Reserve Calculations Using MEDS file 18 Approach (Programs 710, 711, 712)

This approach requires you to perform the following steps in order:

1. Initialize File 18 (the material summary file) by running Program 710. This program requires the user to define the material categories he/she wishes to have the reserves broken down into. A maximum of 20 material categories are allowed.

A maximum of two block model items can be used to categorize the reserves.

These block model items must have integer values (i.e., ore code, rock code, ownership code, alteration code, etc.). For each material category defined, up to 10 different cutoff grades for reserve tabulation can be specified.

2. Compute block partials using Program M659V1. This program determines the percentage of each block that is inside the pit outline and outputs the percentage to an ASCII file. Blocks completely inside (i.e., 100%) the pit outline are accounted for by default and not written to the file. Blocks cut vertically by the pit outline have the percentage inside calculated and dumped to the file along with bench, row, and column numbers for the block. This program must be run once for each pit or phase for which reserves are being calculated.

3. Determine Reserves between Current Topo and Each Pit Surface using Program 711. This program tabulates reserves on a bench-by-bench basis. It uses the material categories and cutoff grades defined in Step A and stored in File 18.

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4. Determine reserves between two pit surfaces. Use Program M712. This program gives you the opportunity to combine the previously defined material categories into reserve classes based on cutoff grade (i.e., low grade material, mill grade material, etc.). We will now follow this four-step procedure and compute reserves for the Starter pit (feature code 802), an intermediate pit (feature code 804), and the final pit (feature code 808).

Step 1 - Initialize the Reserves Summary File

Access Program 710 through the MSCompass Menu tab by selecting:

Group: Pit Design Operations: Initialize

Procedure: Initialize Reserve File (Pit Design) - p71091.dat Panel 1 - Pit Design Polygon Reserve Logic

This panel is mostly informative, but also accepts entry of the name for the Reserve Summary File. <Enter MSOP18.DAT for Name of Material Reserve Summary File.>

Panel 2 - Pit Design Polygon Reserve Logic

On this panel, we specify the model items we wish to use to classify reserves with (in this case ORE and ZONE); use 4 as both default and maximum value for ORE, and a default of 1, maximum of 2 for the item ZONE. Specify the grades we wish to report (CUIDS and MOIDS). The primary grade is the one for which cutoff grades will be specified on the next panel.

Panel 3 - Pit Design Polygon Reserve Logic

On this panel, we list the Material classifications and cutoff grades we want the reserves broken up into. The Material Classifications must be related to the model items ORE and ZONE, which we specified in the previous panel. In this case ORE is an integer code for proven, probable or possible ore and ZONE is an integer code for ownership (owner 1 or owner 2). Use the table below to fill in the panel windows.

Material Class * Cutoff grades for the material class *

# Label (separate each cutoff with a blank or a ,)

+->10-char +--> Enter ALL CLASS CUTOFFS in this field +-> or enter –1 TO COPY previous cutoffs

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Panel 4 - Pit Design Polygon Reserve Logic

On this panel, we associate the values of ORE and ZONE with the Material Class Number we defined in the previous panel. ORE values 1 - 4 define the columns of the matrix table, ZONE values 1 - 2 define the rows of the matrix table, and the associated Material classification numbers define the Matrix table entries. (These are the numbers you enter.)

Panel 5 - Pit Design Polygon Reserve Logic

In this panel, the density for each ore type is specified - we’ll use a default Specific Gravity of 2.7 for all four ore types. An alternative is to use the specific gravity values stored on a block-by-block basis in the model. Note that this program initializes MSOP18.DAT as your File 18, but it will not list it on the Setup tab of Compass.

Step 2 - Compute Block Partials

Access the pit partials Calculation program (M659V1) through the MSCompass Menu tab by selecting:

Group: Pit Design Operations: Data Convert

Procedure: Calculate 3D Block Partials - p65901.dat Panel 1 - Table of Pit Design Polygons

This panel provides the user with a list of pit surface VBM features and their associated reference number and description. This information is not used directly by

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On this panel, you are asked to enter the source file ( msop25.top), pit feature code, the bottom and top elevation for the feature and the bench height. We will run this program three times. The information for this panel for each run is shown below:

Feature

You can do all three runs at once, using the Multi-Run function found on the MSCompass Options tab. Try this.

Step 3 - Determine reserves between TOPO and Pit Surface

Access Program 711 for reserve calculations between the original/current surface, and a pit surface by selecting:

Group: Pit Design Operation: Report

Procedure: Reserves (Pit Design) - p71101.dat Panel 1 - Table of Pit Design Polygons

This panel displays the information associating pit feature VBM with reference number. This is presented as a reminder of the association you wish to establish in the

The pit design outlines should go up until they are completely in air. A bottom elevation below pit bottom can be entered and the program will flag any benches without an outline with a warning message. Rather than try to remember the top and bottom of each pit, just use the model limits on elevation for all pits.

This program produces an ASCII file of the partial block percentages and the location of the blocks. The file naming convention used by the program is PRT***.ASC, where

*** is the Pit feature code. In this case, we will create files PRT802.ASC,

PRT804.ASC, and PRT808.ASC. A partial listing of the file PRT802.ASC is shown below:

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Panel 2 - Pit Design Polygon Model Reserves

On this panel, the VBM pit feature, Reference number, and Partials file all come together for a particular pit surface. Since the reserves are by default, always calculated from the original/current surface, you are only asked for the pit surface to which you wish to sum reserves. We will run this program three times with the input to Panel 2 as shown below, using the Reserve Summary File msop18.dat. (If you want to use Multi-Run for this, go ahead.)

808 3 PRT808.ASC RPT711.808

After running this program, the reference number and the pit surface feature code are linked together, so be sure that the Partials file, reference number, and pit feature all relate to the same surface before running this program. This program stores in File 18, the bench-by-bench reserves between the original/current topo and the particular pit surface.

Step 4 - To calculate reserves between pit surfaces, access program 712 by selecting:

Group: Pit Design Operation: Report

Procedure: Summarize Reserves Panel 1 - For Your Information

This information panel presents a message concerning what you need to know, and what you should have completed before attempting to run this program. The key facts we need to know are:

A. We specified eight Material Classes when initializing File 18 in Step 1. These are:

1. Proven Ore - Owner 1 2. Proven Ore - Owner 2 3. Probable Ore - Owner 1 4. Probable Ore - Owner 2 5. Possible Ore -Owner 1 6. Possible ore - Owner 2

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B. We specified four cutoff grades when initializing File 18. These are:

1. 0.00 (Automatically included by MineSight) 2. 0.30

3. 0.60 4. 1.00

Programs that must be run before running this program, are the programs we have run in the previous three steps.

Panel 2 - Table of Pit Design Polygons

This panel displays the information associating VBM pit feature and reference number.

Panel 3 - Reserves Summary

Here we must specify the filename for File 18 ( MSOP18.dat), and the reference numbers of the two surfaces between which we want to calculate reserves. We will run the program three times to determine reserves between the following surfaces and their corresponding reference numbers. (If you want to use Multi-Run for this, go ahead.)

Large “pit” Ref # Small “pit” Ref # Report file

The res files created are input files to the scheduling program 805, which we will use in the next section.

Panel 4 - Reserves Summary

This panel asks the user to define “Reserve Classes”, and specify which are to be considered ore and which are to be considered waste for strip ratio calculation purposes.

Reserve classes are simply categories where you mix and match the Material Classes and cutoff grades to produce different reserve reports. The reserve classes are not stored in File 18 and you can run as many different reserve reports as you want. The key is to have defined your Material Classes and cutoff grades (Step 1) in enough detail to give you the flexibility needed for different reserve reports now.

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For this example, we will report the ore as either low grade (below .6%), or high grade (no breakdown by proven, probable, or possible) for each owner, and report waste as one item regardless of owner. Thus, we have the following five reserve classes:

No. 10-Character 5 Waste Waste - No Owner Breakdown

Panel 5 - Pit Optimization Reserves Summary

On this panel, we associate the Cutoff grades and Material class Numbers with the Reserve Class Numbers we defined in the previous panel. Cut-off grade numbers 1 - 4 ( for 0% , .3%, .6%, and 1% respectively) define the columns of the matrix table, Material Class Numbers 1 - 8 define the rows of the matrix table and the associated reserve class numbers define the Matrix table entries. (These are the numbers you enter). Note: you must fill in all eight Material Classes; this requires a single entry on the following panel (5 5 5 5).

712 Output

This program produces two output files each time you run it: the RPT file and RESn2.n1 file where n2 = reference number of Larger Pit, and n1 = reference number of Smaller Pit.

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Exercise

The Multi-Run function of MSCompass can be used to run multiple procedures multiple times. Set up a Multi-Run package to do the pit partials, 711 reserves and 712 reserves that we just did, all at once.