10.0 MicroMODEL POLYMAP INTERFACE

10.1 Introduction

The PolyMap Interface Sub-Menu appears below:

  1. Return To Main Menu
  2. Command Shell
  3. Define Slope Template File for PolyMap Pit Design
  4. Create Block Grade File for PolyMap Pit Design
  5. Export Cone Contours to PolyMap map (or to file)
  6. Prepare Files for Waste Dump Design in PolyMap
  7. Prepare Files for Reserve Calculation in PolyMap

This module gives the user access to five separate programs that are used to create work files for the PolyMap digitizing system. PolyMap is an interactive graphics program that allows the user to quickly and efficiently design open pit mines.

10.2 Command Shell

This menu choice enables the user to invoke commands and run external programs without exiting MicroMODEL. This program is simply a command shell. The user enters as many commands as desired. Type "EXIT" at the command prompt to return to MicroMODEL.

10.3 Define Slope Template File for PolyMap Pit Design

This menu choice runs the program that allows the user to define one of three slope template definition files that can be used by the PolyMap pit digitizing program (PDIG).

Prior to running this program, the user must have created a 3-dimensional rock model file with MicroMODEL, and must also have initialized the pit model and defined the pit expansion in the Open Pit Design (OPD) parameter definition, and must have entered appropriate pit slope angles for each rock type. The user should enter a slope angle for air that is 10-15 degrees greater than the steepest angle used for expansion of any of the rock types. This air slope angle should not exceed 89 degrees under any circumstances. The recommended value for the slope angle of air blocks is 85 degrees.

The slope angles are used to define the horizontal projection distances that are used when expanding pit contours. For each point along a pit contour line that is to be projected, the pit design program determines which block in the 3-D rock model contains that point. The projection angle assigned to the rock type is then used for the pit slope angle.

In addition to the fixed slope angles, the user can also specify catch bench widths that are added to the horizontal projection distance. A different catch bench width can be specified for each bench in the model.

As an example, suppose that a pit contour is being projected from level 10, from a block that is rock type 7. If the pit angle for rock code 7 is 48 degrees, and the bench height is 20 feet, then the horizontal projection distance will be 20/tan(48), or 18.01 feet. In addition, if a catch bench width of 20 feet had been specified for level 10, then the total horizontal projection distance would be 20+18.01, or 38.01 feet.

Note that for downward projections, if the level below the level being expanded has a catch bench width specified, then that width is added to the horizontal expansion distance.

Because of design limitations, the horizontal expansion distance per foot of vertical expansion must never exceed 32.7 feet. This limit should never be reached in any reasonable situation.

10.4 Create Block Grade File for PolyMap Pit Design

This program creates two files that enable the PolyMap pit design program to display colored grade block outlines on the current layer (bench). The main data file created is called PZGRADE.DAT, and it contains the symbol type and color to display for each block in the 3-D grade model. The second file, PZGRADE.PCF, tells PolyMap the block model limits that apply to the grade model, and also defines the size of the symbols that are plotted.

Note: The PolyMap interactive pit design program has been updated so that it can now accept multiple bench plots as a background display. For example, you may now create a multiple bench plan view cell plot showing colored background and block grades and use this file in lieu of the block grade file created by this PolyMap interface program. In order for the layering function to work, your plan view cell plot must contain at least two levels. You may create a combined plot containing block grades plus composite intercepts, and then use this combined plot as a background display.

Any grade model can be used as input to this program. The user can, for example, display a gold grade model, a money matrix, or any manipulated model. The program requires that the user also have a 3-D rock model.

To run the program, the user specifies the block color and symbol to use for each rock type at a specified set of grade cutoff ranges. It is recommended that all waste blocks be assigned color 0 (blank) so that they are not displayed. This speeds up replots, zooms, and windows.

As an example, assume there are three rock types that represent oxide, mixed, and sulfide. Also assume that we want to display different colors for 5 cutoff ranges.

The user can select circle to represent blocks that are oxide, a diamond to represent blocks that are mixed, and a square to represent blocks that are sulfide. Then, the following color assignments can be made for each cutoff:

    Au >=0.15 	color  [6] Green
    Au >=0.10 	color  [3] Cyan
    Au >=0.07 	color  [5] Yellow
    Au >=0.05 	color [10] Grey
    Au >=0.02 	color  [4] Red
    Au  <0.02 	color  [0] (do not plot)

The user may specify a directory path that is used to write the work files directly into the PolyMap directory, if desired. Leaving this field blank causes the work files to be written into the current MicroMODEL project directory.

Note that after running this program, if the PolyMap files for the user's project are stored in a different subdirectory than that of the PolyMap project, then the files PZGRADE.DAT and PZGRADE.PCF must be copied or renamed into the PolyMap subdirectory.

This program creates a print file "MAKCNF.PRN" that can be printed for reference.

10.5 Export Cone Contours to PolyMap map (or to file)

This program allows the user to contour a cone surface and output the contour lines either directly to a pre-defined PolyMap map, or into an ASCII POLY.CNT type file. The POLY.CNT file can then be read into PolyMap. Note that it is much easier to just export the contours directly into a PolyMap map. The map is then used as a background template for use in designing a final pit design with ramps.

The use selects the various parameters (contour interval, offset, etc.) just as they would be chosen to make a hard copy plot of a contour surface. However, instead of creating a plot file, the program either writes these contours directly into a PolyMap map, or it creates a file that is in the same format as MicroMODEL's POLY.CNT file. Refer to Section 2.9.5 for details.

Any prior contents of the PolyMap map are deleted, so care should be used when running this program.

If the user has not written directly to a PolyMap data file (map), then after creating the POLY.CNT file, the user must run the PolyMap program to IMPORT DATA and add the contents of the POLY.CNT file into a standard map file.

Then, in order to display the cone contour map as a design template, the user must select the map as a background phase using the PHASE pulldown menu.

10.6 Prepare Files for Waste Dump Design in PolyMap

This program enables the user to create one of five sets of pairs of work files which are necessary for using PolyMap to design a waste dump, and to calculate waste dump volumes.

First, the program creates a slope template file that is similar to the one described in section 10.3. The only difference is that this template has only two expansion angles. One angle is the angle of repose for the dump material and it is stored in all blocks that are totally above the design starting surface. The other angle is the angle to use when expanding downwards through solid material. This second angle is normally set to 85 degrees.

The program also creates a topography grid file (PZTOPOn.DAT) and associated rotation parameter file (PZTOPOn.PCF) that are used in calculating volumes with the WDVOL command. The topo grid file is normally based on the starting surface file for MicroMODEL (T200), but can come from any cone surface file as well.

  (Note: n = file pair number)

The user may specify a directory path that is used to write the work files directly into the PolyMap directory, if desired. Leaving this field blank causes the work files to be written into the current MicroMODEL project directory.

10.7 Prepare Files for Reserve Calculation in PolyMap

This program enables the user to create one of five reserve calculation control files which are necessary for using PolyMap to report reserves for a given pit design.

The user must first initialize the OPD pit and enter pit design parameters through the pit design module. The appropriate OPD answerset is chosen at the beginning of input.

The user may define up to five different ore categories to report. Waste is reported in all cases and is always implied as category zero. For each category, a name is entered, and a box is checked/unchecked depending on whether the material counts/doesn't count as ore in the waste to ore ratio calculation.

A total of five different reserve calculation control files can be created for use by PolyMap. The user must select which set is being created by this run. PZGRDRPn.DAT is the name of the file which is created, where n is a single digit from 1 to 5.

A check box is used to select whether or not tonnages are reported in thousands. Usually, for a typical copper mine, tons will be reported in thousands. For smaller operations, it may be desirable to report actual tons.

A second check box allows the user to elect whether or not to ignore mined out flags in the rock model file (R200). If the R200 file (OPD model) contains negative values, that is, blocks that have been "mined" by OPD, then this option is significant. Check the box to ignore the mined out flags. Otherwise, leave the box unchecked to honor the mined out codes. One reason to honor the codes would be if the user is designing a new pushback from the current ultimate pit design.

The directory (folder) in which the grade calculation control file should be written is selected via an edit field. The user can either manually enter the full directory name, or use the "Access Directory" button to use the Windows file manager dialog to choose the directory. If the directory field is left blank, then the control file is written to the current MicroMODEL working directory and the user is responsible for copying it to the PolyMap directory. The control files are small ASCII (text) files containing the names of the grade model files, the rock file, OPD information, and ore category matrix.

Finally, the user specifies which category name to assign for each rock code and cutoff range combination.