Truck-haulage economics of mining open pits by high bench

Abstract
This paper reviews an analytical model that defines the relationship of weight-weighted or volume-weighted average haulage distance with bench height and other related parameters, presents the optimum bench heights under various conditions in terms of minimizing the weighted average haulage distance of ore/waste during the full lifetime of an open pit mine, and discusses the truck-haulage economics of mining open pits by high bench, specifically by 15 m, 18 m and 20 m benches through marginal analyses. The observations from these analyses disapprove the previous conflicting assertions that the over-all weighted average haulage distance either increases or decreases directly with bench height. It is concluded that: (1) an increase of bench height to 15 m from 12 m is likely to be viable under the general conditions of large-scale deep open pit mines; (2) the reduction of haulage cost is much limited with the case of increasing bench height to 18 m from 15 m; and (3) the feasibility of mining open pits by 20 m benches is generally questionable. These conclusions may serve as a useful guide for those who advocate open pit mining by high bench.
Keywords: Open pit mining, Haulage, Modelling, Bench height, High bench.
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Summary: The in pit dam construction and utilities relocation, known as the East Mine Corridor Relocation (EMCR) project, was developed to extend the life of the east side of the Base Mine pit by two years. This will result in the recovery of an additional 80 million barrels of oil and delay expenditures associated with the opening of the North Mine by two years. To accomplish this, a large in pit earth structure was required to provide a new embankment foundation for relocating a public highway, four...
Publication: CIM Bulletin
Author(s): Leo Piciacchia, John MacNeil, Robert Cameron, Colin Ashton
Keywords: Open pit mining, Dam construction, Syncrude Canada Ltd.
Issue: 993
Volume: 88
Year: 1995
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Summary: Miller chlorides, which are a mixture of silver and copper chlorides, are produced when impure molten gold is refined with chlorine. Usually the copper and silver are recovered from the chlorides by a hydrometallurgical cementation process. However, this process is slow, requires considerable floor space, and generates waste water solutions which are not environmentally acceptable. In the present work, the pyrometallurgical reduction of the Miller chlorides was investigated according to the...
Publication: CIM Bulletin
Author(s): C.A. Pickles, J.M. Toguri, R.A. Bergman, J. Clark, H. Truong
Keywords: Metallurgy, Miller chlorides, Pyrometallurgy, Metal recovery processes
Issue: 993
Volume: 88
Year: 1995
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Summary: Geostatistics has been widely accepted as a standard tool for reserve estimation and mine planning. Kriging has been adopted as the best estimator of grade. Although many discussions have been conducted in the use ofkriging in the mining industry, insufficient attention has been given to solutions for over-smoothing. This effect has been frequently encountered in many mines. The so-called over-smearing refers to two facts: (1) over-reduction of grade variabilities and (2) over-estimation of...
Publication: CIM Bulletin
Author(s): Guocheng Pan
Keywords: Reserve estimation, Kriging, Variogram modeling, Search architecture, Smearing.
Issue: 993
Volume: 88
Year: 1995
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Summary: Omai Gold Mines Ltd. is the operator of a large-scale open pit gold mining operation located in Guyana, South America. Construction at the mine began in September 1991 and the process plant of a capacity of 12 000 tonnes per day reached commercial production in January 1993.
The remote location of the mine requires an extensive logistics support to ensure adequate material supplies. Over 60% of the consumables valued at US$35.0 million per year are supplied from North America.
One particular...
Publication: CIM Bulletin
Author(s): G.H. Veillette
Keywords: Omai Gold Mines Limited, Gold mining, Mill design, Open pit mining.
Issue: 993
Volume: 88
Year: 1995
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Summary: With the implementation of more advanced monitoring, control and locating systems in surface mines, there is an ever increasing need for their mine-wide integration toward achieving over-all optimization. AQUILA Mining Systems Ltd. is developing the basis for a comprehensive real-time monitoring, control and information system called the Total Mining System or TMS. This system is being designed to address both current and future needs of open pit mines toward improving productivity and...
Publication: CIM Bulletin
Author(s): Jonathan Peck, Jim Gray
Keywords: Automation, Open pit mining, Total Mining System.
Issue: 993
Volume: 88
Year: 1995
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