Pit Design

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Surpac Minex Group Pit design in Surpac VisionJuly 2006

Copyright 2006 Surpac Minex Group Pty Ltd. All rights reserved. This software and documentation is proprietary to Surpac Minex Group Pty Ltd. Surpac Minex Group Pty Ltd publishes this documentation for the sole use of Surpac licenses. Without written permission you may not sell, reproduce, store in a retrieval system, or transmit any part of the documentation. For such permission, or to obtain extra copies please contact your local Surpac Minex Group Office. Surpac Minex Group Pty Ltd Level 8 190 St Georges Terrace Perth, Western Australia 6000 Telephone: (08) 94201383 Fax: (08) 94201350 While every precaution has been taken in the preparation of this manual, we assume no responsibility for errors or omissions. Neither is any liability assumed for damage resulting from the use of the information contained herein. All brand and product names are trademarks or registered trademarks of there respective companies. About This Manual This manual has been designed to provide a practical guide to the many uses of the software. The applications contained within this manual are by no means exhaustive as the possible uses of the software are only limited by the users imagination. However, it will give new users a starting point and existing users a good overview by demonstrating how to use may of the functions in Surpac Vision. If you have any difficulties or questions while working through this manual feel free to contact your local Surpac Minex Group Office. Author Rowdy Bristol Surpac Minex Group Perth, Western Australia Product Surpac Vision v5.1

Table of Contents

Introduction ................................................................................................................................ 1 Requirements ............................................................................................................................ 1 Objectives .................................................................................................................................. 1 Workflow .................................................................................................................................... 1 Pit Design Data Preparation ...................................................................................................... 2 Basic Pit Design Tools............................................................................................................. 18 Additional Pit Design Tools...................................................................................................... 39 Pit Design to Surface............................................................................................................... 49 Pit Design to Surface Model .................................................................................................... 60 Visualisation............................................................................................................................. 78 Waste Dump Design................................................................................................................ 90

IntroductionThis tutorial shows the procedures for generating Pit and Dump Designs using the Surpac Vision. The tutorial focuses on the use of the new `Pit design' functions first released in Version 3.1 of Surpac Vision, and which constitute a complete rewrite of the older `Pit and Dump' design tools. The result is a significantly higher level of flexibility, ease of use, as well as significantly higher levels of functionality throughout. Of particular note are that the Pit design give the user greater control over ramp to berm access, incorporate interaction with DTM surfaces and allow various options for conditional berm creation.

RequirementsThis tutorial is written assuming users have a basic knowledge of Surpac Vision. We recommend that Users be at least comfortable with the procedures and concepts in the Principles of Surpac Vision training manual. If you are a new Surpac Vision user, you should go through the Principles of Surpac Vision training manual before going through this manual. Prior to proceeding with this tutorial, you will need: Surpac Vision v5.1 installed The data set accompanying this tutorial

Objectives

The objective of this tutorial is to allow you to create a Pit Design. It is not intended to be exhaustive in scope, but will show the work flow needed to achieve a final result. You can then refine and add to this workflow to meet your specific requirements.

WorkflowThe process described in this tutorial is outlined below: Pit Design Data Presentation Basic Pit Design Tools Additional Pit Design Tools Pit Design to Surface Pit Design to Surface Model Visualisation Waste Dump Design

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Pit Design Data PreparationOverview In this section we will look at how to prepare the data required to design an open pit mine in Surpac Vision. Before starting a pit design you need to prepare data to guide the design. This data can be obtained from various sources and may be in various formats. This section will cover the topics listed below: Geology outlines Whittle outlines from the Whittle string file interface Whittle outlines from the Whittle-Surpac Block model interface Surpac Vision constrained Block models Natural surface data Geotechnical design constraints Mining fleet design constraints

Geological OutlinesThe purpose of this section is to review the basic data sources used in pit design. Start Surpac Vision and change the working directory to the pitdes training directory. To do this you can right click in the navigator pane and choose the change directory icon. The training data is supplied with Surpac Vision and can be installed as an option when installing the software. If the data is not installed, insert the Surpac Vision CD and run the install program. The data is installed by default into the directory \dem\training\pitdes. Open the file zon1.str in the graphics workspace by dragging it into Graphics. This file contains a range of geological slices taken through a solid of an ore body. Use the viewing function View Viewing planes, define viewing planes to define a viewing slice of the data. Select a viewing slice thickness of 10 metres. Use the viewing function View Viewing planes Step plane backwards and Step plane forwards to move the viewing slice through the data. Use the View Viewing planes and then Remove viewing / cutting planes to restore the initial view of the data. Geological outlines are a good source of information when performing pit design. They can be obtained from slicing a geological model (solid or wireframe) or taken from bench by bench interpretations.

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1. Whittle outlines from the Whittle string file interface In this section we will examine the basic data sources to be used in the pit design. In the last exercise we reviewed geological outlines that can be used as a guide in pit design. The outlines indicate the ore zones but may not be optimal for the removal of all these zones. The cost of processing the waste may outstrip the revenue obtained from the ore. Under Mining tools, Surpac Vision has an interface to Whittle 3D and 4D which allows the output of data from Surpac Vision to Whittle and the conversion of the Whittle results in Surpac Vision string files. Open the file whit16.str into a layer called whittle16. The following image will be displayed.

whit16.str is one of two Whittle output files we will use for the pit design. When viewing the file in graphics, you will see that it already forms the basis of a pit design. Open the file whit28.str into a layer called whittle28. Note: The option to replace or append will not have any effect because the files are in different layers.

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Type the word layers and press enter. The following form displays the layers that are active in memory:

You can control which layers are visible, selectable and active. Note that the active layer is the only layer that can be modified. Layers act like transparencies on a light table, with the layer on top being the only one you can draw on. An understanding of the layer functions in Surpac Vision is an important part of design work. You may want to use the two whittle files because they represent a two stage pit design. In this case, whittle16 will be mined first and then a cutback will be done to mine whittle28. Whittle28 is mainly an expansion of whittle16 to the south with only a little area remaining in the north that would not be practical to mine in the cutback. By comparing the two files during the pit design, any part of whittle28 to the north could be included in whittle16 and mined at the same time. From the File menu, select Reset graphics to clear all layers then return to graphics and open wmod915.str.

This file is a combination of whittle16, whittle28 and the geological outlines at the 995 elevation.

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2. Whittle Outlines from the Surpac Vision Block Model From the File menu, select Reset graphics. From the Block model menu, select Block model, then New/ Open. Enter the model name pitdesign and apply the form. From the Block model menu, select Block model, then Display and apply the form that is displayed. The Pitdesign block Model is now displayed. From the Block model menu, select Constraints then New graphical constraint file, enter the information as shown below and Apply the form.

Note the use of the constraint combination a or b which means a value must satisfy block constraint a or b, the default is a and b. In this case, if we used a and b we would get nothing as the block attribute pit number cannot satisfy both conditions.

Use the viewer to inspect the model when pit number attribute is returned from the Whittle optimization. The model you see is the same as the whit16.