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REGMOD - produce a regular celled block model suitable for pit Optimization

 

Process Name

Menu Path

Link to Command Table

REGMOD

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Introduction

Produces a regular cell model from any type of Datamine ore body block model.

The parameters for the output regular cell model are taken from the prototype model &IN1. The model to be converted is &IN2. The regular model is output to &OUT.

How to use

The prototype model may be constructed by using the PROTOM process. Any number of cells and any cell size may be chosen; REGMOD computes a weighted average of all input cells and sub-cells falling within the new cell size. However, it is better to choose a multiple or sub-multiple of the input cell size whenever possible, with the new origin chosen so that as many cell boundaries coincide between the old and new models as possible.

 

The output model will usually have larger cells than the input. However, REGMOD will also allow the input model to be divided into smaller cells, if required. Note however that values are always output for whole cells only; sub-cells will not exist in the output model.

 

The output model will contain two extra fields; FILLVOL, which is the total volume in the output cell filled by cells and sub-cells in the input model; and VOIDVOL, which is the total cell volume minus FILLVOL, or the total volume of the output cell which was not covered by cells and sub-cells.

 

Up to 25 numeric fields from the input model are averaged and placed in the output model. These

fields are specified as field names *F1 to *F25. Averaging is by volume weighting. There must

be at least one numeric value field in the input model (*F1).

 

It should be noted that absent grade values are treated as ZERO when regularizing. For example  if a cell is divided into two equal subcells of volume 500 each and the AU value in one subcell is 1, and - (absent data) in the other, then the regularised AU value over the parent cell is calculated as 0.5, the FILLVOL as 1000 and the VOIDVOL as 0.

 

However if the subcell with absent data is removed, leaving just one subcell, then the regularized AU value is 1, the FILLVOL is 500 and VOIDVOL is 500.

 

This treatment of absent data values has been designed specifically for calculating the revenue value of a cell in the regularized model, using a process such as EXTRA. For example if the revenue for a unit of AU is $100 then the dollar value is calculated as:

 

revenue = FILLVOL x grade x $value

  • Case 1: revenue = 1000 x 0.5 x 100 = 50,000

  • Case 2: revenue = 500 x 1.0 x 100 = 50,000
     

If REGMOD is used for other purposes then the implication of this treatment of absent data grade values should be considered carefully.

Files, Fields and Parameters

Input Files

Name

Description

I/O Status

Required

Type

IN1

Input model prototype file, defining the new model origin, number of cells and cell sizes. This is typically set up by process PROTOM or create-model-prototype.

Input

Yes

Block Model Prototype

IN2

Input model file for conversion. This must have the fields XMORIG, YMORIG, ZMORIG, NX, NY, NZ (implicit) and IJK, XC, YC and ZC (explicit). XINC, YINC and ZINC must exist as either explicit (sub-cells permitted) or implicit (no sub-cells). There must also be at least one explicit numeric data field, to be specified as F1. The records may be in any order, but speed is increased if they are in IJK order.

Input

Yes

Block Model

FIELDLST

File to supply selected fields.

Input

No

Undefined

Output Files

Name

I/O Status

Required

Type

Description

OUT

Output

Yes

Block Model

Output model file. This will have the model parameters of the input prototype file on IN1 , and may contain up to twenty five averaged fields ( F1-F25). It will also contain the fields FILLVOL and VOIDVOL.

Fields

Name

Description

Source

Required

Type

Default

F1

First explicit numeric field to be averaged.

IN2

No

Any

Undefined

F2

Second explicit numeric field to be averaged.

IN2

No

Any

Undefined

F3

Third explicit numeric field to be averaged.

IN2

No

Any

Undefined

F4

Fourth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F5

Fifth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F6

Sixth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F7

Seventh explicit numeric field to be averaged.

IN2

No

Any

Undefined

F8

Eighth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F9

Nineth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F10

Tenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F11

Eleventh explicit numeric field to be averaged.

IN2

No

Any

Undefined

F12

Twelfth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F13

Thirteenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F14

Fourteenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F15

Fifteenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F16

Sixteenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F17

Seventeenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F18

Eighteenth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F19

Nineteenth explicit numeric field to be averaged. F6 to F25 may also be specified.

IN2

No

Any

Undefined

F20

Twentieth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F21

Twenty-first explicit numeric field to be averaged.

IN2

No

Any

Undefined

F22

Twenty-second explicit numeric field to be averaged.

IN2

No

Any

Undefined

F23

Twenty-third explicit numeric field to be averaged.

IN2

No

Any

Undefined

F24

Twenth-fourth explicit numeric field to be averaged.

IN2

No

Any

Undefined

F25

Twenty-fifth explicit numeric field to be averaged.

IN2

No

Any

Undefined

FIELDNAM

Field in FIELDLST to identify selected fields.

FIELDLST

No

Character

Undefined

Parameters

Name

Description

Required

Default

Range

Values

PRINT

>=2 display for each input cell or sub-cell that intersects with an output model cell; IJK1,IJK,NUMMET,XC,YC,ZC,VOLP,VOLT,F1 [IJK of input and output cell, sub-cell no., input cell centre, volume intersected, total volume to date in output cell, F1 value] and for each output cell, IJK, FILLVOL and VOIDVOL values, and the F1 value. (0).

No

0

0,2

0,1,2

Notes

No additional notes.

Example

!REGMOD     &IN1(PROTMODL),&IN2(OLDMODEL),&OUT(LGMODEL),*F1(DOLLARS)

Error and Warning Messages

Message

Description

Solution

>>> NO NUMERIC FIELDS TO ACCUMULATE.

One or more of the given field names (*F1-*F25) did not exist, or were implicit, or not numeric. Fatal; the process is exited.

 

 

 

 

>>> ERR 122 <<< ( n) IN REGMOD

One or more of the essential fields in either the prototype or input model file was absent.
Fatal; the process is exited.