Application of conditional simulations to resource classification schemes

Abstract Geostatistical conditional simulations are becoming increasingly popular as tools that provide models of uncertainty at different stages of a mining project. They have been used as grade control tools in daily operations to assess the uncertainty of mineable reserves at the project’s feasibility stage, and to assess mineralization potential in certain settings. Other applications include assessment of recoverable reserves, resource and reserve classification, and drill hole spacing optimization studies. All large-scale applications of conditional simulations intend to benefit from the correct (or accurate) characterization of uncertainty, adequately describing the variability observed from the data and its effect on the final objective. The objective of this paper is to compare the ad-hoc uncertainty model provided by a traditional classification scheme with the probability intervals resulting from a conditional simulation model. It is argued that the uncertainty model derived from the use of classification schemes is of little practical use to the mining company or operation. The paper emphasizes differences in uncertainty based on the size of the mining unit considered, the extraction method, and local geological differences. Most importantly, it discusses confidence intervals for these mining units, as compared to the relative precision envisioned by a typical classification scheme. The application described in this paper is taken from a medium-sized Cu open pit and underground mine in northern Chile, and demonstrates the impact of several variables on the resulting conditional simulation models. It also compares a more traditional resource classification scheme applied, and the wide difference in local confidence intervals for each mining unit.
Keywords: Geostatistical conditional simulation, Resource classification, Probability intervals, Open pit, Underground mine.
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Publication: CIM Bulletin
Issue: 1079
Volume: 97
Year: 2004
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Publication: CIM Bulletin
Author(s): A. Basdag, Hidd, Bahrain and A.I. Arol
Issue: 1079
Volume: 97
Year: 2004
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Summary: This memorandum discusses a potential trigger mechanism for a toppling failure in rock slopes. What is proposed here is not a general case for all toppling failures. It is instead a postulated driving mechanism for slopes meeting specific inherent geometric and geologic conditions. That having been said, these conditions appear to be met in many toppling situations. As the initial trigger phase of the proposed toppling mechanism is easily analyzed, this model may be of use to other slope...
Publication: CIM Bulletin
Author(s): J.I. Mathis
Issue: 1079
Volume: 97
Year: 2004
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Summary: The mining sequence at Noranda’s Bell-Allard mine calls for two mining fronts retreating toward a central pillar known as the Retreat Zone between pyramids A and C. It is clear from numerical modelling and rock mass characterization that the induced stress level in the pillar will exceed the rock mass capacity. A mining plan was developed including the re-dimensioning of stopes in the Retreat Zone, additional ground support and instrumentation in order to ensure the safety of the workforce...
Publication: CIM Bulletin
Author(s): V. Falmagne, G. Gagnon, D. Ouellet, B. Simser
Keywords: Retreat Zone, Bell-Allard mine, Mining strategy, Stope.
Issue: 1079
Volume: 97
Year: 2004
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Summary: This paper describes a sudden spill of waste rock used for backfilling from a waste pass at an underground mine in Canada, thus causing a major failure/accident. The mine operator immediately launched a detailed investigation to understand the causes of this accident and develop procedures to prevent any recurrence of such events in the future. The authors from McGill University were invited to collaborate with the engineers at the mine to examine this accident. The events leading to the...
Publication: CIM Bulletin
Author(s): F. Hassani, J. Ouellet, P. Gauthier, K. Moozar
Keywords: Liquefaction, Fill raise, Bousquet Complex, Case study.
Issue: 1079
Volume: 97
Year: 2004
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Summary: A research effort has been undertaken, under Workplace Safety and Insurance Board of Ontario (WSIB) sponsorship, to characterize the support capabilities of conventional and innovative spray-on lining materials for mitigating dynamic failure effects created by simulated rockbursts. Conventional spray support media, such as shotcrete and fibrecrete linings, and a variety of new spray-on lining materials [thin, spray-on liners (TSLs)], typically polymer-type thin coatings, were subjected to...
Publication: CIM Bulletin
Author(s): J.F. Archibald, P.D. Katsabanis
Keywords: Blast damage mitigation, Spray-on linings, Field testing.
Issue: 1079
Volume: 97
Year: 2004
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Summary: Ground vibration is the natural result of the blasting process. Many empirical formulae and methodologies including analysis of travel path effects have been developed. The scaled distance, which is the most popular approach for the calculation of the attenuation of particle velocity in the ground, has led to significant advances in the prediction of particle velocity when both explosive charge and distance vary. However, this approach does not consider the effect of ground anisotropy and...
Publication: CIM Bulletin
Author(s): G.G.U. Aldas, H.A. Bilgin
Keywords: Blast vibration, Seismic wave, Wave propagation, Vibration measurement.
Issue: 1079
Volume: 97
Year: 2004
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