CIM Journal, Vol. 7, No. 2

CIM Journal, Vol. 7, No. 2, 2016
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Texte
Sommaire: Block caving is the preferred underground mining method to profitably extract massive, low-grade orebodies; however, lack of cave access inhibits understanding the rockmass response to mining, which is needed for safer, more productive operations. Combining large datasets from multiple sources with virtual reality scientific visualization (VRSV) is an alternative method for understanding complex cave behaviour, by providing virtual access to the cave. A customized VRSV module was developed at...
Publication: CIM Journal
Auteur(s): J. D. Tibbett, F. T. Suorineni, and B. K. Hebblewhite
Mots clés: Block caving, Large multiple-source datasets, Time dependency, Virtual reality scientific visualization (VRSV)
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: Some non-flotation chemicals are added to flotation circuits directly and indirectly to control issues such as scaling and dust in other areas of the operations. Since dosage levels are generally not high, a standard laboratory float test may not be able to determine the effect of a specific chemical on the productivity of the flotation circuit. This paper presents a laboratory testing protocol that uses kinetic float studies to test the effect of normal to extreme doses of antiscalant and...
Publication: CIM Journal
Auteur(s): B. G. Cousins and B. O’Rourke, C. Spence
Mots clés: Chemicals, Flotation, Interferences, Kinetics
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: The relative-value (R-value), discrimination-factor (D-factor), and vector-ratio (V-ratio) method (RDVM) provides a geological knowledge-based statistical and geological-genetic interpretation scheme for geochemical data that enhances discovery in geochemical exploration. The practical advantage of RDVM is that it synthesizes geochemical features geologically related to ore-deposit discovery in three steps: reclassifying element concentrations using log-probability plots into R-values;...
Publication: CIM Journal
Auteur(s): C. I. Godwin
Mots clés: Anomalous population; Background population; Discrimination factor; Geochemical evaluation; Geological-genetic interpretation; Geological knowledge–based method; Log probability; Ore-deposit discovery; Relative-value (R-value), discrimination-factor (D-factor), and vector-ratio (V-ratio) method (RDVM)
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: The inverse slope method (ISM) was applied to reinterpret vertical electrical soundings (VES) data from pits at the Al-Sharquieh phosphate mine, in order to demonstrate applicability and suitability of the ISM for interpreting VES data from sedimentary phosphatic environments. The ISM overcomes limitations of the curve matching method and the complexity of lithological sections. The ISM geo-electrical interpretation results correlated well with lithologies of the pits. This method characteriz...
Publication: CIM Journal
Auteur(s): J. Asfahani
Mots clés: Al-Sharquieh mine, Syria; Inverse slope method (ISM); Phosphate; Vertical electrical soundings (VES)
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: Microseismic monitoring provides insight into the location and extent of rock-mass fracturing induced by cave mining, enabling interpretation of the cave profile and validation of predictive numerical models. Source location uncertainties can lead to misinterpretation of the inferred characteristics of the fracture network. One principal source of uncertainty is the velocity model used to invert the location algorithm. Large-scale 3D numerical models of modulus changes across a caved mass can...
Publication: CIM Journal
Auteur(s): J. M. Reyes-Montes, B. L. Sainsbury, J. R. Andrews, R. P. Young
Mots clés: Cave-scale model, Caving, Continuum elastic modulus modelling, Microseismicity, Velocity imaging
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: The St. Lawrence Granite hosts vein-type fluorite mineralization that was mined until 1977. Recent drilling identified a significant fluorite-bearing structure hosted in adjacent meta-sedimentary country rocks. Several phases of vein fill and brecciation indicate there are three phases of fluorite mineralization, of which the later two phases are volumetrically significant. The earliest fluorite is purple and occurs along joint and fracture surfaces, in fault-breccia matrices, and as...
Publication: CIM Journal
Auteur(s): J. H. Reeves Newspar, B. A. Sparkes, N. Wilson Newspar
Mots clés: Burin Peninsula, Fluorite, Fluorspar, Newfoundland, St. Lawrence Granite
Numéro: 2
Volume: 7
Année: 2016
Texte
Sommaire: This paper outlines geotechnical conditions that commonly exist in underground, hardrock mines and the challenges posed for ground-support steel, specifically rockbolts, used in these environments. A model is proposed whereby the in-situ stress and rock-mass classifications (based on Bieniawski’s rock mass rating) form the basis of determining the desired steel properties of the rockbolts used. Based on the ASTM F432 bolting specification, recommended minimum steel properties are defined for...
Publication: CIM Journal
Auteur(s): M. R. P. Snow
Mots clés: American Society for Testing and Materials (ASTM), Geotechnical, Ground support, Heat treatment, In-situ, Rock mass rating (RMR), Rockbolts, Steel
Numéro: 2
Volume: 7
Année: 2016
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