The weighting of assays and the importance of both grade and specific gravity

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Mots clés : Specific gravity;Grade determination
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Publication: CIM Bulletin
Auteur(s): Ron Jessulat
Mots clés: Sulphide dust explosions, Blasting, Water-gel stemming cartridges.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: After a blast, the volume of the blasted rock normally occupies more space that it did before the explosion. The degree of such swell significantly affects the efficiency of digging the muck with a shovel or dragline. This paper explains why swell occurs, and describes the new subroutine SWELL of the blast simulator BLASPA which can simulate blast-induced swell. Results are also presented which display the effect of various blasting parameters on the degree and distribution of the swell...
Publication: CIM Bulletin
Auteur(s): R.F. Favreau
Mots clés: Computer applications, Blast-induced swell, Blast simulators, BLASPA, SWELL.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: This paper describes the progress accomplished at the Noranda Technology Centre in the field of three-dimensional computer-aided underground blast design. Traditional methods of laying out underground blasts are reviewed, and the new computer-aided approach is described. Time savings achieved through the use of BLASTCAD can be advantageously used to better engineer blasts, using models and blast vibration analysis. Future work involving the attachment of blast models directly to the system is...
Publication: CIM Bulletin
Auteur(s): P. Favreau, P. Andrieux
Mots clés: Computer applications, Underground mining, Blast design.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD) and Electron Probe Micro-Analysis (EPMA) were used to characterize chemically the gold complex adsorbed on activated carbon from a solution containing 102 mg/L Au and 0.5 g/L thiourea. This paper also considers the gold chloride and the gold cyanide systems. The results indicate gold is adsorbed on activated carbon from the thiourea solution as the gold (I) thiourea complex, i.e. Au[CS (NH2)2]2+. Other gold species such as...
Publication: CIM Bulletin
Auteur(s): J.R. Brown
Mots clés: Mineral processing, Gold complex characterization, X-ray photoelectron spectroscopy, Surface chemistry, Thiourea.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: It is extremely difficult for a mine's central control room operator to control peak power demands and to maintain normal materials handling operations at the same time. An investigation of the Falconbridge Strathcona Mine's central control room has revealed that there are more than eight thousand possible combinations of "situations" that can arise. For such a circumstance, an expert system can become a very valuable tool to assist the operator in taking the most appropriate and...
Publication: CIM Bulletin
Auteur(s): Y.L. Su, S. Vongpaisal, H.A. Smith
Mots clés: Computer applications, Expert systems, Power management, Strathcona Mine.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: Experiments on the ignition of sulphide dust clouds by explosives have been conducted in a 1 m3 explosion chamber. The explosives tested are ANFO, emulsion, aluminized emulsion and Detasheet. By controlling the composition of the ANFO and the emulsion explosive the oxygen balance could be changed in order to identify the dominant factors in the ignition of sulphide dust clouds by explosives. Experimental results, combined with theoretical calculations, show that the temperature of the...
Publication: CIM Bulletin
Auteur(s): P.D. Katsabanis, Q. Liu
Mots clés: Sulphide dust, Explosives, ANFO.
Numéro: 967
Volume: 86
Année: 1993
Texte
Sommaire: Modular Mining's computerized LHDposition monitoring and dispatching system commenced operation at the De Beers Finsch Mine in mid-1991. A sophisticated blend of proven and new technologies links the dispatcher at the workstation console on the surface with the LHD operators several hundred metres below. The dispatcher allocates each LHD to apriority tip and loading drive based on instructions provided by the miners and shift bosses underground. LHD operators receive tip and loading drive...
Publication: CIM Bulletin
Auteur(s): Russell A. Luke
Mots clés: Computer applications, Dispatching systems, Underground mining.
Numéro: 967
Volume: 86
Année: 1993
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