Mining

Abstract The Cassiar Asbestos mine is situated on McDame Mountain in northern B.C. at a mean elevation of 6000 ft (1830 m), some 6 miles (9.6 km) from the townsite/mill complex. Asbestos ore production averages 1,200,000 tons at 9% R.M.G. (Recoverable Mine Grade) and waste production is 6,000,000 cu. yd annually.
Waste is loaded by P&H 1900 AL 11-cu.-yd shovels and transported by 75-ton and 85-ton end-dump trucks to the waste dumps. The ore is loaded by a 992 Caterpillar 10-cu-yd front-end loader into 50-ton and 75-ton trucks, which transport it to the crushing plant located at the mine. The ore is transported by a 15,370-ft (4685-m) tramline to the mill complex.
Keywords: Cassiar mine, Asbestos, Open-pit mining, Drilling, Blasting, Lauding, Haulage, Mining methods, Dewatering, Crushing.
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Publication: CIM Bulletin
Author(s): W. R. Tyson
Keywords: Metallurgy, Physical metallurgy, Temper embrittlement, Surface analysis, Steels, Alloy steels, Segregation studies, Auger Electron Spectroscopy.
Issue: 792
Volume: 71
Year: 1978
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Summary: Owing to the inadequacy of the ore transport system at Cassiar in the late 1960's, a new facility was required. This paper traces the various alternatives considered and gives a description of the tramline as installed. The problems encountered, changes made and future modifications are discussed in detail, together with the effects these have on maintenance and operations.
Publication: CIM Bulletin
Author(s): Peter C. Jones
Keywords: Cassiar Mine, Asbestos, Transportation, Tramlines, Loading, Ropes, Wire ropes, Cables.
Issue: 792
Volume: 71
Year: 1978
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Summary: Located in the northern part of the Province of British Columbia, the Cassiar Mine started development of its asbestos orebody in 1952, and is currently producing 105,000 tons of asbestos fibre annually. The townsite is nestled in a beautiful valley and supplies more than average facilities. The fibre is shipped to more than 40 countries and is used in many industrial products.
Publication: CIM Bulletin
Author(s): Brian G. Pewsey
Keywords: Cassiar Mine, Asbestos, Townsite, Services, Manpower, Transportation.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: The paper gives a broad view of the maintenance procedures at the Cassiar Asbestos Corporation property. Comparisons are drawn to indicate the changes in facilities and approach that have evolved over the last 25 years while coping with the northern British Columbia climatic conditions. Special emphasis has been placed on the importance of the support groups providing services for both the mine site and the town.
Publication: CIM Bulletin
Author(s): Peter C. Jones
Keywords: Cassiar Mine, Asbestos, Maintenance, Concentrators, Power plants, Electrical systems, Plumbing.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: Sohio Petroleum Company's new L-Bar uranium mill near Grants, New Mexico, refines 2722 kilograms of yellowcake daily from 1360 metric tons of ore produced at Sohio's J.J. No. 1 mine and other nearby mines.
This paper follows the ore from the mine through the various processing steps — semi-autogenous grinding, acid leaching, countercurrent decantation, solvent extraction, ammonium diuranate precipitation, washing and drying, and tailings disposal.
Publication: CIM Bulletin
Author(s): M. H. Pettibone, W. W. Cody
Keywords: Metallurgy, Uranium mills, L-Bar uranium mill, Grinding, Leaching, Decantation, Solvent extraction, Precipitation, Tailings disposal, Coatings, Linings.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: Mine planning at Cassiar consists of an annual cycle of projection, control, evaluation and revision following completion of annual diamond drilling during the summer months. The inherent difficulty in evaluating fibre grade and distribution, combined with a high-wall phase or push-back mining system, requires continuous modification to designs and schedules based on a cumulative evaluation of equipment performance and prediction versus production. To expedite the planning sequence, a...
Publication: CIM Bulletin
Author(s): G. Scott Zimmer
Keywords: Cassiar Mine, Mine planning, Drilling, Sampling, Pit design, Reserve calculations, Scheduling, Computers.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: The Cassiar orebody is located in a sill-like serpentinite body intrusive into the Devonian-Mississippian sedimentary rocks of northern British Columbia. Subsequent intrusion of the Cassiar batholith formed the McDame synclinorium and produced chrysotile asbestos.
Present information indicates an orebody of approximately 16,277,000 tons amenable to open-pit mining, but continued diamond drilling will be needed to accurately define total tonnage and grade. A program has been developed at the...
Publication: CIM Bulletin
Author(s): Fred G. Hewett
Keywords: Cassiar Mine, Geology, Mine geology, McDame synclinorium, Sylvester Group, Structural geology, Drilling, Adit exploration, Grade control, Reserve estimation, Computers.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: The milling complex, situated just east of the Cassiar townsite, receives raw ore from the tramline and processes it into 105,000 tons per year of milled asbestos fibre. The ore is passed through a concentrator, where a barren rock fraction is removed. The concentrated ore, representing 70% of the feed, is dried, stored and then milled into nine separate fibre classifications. The finished product is packaged into 100-lb bags and loaded into trucks in one-ton units. New air-handling facilitie...
Publication: CIM Bulletin
Author(s): David C. Cook
Keywords: Cassiar Mine, Asbestos, Milling, Concentrators, Dryers, Ventilation, Tailings disposal.
Issue: 792
Volume: 71
Year: 1978
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Summary: The environmental control program at Cassiar Mine is an active one involving government, unions and company personnel all working together to achieve a goal — "A clean and safe working environment". This can only be achieved by utilizing three of Cassiar's most important resources; i.e., people, time and money. Past environmental programs have more than proved that the goal can be reached and, with the future programs now in progress, Cassiar Asbestos will achieve its environmental goals.
Publication: CIM Bulletin
Author(s): Melvin S. Taylor
Keywords: Cassiar Mine, Asbestos, Environmental control, Dust monitoring, Fibre counts, Ventilation.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: With the demand for larger diameter raises under all ground conditions and the increasing price of drill rods and operating costs, it was evident that there was a need for a raise borer with a variable-speed drive and fast-response torque limiting control. The raise boring machine described in this paper was developed after several years of market research and discussions with mine operators and construction contractors.
This paper discusses the Ingersoll-Rand raise borers with the solid-stat...
Publication: CIM Bulletin
Author(s): Lyle F. Smith
Keywords: Equipment, Mining equipment, Raise boring, Solid-state drives, Motor drives, Motor control, Safety, Maintenance.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: The formulation of a theoretical basis for the evaluation of in-situ coal through the use of geophysical logs is outlined. This involved the development of an approach to the interpretation of resistivity in environments having multiple conductive and non-conductive components. Utilizing this approach and other conventional interpretation techniques, a program was developed yielding accurate determinations of the in-situ percentages of coal, water and ash for the evaluation of coal deposits....
Publication: CIM Bulletin
Author(s): K. W. Edwards, K. M. Banks
Keywords: Coal exploration, Geophysical exploration, Logging, Drillhole logging, Resistivity, Density, CWA method, Core analysis.
Issue: 792
Volume: 71
Year: 1978
Text
Summary: In December 1977, a large pillar was removed by blasthole mining methods at Inco's Creighton No. 3 mine. Although the 2,363,000-ton blast was not a size record for a single underground blast at Inco, it did represent a significant departure from conventional blasthole mining. In terms of the application of nominal 6-inch-diameter boreholes underground, coupled with bulk slurry explosives, the magnitude of the blast is considered a first and very important development.
The application of...
Publication: CIM Bulletin
Author(s): P. F. Venus, G. W. Johnston
Keywords: Underground mining, Blasthole mining, Inco, Explosives, Slurry explosives, Creighton mine, Drilling, Pillar blasting, Ventilation, Vibration monitoring.
Issue: 792
Volume: 71
Year: 1978
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