, Government policy, Office of Energy Conservation, Power costs.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: A new Code of Practice for the brake performance of off-highway vehicles was established in Alberta in 1976. Vehicles loaded to gross vehicle weight must be capable of stopping with mechanical brakes five times in quick succession on a grade of 10 per cent from a speed of 28 miles per hour. Comparative trials of various brake systems have been carried out and some combinations capable of meeting the Code are identified. Some problem areas in truck braking are reviewed and potential developmen...
Publication: CIM Bulletin
Author(s): Graham Walker
Keywords: Open-pit mining, Trucks, Equipment, Brakes, Off-highway vehicles, Haulage vehicles, Alberta.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: Radioisotope X-ray techniques of analysis for nickel have been tested in laboratory and plant trials. In the laboratory tests, a comparison was made of radioisotope and conventional analyses for nickel in solids samples taken from streams of a nickel concentrator. Coefficients of variation of 1.7% for feed and concentrate samples, and equal to 10% for final tailing samples, were obtained.
Continuous determination of nickel in final tailing slurries was demonstrated in a trial lasting 20 days...
Publication: CIM Bulletin
Author(s): V. L. Gravitis, J. S. Watt , G. J. Wenk, L. R. Wilkinson
Keywords: Process control, On-stream analysis, Nickel, Slurries, X-ray analysis, Radioisotopes, Tailings.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: The principles and utility of in-situ coal gasification are discussed, and a first field test conducted by the Alberta Research Council in 1976 near Forestburg, Alberta, is described. The test was carried out in a 12-ft subbituminous coal seam under 60 feet of cover. Within this seam, a 30-by 60-foot block, containing approximately 650 tons of coal, was delineated by four injection/production holes which were oriented to take advantage of the natural fracture system in the coal. Linkage...
Publication: CIM Bulletin
Author(s): N. Berkowitz, R. A. S. Brown
Keywords: Gasification, Coal, In-situ gasification, Forest-burg, Combustion, Reaction zones, Data processing.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: The paper gives an assessment of Canada's energy supply'-and-demand position, the current situation and projections into the future, as well as a review of some alternative energy futures for Canada. The main elements of Canada's energy strategy for the period 1977-1990, with particular reference to the role of energy conservation, are discussed, leading into the development of the national energy conservation program.
"Among the most remarkable results . . . has been the re-examination which...
Publication: CIM Bulletin
Author(s): lan E. Efford
Keywords: Energy resources, Conservation, Resource utilization, Energy policy, Environmental control.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: The Jabiluka One and Two uranium deposits occur in Lower Proterozoic metasediments of the Cahill Formation, which is part of the Pine Creek Geosyncline in the East Alligator River area, Nothern Territory. The Jabiluka One deposit coincides with a "window" through un-conformably overlying Middle Proterozoic sandstone of the Kombolgie Formation; Jabiluka Two is completely covered by that sandstone. The observed part of the Cahill Formation exhibits four horizons which are favourable hosts for...
Publication: CIM Bulletin
Author(s): M. R. Hegge
Keywords: Mineral deposits, Uranium deposits, Jabiluka uranium deposits, Exploration, Australia, Stratigraphy, Petrology, Alteration, Metallogenesis.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: The rapid expansion of exploration drilling with anticipated production facilities for oil and gas in the Mackenzie Delta region of the Northwest Territories has created a demand for granular construction materials. This paper discusses the technique adopted and experience gained by the authors from several major resource evaluation programs in this remote area. The first part of the paper describes a methodology for deposit identification, logistics of helicopter and ground-based drilling...
Publication: CIM Bulletin
Author(s): D. W. Hayley, N. R. MacLeod
Keywords: Industrial minerals, Granular materials, Construction materials, Aggregates, Mackenzie Delta region, Drilling, Exploration, Resource evaluation, Gravel, Permafrost, Soils.
Issue: 788
Volume: 70
Year: 1977
Text
Summary: Statistics for copper consumption from various sources show that the importance of production from secondary sources is increasing. This is of particular significance in countries such as the U.K., which are totally dependent on secondary material for the supply of home-produced copper. A brief survey of the U.K. industry has shown that, in the past, relatively high profit margins have not encouraged high capital investment and development of more sophisticated operating techniques, but set...
Publication: CIM Bulletin
Author(s): D. H. Pulling, F. A. Garner
Keywords: Mineral processing, Smelting, Copper smelting, Continuous smelting, Scrap, Secondary copper, Heat losses, Blast furnaces, Worcra Process, Noranda Process, Electrolysis.
Issue: 788
Volume: 70
Year: 1977
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