Reinforcement and telemetry monitoring of a wedge structure

Abstract Recent engineering advances in open pit rock mechanics have resulted in improved pit wall slope design and improved operating procedures in the event of a major wall instability. At the other end of the spectrum, on the scale of single bench failures, considerable discretion is left to the mine operators as to how potential problems are handled. The usual alternatives are either to operate with caution beneath potential hazards, or try to bring the unstable rock down. In specific cases it may be advantageous to attempt to stabilize rock structures for reasons of access and operating safety.
At the Brenda Mines open pit a prominent structure on the north wall had caused recurring bench-scale wedge failures when exposed on each mining level. In spite of operating precautions a shovel was hit by a rockfall causing significant damage. The first section of this paper describes the investigative, design, and stabilization methods which permitted subsequent mining beneath the structure to proceed without incident. Emphasis is placed on the personnel and equipment resources available at the mine site which were used to minimize costs and which would be available at most operating mines.
The second section describes an ongoing research project that utilizes radio telemetry to transmit slope monitoring data. As part of this project the wedge structure was instrumented so that it could be continuously monitored with the aid of a computer. The application demonstrated the potential of 'microchip' technology to remote data collection and processing as related to rock structure monitoring, slope stability and safety.
Keywords: Rock Mechanics, Open pit mining, Slope monitoring, Computer applications, Wall stability, Brenda Mines
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Publication: CIM Bulletin
Author(s): Michel David, Eric Toh
Keywords: Geostatistics, Grade control, Ore sampling, Dilution, Blasthole sampling
Issue: 931
Volume: 82
Year: 1989
Text
Publication: CIM Bulletin
Issue: 931
Volume: 82
Year: 1989
Text
Summary: Cluff Mining has successfully operated a gold recovery plant at its Cluff Lake operation in northern Saskatchewan to recover gold from Phase 1 uranium leach tailings. The operating circuit consists of tailings repulping, grinding, cyanidation, carbon-in-pulp, gold recovery, and cyanide destruction by acidification, volatilization and re-neutralization. The process is described and operating data and metallurgical results from the operation are provided.
Publication: CIM Bulletin
Author(s): L.A. Melis
Keywords: Mineral processing, Gold recovery, Gold refining, Cluff Lake operation, Uranium leach tailings, Metallurgy, Cyanide recovery.
Issue: 931
Volume: 82
Year: 1989
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Summary: Recovery of gold from refractory ores and concentrates presently constitutes one of the most important, challenging, and exciting areas ofR&D activity in the gold processing industry. New technologies are being tested for the treatment of refractory gold materials, some of which have been advanced to the level of commercial operation. In this paper, some recent technological developments in the hydrometallurgical processing of pyritic matrix-refractory gold ores are highlighted. Key...
Publication: CIM Bulletin
Author(s): G.P. Demopoulos, V.G. Papangelakis
Keywords: Gold processing, Biochemical oxidation, Hydrochemical oxidation, Hydrometallurgical technology, Pressure oxidation, Refractory ores
Issue: 931
Volume: 82
Year: 1989
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Summary: Unassayable gold and platinum group metals have come into vogue in the 70s and 80s in certain jurisdictions as a means of perpetrating fraud. Usual arguments are that a particular ore is not amenable to "conventional fire assaying". Explanations for unassayable gold usually revolve around: evaporation of micron-size gold; vaporization of organic gold complexes; volatization of gold halides; alloying of gold with PGM's which prevents fusion or alloying which prevents collection.
This...
Publication: CIM Bulletin
Author(s): W.G. Bacon, G.W. Hawthorn, G.W. Poling
Keywords: Mineral processing, Gold analyses, Assays
Issue: 931
Volume: 82
Year: 1989
Text
Summary: Mineralogical investigations in connection with gold metallurgy are usually performed to find the reason for poor recoveries by cyanidation or by other leaching techniques. Poor recoveries most commonly are obtained when (1) native gold is encapsulated in an insoluble mineral as "invisible gold"; (2) native gold is coated with a precipitate; (3) gold-bearing products are insoluble in cyanide solutions; (4) carbonaceous material in the ore adsorbs gold; and (5) associated minerals...
Publication: CIM Bulletin
Author(s): William Petruk
Keywords: Gold, Refractory gold, "Invisible gold", Alloys, Mineralogy, Recovery
Issue: 931
Volume: 82
Year: 1989
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