Distinguishing ore types at the Lac des Iles PGE-gold-copper-nickel mine, Ontario: Implications for resource modelling, mining and processing

Abstract A cornerstone of any successful mining
project is an understanding of the mineral
assemblage and metal distribution comprising the deposit. Knowledge of the precise mineral/metal zoning enables an operation to utilize different mining and processing methods optimized for different parts of the deposit. The Lac des Iles mine, located in northwestern Ontario, is one operation that depends on a good understanding of these issues. Current
resources for the Roby Zone total 94.1 Mt
grading 1.66 g/t Pd, 0.18 g/t Pt, 0.14 g/t Au,
0.062% Cu, and 0.053% Ni. The Roby Zone occurs within the gabbroic portion of the Lac des Iles intrusive complex and consists of three compositionally and texturally
different ore types with variable PGE, base and precious metal contents. PGE occur as sulphides and bismuthotellurides in net-textured sulphides, coarse sulphide blebs and as finegrained inclusions within secondary silicates. Knowledge of the precise mineral/metal zoning has directly and indirectly improved several operational aspects, including resource modelling, mining, and processing. For example,
metallurgical recoveries have been
increased by up to 3% to 5% and concentrate
grades have increased by up to 100%.
Keywords: Ore types, Lac des Iles, Mineralization,
Resource estimation, Mining, Metallurgy,
Geology.
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Publication: CIM Bulletin
Author(s): D. Berkley
Keywords: Cogeneration, Remote location, Feasibility, Reliability, Energy supply, Turbines.
Issue: 1068
Volume: 96
Year: 2003
Text
Summary: The development of low-cost, rapid multielement analytical techniques has generated large geochemical databases in many exploration programs. When a sampling program consists of several thousand samples, the resulting data matrix is enormous and effective interpretation using all of the elements individually becomes burdensome. However, the application of multivariate statistical techniques can extract geochemical patterns related to the underlying geology, weathering, alteration and...
Publication: CIM Bulletin
Author(s): E.C. Grunsky, B.W. Smee
Keywords: Geology, Mineralization, Geochemical
data, Multivariate methods, Digital
topography, Mineral exploration.
Issue: 1068
Volume: 96
Year: 2003
Text
Summary: The Red Dog mine has increased mill
throughput most years since start-up. Although flotation equipment has been added over the last 10 years, the Red Dog metallurgical performance has been restricted by a lack of adequate flotation capacity. Two reduced tonnage trials conducted in 1997 as well as numerous SAG relines have consistently indicated the potential to significantly increase both zinc concentrate recovery and grade with additional flotation capacity. Later in 1999, a new circuit was...
Publication: CIM Bulletin
Author(s): B. Lacouture, G. Hope
Keywords: Flotation, Modelling, Plant design, Circuit configuration.
Issue: 1068
Volume: 96
Year: 2003
Text
Summary: Geological and technical problems are
often considered the most important ones
affecting new mining projects. Typical problems and likely causes are reviewed based on current Quality Management and Continuous Improvement (QMCI) perspectives, giving particular attention to the work of W.E. Deming. As the “system approach” is an essential part of these policies, its characteristics are described with particular attention given to cultural-
behavioural, organizational and systembased
constraints...
Publication: CIM Bulletin
Author(s): M. Vallée
Keywords: Quality management and continuous
improvement (QMCI), Industry problems,
Mining system constraints, Risk, Geology.
Issue: 1068
Volume: 96
Year: 2003
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