AMC Consultants performed the open pit optimisation using the Lerch-Grossman algorithm coded into the Whittle software. The open pit shell used to constrain the esource was based on a net Mineral R smelter return (NSR) cutoff of A$32.42/t determined using the parameters defined above and the - following assumptions:

7/16 So Bench 6 is the maximum pit we can mine without actually incurring a cumulative loss, but mining to Bench/Pit 3 is the OPTIMUM (size) pit providing the best VALUE. This is how the "Lerch-Grossman" 3D pit optimization software works in Whittle or Datamine NPV scheduler.

The traditional pit-shell optimization (Lerch-Grossman or Pseudoflow) is still required to create the optimal pit shell. Pit shells are mostly independent of the schedule and stockpiling, and therefore can be done independently of an Advanced SIMO optimization. While this …

"Whittle" computer software that uses the Lerch-Grossman algorithm, which is a 3-D algorithm that can be applied to the optimisation of open-pit mine designs. The purpose of …

The open-pit mineral reserves were estimated using diluted resource model and pit optimisation software Whittle Four-X with the Lerch-Grossman algorithm to develop a series of nested pits for the mineral resource, considering the full open-pit option and initial topography.

Whittle, Brazil, Grossman, Rubinstein, & Thomas, 2018). Others address the consideration of ... to open pit optimization will be considered. ... mountaintop, and "Min* Exploitation" and the second group includes "Optimization", "Lerch Grossman", "Push & Relabel", and "Ant colony". Each keyword of th e first group will be ...

Grossman died in 1995. Whittle met Lerchs, who passed away last summer, at a CIM conference in the 1990s. "He had recently become aware that the algorithm was being used in mining," said Whittle. "Apparently he had happened to sit next to a miner on a flight, and the guy had asked if he was the Lerchs of pit optimization fame.".

Phase 2: Simultaneous Optimization. To truly receive the most value from a project, simultaneous optimization of mining sequence, cut-off grade, stockpiles and blending is performed. Whittle's SIMO module performs the optimization of all items in one step, producing a higher NPV solution than a sequential optimization of the same parameters.

A recent study by Bai, et al. was trying to compare the new Pseudoflow pit optimization engine that was implemented by GEOVIA Whittle with the Lerchs–Grossmann algorithm's pit optimization engine. In their study, which was conducted on a 32 GB RAM Intel Core i7 2.7 GHz CPU computer, one of the datasets had 21.3 million blocks.

In addition to several commercial software packages which can be use for optimization of mine planning and design; such as NPV Scheduler, Whittle 4-D and 4-X, etc. Among of these optimization techniques, mixed integer linear programming are recognized as having significant potential for optimizing production planning in large open pit mines ...

how whittle pit optimisation works lerch. how whittle pit optimisation works lerch The mine planning based on the original ore production profile 7 Mt year-1 in the initial years rising to 14 Mt year-1 in year 7 and that using pit optimization method which indicated a large number of improvements both technical and economic...

Whittle Pit Optimisation Works Lerch - imenet.eu. Lerch-Grossman pit optimization shell (2) Whittle pit optimization shell "This outcome, combined with drill results from areas below and outside of the pit . International Journal of Mining…

AMC Consultants performed the open pit optimisation using the Lerch-Grossman algorithm coded into the Whittle software. The open pit shell used to constrain the Mineral Resource was based on a net smelter return (NSR) cut-off of A$32.42/t determined using the parameters defined above and the following assumptions: 55° pit slopes were used ...

Whittle is a mine planning tool to optimize an open pit mine in order to maximize the output, i.e., Ore and NPV. Whittle software works on the geological model finally freeze in the Surpac Software. In order to carry out pit optimization, the economic pit limits were determined by using the Whittle (V. 4.7) software.

The success of Whittle Programming's Three-D and Four-D software products was founded on the mathematical proof provided by Lerchs and Grossmann [1] for their algorithm, and these products have set the standard for bankable feasibility study and sensitivity analysis tools for open-pit mine planning for the past 30 years.

Pit Optimization and Pseudoflow ("Lerchs-Grossmann on Steroids" ) Published on March 7, 2017 March 7, 2017 • 144 Likes • 16 Comments

The pits were designed by MineSight software, which uses a Lerch-Grossman 3D pit optimization algorithm to determine the optimum pit shell. nmlresources.com Les puits à ciel ouvert ont été dessinés au moyen du logiciel MineSight, qui utili se un al gorithme d'optimalisation de puits Lerch-Grossman 3D pour déterminer les limites ...

Nested Lerchs-Grossmann algorithm. Whittle used this algorithm in his Whittle programming 4D packages to generate a series of nested pits in which each pit is optimal for a different set of economic conditions [17, 18]. Therefore this technique could be referred as the first technique in which the economic condition

(121 Whittle, J. Beyond Optimization in Open-Pit Design Proceedings of the First Canadian Conference on Computer Applications in the Mineral Industries, A.A. Balkema, Rotterdam, p331-337. [13] Zhao, Y. and Y.C. Kim, A new Optimum Pit Limit 08sign Algorithm. Proceedingsof APCOM 1992. …

Ultra-Fast Pit Optimizer. GeoMine's FlowPit is an ultra-fast open pit optimization module. FlowPit implements the industry standard Lerchs-Grossmann's 3D pit optimization algorithm, but with a novel implementation. FlowPit's highly efficient and scalable implementation achieves a superior magnitude speed-up in comparison to competitors.

The series of nested pits produced give the mine designer possible pushback options. This is the approach used by Lerchs-Grossman implementation of Whittle [8]. A series of heuristically discounted pits is produced in a greedy fashion until it is no longer profitable to consider any further pits. The final pit is used as the ultimate pit limits.

1 Lerch-Grossman pit optimization shell 2 Whittle pit optimization shell. Updated Economics. Victory Nickel has twice updated the base case economics as a result of optimization work done to date. The first update resulted from the purchase of refurbished electrical equipment and revisions to the financial model (see press release dated June 21 ...

GEOVIA Whittle 4.7.1 has been released with a new pit optimization engine based on the pseudoflow algorithm. This pseudoflow algorithm creates the …

Lerch-Grossman is the name of a modeling approach for solving open-pit optimization. It was developed in 1965 and implemented in the 1980's by Jeff Whittle. The algorithm uses block dependencies to determine which blocks must be mined out as a group (i.e. if you mine G you must mine B, C, and D). The graphical relationship between blocks is ...

The block modelling technique assisted in construction reliable economic sub-models of multi-component ore body assigning a benefit function value to each block.The interface to Whittle's Three-D and Four-D pit optimization packages was implemented to produce optimal profitable mining sequence, which can be useful for both designing and ...

Definition of the optimum open pit, whether an intermediate phase or final design, will be sensitive to many factors. The most basic will include geological and mining constraints, mining and processing costs, pit slopes and product prices. The application of the three dimensional Lerchs-Grossmann pit optimization procedure to this task is described for a range of gold deposits.

Whittle Pit Optimisation Works Lerch - imenet.eu AMC Consultants performed the open pit optimisation using the Lerch-Grossman algorithm coded into the Whittle software. The open pit shell used to constrain the resource was based on a net smelter return (NSR) cut-off of AU$33.50/t determined using the parameters defined above and the following ...

After pit optimization is completed in Whittle, this module allows the import of Whittle 4X result files (.RES). There are additional functions included such as; export Vulcan phase variable as a pit list file, as well as export to Whittle Opti-Cut.

The Lerchs-Grossmann method of pit optimization, as implemented in Whittle Programming packages, offers mathematically reliable designs, which can guarantee to maximize pit value.

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GEOVIA Whittle – Pseudoflow Method for Pit Optimization – White Paper 1 FROM LERCHS-GROSSMANN TO PSEUDOFLOW: A SHORT REVIEW The general pit optimization procedure works based on two inputs: block values and pit slopes, where the slopes introduce constraints on removal precedence of the blocks. The output of