### Open Pit Optimisation and Design: A Stepwise Approach*

2.2 Pit Optimisation Pit optimisation was carried out, using Whittle software. The resource block model and the economic and technical parameters were used to produce a set of nested pits. Fig. 4 depicts a summarised flow chart for the pit optimisation process. LEGEND Grade >2g/t 1≤ grade ≤2g/t 0< grade < 1g/t Grade = 0

### Professional Development Courses ROBUST STRATEGIC …

Heavy blocks and and pit optimization Exclusion polygons and pit optimization Whittle Exercise 1 – Gold-Copper – Pit Optimization Day 3 Whittle Lab04 – Control Mining Direction & Pre-stripping Constrain the direction and growth of pit shells Producing directional shells using expressions

### Definition of lerchs - pflege-kompetenzteam.de

How whittle pit optimisation works lerch. All other blocks are waste and have the value -19 structural arcs for each block draw the lerch-grossman network and determine the most profitable pit to keep the example simple we will use squares and assume a 45o slope 230worksheet 5 two dimensiona. View All; Is there a role for lerchs

### Anyone know the theory behind Lerchs-Grossman pit ...

Anyone know the theory behind Lerchs-Grossman pit optimisation? I keep finding articles and abstracts that talk about Lerchs-Grossman pit optimisation that say that the algorithm has a basis in graph theory. I haven't seen any articles that elaborate on what part of graph theory was used to create this optimisation method. ... Whittle software ...

### Nevada Net Proceeds Tax and Open Pit Optimization – Stope

May 27, 2019· 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 …

### Stochastic Open Pit Design with a Network Flow Algorithm ...

In this thesis, different optimization methods are described, including the conventional (deterministic) Lerchs-Grossman algorithm and network flow algorithms as well as stochastic extension with multi-destinations. 1.1 Open Pit Optimization The optimization of a mine design may be formulated as a complex, large scale mixed integer

### The Three Phases of Mine Planning | Driving Digital ...

Nov 14, 2014· 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 variable cut-off grade strategy (as opposed to a static marginal cut-off grade) allows the highest value material to be processed soonest in the mine life.

### DETERMINATION OF ULTIMATE PIT LIMITS IN OPEN MINES …

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

### Open Pit Mining - Lynx Geo

Pit Optimization. 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 …

### Whittle Consulting - Integrated Strategic Planning for the ...

Whittle Consulting - Integrated Strategic Planning for the ...

### Simultaneous Optimization Explained in GEOVIA Whittle ...

Jul 18, 2017· When GEOVIA Whittle was initially released in 1984, it provided a new Lerchs-Grossmann (LG) algorithm for open pit shell optimization to replace the existing floating cone method. While it took a number of years for the mining industry to become accustomed to LG, it is now the industry standard for pit optimization.

### Pseudoflow, New Life for Lerchs-Grossmann Pit Optimisation ...

Pseudoflow, New Life for Lerchs-Grossmann Pit Optimisation

### GEOVIA WHITTLE - Dassault Systèmes

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

### Pit Optimization and Pseudoflow ("Lerchs-Grossmann on ...

Mar 07, 2017· Pit Optimization and Pseudoflow ("Lerchs-Grossmann on Steroids" ) Published on March 7, 2017 March 7, 2017 • 141 Likes • 16 Comments

### Using the Lerchs-Grossman algorithm during open pit mine ...

Nov 18, 2012· This is a video showing how to get an optimum pit shell in DesignXL given the blockmodel and the face angle constraints. DesignXL is developed by PrimeThought Software Solutions.

### Open Pit Mine Design - in Excel with DesignXL - YouTube

Nov 29, 2012· A demonstration video showing how to do open pit mine design with DesignXL. DesignXL is a mine design tool which works inside Microsoft Excel 2007 or …

### An Approximate Pit Optimization Methodology Suited to …

An Approximate Pit Optimization Methodology Suited to the SLM Framework Miguel A. Cuba and Clayton Deutsch The calculation of the ultimate-pit is the base for designing the life-of-mine plan of a surface mining project. In industry, two widely popular methodologies to calculate the ultimate-pit limits are Lerchs and Grossmann and Floating Cone.

### Optimized open pit mine design, pushbacks and the gap ...

OPTIMIZED OPEN PIT MINE DESIGN, PUSHBACKS AND THE GAP PROBLEM—A REVIEW 511 JOURNAL OF MINING SCIENCE Vol. 50 No. 3 2014 Fig. 3. Graph G with dummy node x0 and arcs added from the dummy node x0 to all other nodes. It is clear from the definition of our graph G that a graph closure in G represents a physically feasible pit, if not, then a block not in our closure violating …

### Application of Surpac and Whittle Software in Open Pit ...

(1993), Lerchs-Gro ssmann method works with . only two types of information. ... This paper demonstrates the application of Surpac and Whittle in open pit optimisation …

### Pseudoflow explained - Deswik

Mar 08, 2017· A discussion of Deswik Pseudoflow Pit Optimization in comparison to Whittle LG Pit Optimization. The purpose of this paper is to inform the user about Deswik Pseudoflow, within the context of the mining industry's most accepted pit optimization process that uses Whittle software based on the Lerchs-Grossman (LG) algorithm.

### Mathematical Optimization Models and Methods for Open …

Amankwah, H. (2011). Mathematical Optimization Models and Methods for Open-Pit Mining. Doctoral dissertation. ISBN 978-91-7393-073-4. ISSN 0345-7524. Open-pit mining is an operation in which blocks from the ground are dug to extract the ore contained in them, and in this process a deeper and deeper pit is formed until the min-ing operation ends.

### Sue Bonham-Carter - Principal - Consultant Mining Engineer ...

Pit optimisation techniques based around the Lerch-Grossman algorithm (as used by Whittle software and others) have long been applied in metal mining applications – the complexities of determining optimum pit shells, sequencing and cut off grades with varying geology, grades, costs and geometry require such an approach.

### PSEUDOFLOW EXPLAINED - Deswik

software (Whittle Three-D), with another 10 years before it became a mainstream approach to open pit optimization. In the past 30 years, Whittle and the LG algorithm have become synonymous with the optimization of open pits, and now suffers from having become a generic term for the process of pit optimization– similar to the genericization of

### How To Do Plant Optimization Project Report

How To Do Plant Optimization Project Report. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore ...

### GEOVIA WHITTLE

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

### GEOVIA WHITTLE SIMULTANEOUS OPTIMIZATION

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 …

### An algorithm for the ages - CIM

Mar 28, 2018· Jeff Whittle was contracting with Newmont in Australia when he came across the Lerchs-Grossman paper. "I also read an article somewhere that said that the mining industry would love to use Lerchs-Grossman but it was 'too hard to program'," Whittle wrote to CIM Magazine recently. "In the early '70s Placer Dome had managed to get it working, but it was well known in the industry that ...

### Review of cut-off grade optimisation from Southern African ...

The Whittle Optimiser as well as the Lerchs-Grossman algorithm is applied for some of the open pit mines reviewed and the optimisation is focused on the NPV. Few, if any of the latest optimisation approaches, are found applied on the mines at operational level reviewed by this exercise.