We also study the combined open-pit design and mining scheduling problem, which is the problem of simultaneously ﬁnding an ultimate pit contour and the sequence in which the parts of the orebody shall be removed, subject to mining capacity restrictions.
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Currently the Lerch Grossman (designed in 1964-1965) algorithm is used to define economic viability of a pit by outlining the ultimate pit using economic and mining parameters. It gets a bit more complicated when the mining project has several alternative processes for the same ore.
The planning and scheduling would take several man months if completed without pit optimization and scheduling software. Whittle 4D software proved to be very effective in providing optimized pits and a mine schedule in a short time frame.
Los límites finales de un open pit pueden ser determinados con ayuda de diversos algoritmos de optimización existentes como son: el del cono flotante y el de Lerchs-Grossmann; estas técnicas se basan en procesos iterativos, para los cuales se han desarrollado distintos programas computacionales que realizan dichos procesos.
Open pit optimisation using Lerch Grossman 3D algorithm MineMap IMS is highly effective for open pit optimisation. It was the first software to develop a fully integrated Lerch Grossman 3D algorithm, Lerch, enabling companies to undertake multiple bankable feasibility studies rapidly and with ease.
A method of precise pit optimization commonly used in the mining industry is the Lerch Grossmann method. The technique, founded in 3-dimensional graph theory, relies on a regular system of blocks which defines the value (profit, loss) and type (ore, waste) of material contained in the blocks.
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One of the most important design factors in open-pit mining is determination of the optimal pit. Pits may be redesigned many times during the life of a mine in response to changes in design parameters as more information is obtained and to changes in the values of technical and economic parameters.
By this method, from 740 million tons of geological ore reserve, 411 million tons can be mined by open-pit method with overall stripping ratio of 2.14:1. Cut off grade is found to be 0.32% Cu. The average ore grade is found to be 0.665% Cu.
The Lerch-Grossman module recognises these "air blocks" and discards them from the pit processing NOTE: The Lerch-Grossman module does not check if the benches of the model have the same thickness.LerchGrossman Pit Optimization MODEL REQUIREMENTS Block Models The Lerch-Grossman module works on block models only.
Arizona.LERCHS GROSSMAN ALGORITHM FROM DUAL SIMPLEX VIEWPOINT Open-Pit Mines Transactions. 1965.  Picard. Beyond Optimization in Open-Pit Design Proceedings of the First Canadian Conference on Computer Applications in the Mineral Industries.
These would include oil (refinery scheduling), transportation (allocation models), distribution (warehousing and order processing), education (class scheduling), and mining (plant optimization, and open pit operations).
The concept of pit optimisation and the Lerchs Grossman algorithm are reviewed. The implementation of the algorithm with respect to block models is considered. The concept is extended to solid models. Ore bodies are conceived to be divided into units that have significance to the mining engineer ...
Open pit mine scheduling based on fundamental tree estimation and reserve reporting, in Resource to Reserve Inputs algorithm, PhD thesis, Colorado School of Mines, Golden, Colorado, Seminar, pp 11-16 (The Australasian Institute of Mining and p 164.
Optimized open pit mine design, pushbacks and ... Open pit mine design and long-term production scheduling is a critically important part of mining ... The most well established procedure for producing ultimate pit limits is the Lerchs–Grossman (L–G) algorithm  and the nested pit L–G implementation for pushback design by Whittle  ...
Pickstone –Peerless Open Pit Optimisation Targets & Constraints 4. ... • It further represents a practical mining shape as opposed to a value derived shape from the Lerch – Grossman Optimal Pits Phases ... • The result is a long term mine schedule which is strategic with respect to NPV,
dynamic models for open cast coal mining pdf - Crushing Plant . ... lerch-grossman open pit scheduling - Zenith Hot-sale Products ... Open Pit Mine Design Models: ... PDF . his experience in open pit mines. ... list of equipments needed in a copper mine for open cast mining small scale;
using the software packages for strategic planning of open pit mining - Whittle and NPV Scheduler, in ... Final Pit Contour and Mining Schedule The scenario considered in this work involves limited processing of sulfide ore ... Both softwares are based on the Lerch-Grossman optimization algorithm. The es-sence of this algorithm is that, for a ...