Process Help

UNIFCOND performs Uniform Conditioning.

Process Name	Menu Path	Link to Command Table
UNIFCOND	Available as part of the Uniform Conditioning Wizard	Click here

Introduction
Files, Fields and Parameters
Example
Errors

Introduction

Performs the process of Uniform Conditioning (UC).

UC is a non-linear estimation technique which is used to determine the distribution of SMU grades above specified values (cut-off-grades), inside a panel. The principle of the tool is that data exists to accurately estimate grade at a larger resource-level “panel” scale - but - you cannot accurately estimate the selective mining unit (SMU). This is more likely to be the case where sample data is limited, which is often the case at the start of operations such as during the exploration phase of a project. Linear estimation at this stage will commonly have the effect of smoothing estimates and displaying an apparent loss of ore and metal tonnage at high cut-off grades.

It is implemented interactively via the Uniform Conditioning Wizard.

Files, Fields and Parameters

Input Files

Name	Description	I/O Status	Required	Type
SAMPLES	A Datamine file that contains sample positional information and supporting attributes.	Input	Yes	Undefined
VGRAM	A Datamine experimental variogram parameter file	Input	Yes	Undefined
INFOEFF	You can (optionally) incorporate the information effect to the estimation of the grade tonnage curves: during the production stage, the actual grades are recovered and may then be taken into account so the decision between ore and waste is made upon more accurate estimates of the SMUs. Therefore you can anticipatefuturedecisions before obtaining the production blast-holes results, because only the kriging variance of these SMUs final estimates is necessary.	Input	No	Undefined
PANMODEL	A file containing the panel model to be conditioned.	Input	Yes	Undefined
CUTOFF	A file specifying variably-spaced cut-off values. The file should contain a field titled CUTOFF, which is a list of values to use instead of those in CUTMIN, CUTINT and CUTNUM. If @CUTOFF is specified, CUTMIN, CUTINT and CUTNUM parameters will be ignored.	Input	No	Undefined

Output Files

Name	I/O Status	Required	Type	Description
UCMODEL	Output	Yes	Undefined	The output file containing the uniform conditioned panel model.

Fields

Name	Description	Source	Required	Type	Default
GRADE	The grade field (present in the samples file) that will be considered during the process of Uniform Conditioning.	IN	Yes	Alphanumeric	Undefined
WEIGHT	An optional weighting field.	IN	No	Alphanumeric	Undefined
KRIGING	The field in the input (panel) model containing kriged values to be conditioned.	IN	Yes	Alphanumeric	Undefined
DISPVAR	The field in the input (panel) model containing kriging variance data.	IN	Yes	Alphanumeric	Undefined
ERRCODE	The field in the input model containing error code information, if present.	IN	No	Alphanumeric	Undefined

Parameters

Name	Description	Required	Default	Range	Values
VREFNUM	A reference number relating to an experimental variogram as defined in VGRAM	No	0
DISCX	Number of discretisation points in X direction as used for calculating the covariance of a cell with each of the surrounding samples. This is then used in calculating the kriging weights.	No	5
DISCY	Number of discretisation points in Y direction	No	5
DISCZ	Number of discretisation points in Z direction	No	5
NORMSILL	If @NORMSILL=1 then the input variogram needs to be normalized by the process If @NORMSILL=0 then the input variogram model does not need to be normalized by the process	No	0	0,1	0,1
CLASSES	Number of panel classes	No	1
CUTMIN	The minimum cutoff grade to be considered during Uniform Conditioning	No	0
CUTINT	The size of each grade cutoff interval	No	10
CUTNUM	The number of grade cutoff intervals to considered during Uniform Conditioning	No	10
NUMSMUX	Number of selective mining units (per panel) in the X direction	No	1
NUMSMUY	Number of selective mining units (per panel) in the Y direction	No	1
NUMSMUZ	Number of selective mining units (per panel) in the Z direction	No	1
GAOUT	Set to 1 to include grade-above cutoffs in the output model. Set 0 to exclude grade-above cutoffs which allows 50% more cutoff intervals to be specified.	No	1	0,1	0,1

Example

!UNIFCOND &SAMPLES(samples), &VGRAM(vgram1), &PANMODEL1(pan_mod), &SMUMODEL(SMU_mod)

*GRADE(AU), *KRIGING(OK), *DISPVAR(DISP), @CUTMIN=0, @CUTINT=0.5, @CUTNUM=48, @DISCX=5, @DISCY=5, @DISCZ=5, @NUMSMUX=4, @NUMSMUY=4, @NUMSMUZ=4,

Error Codes

Code	Description
0	No tonnage correction was applied, all grades are consistent with the model
1	A tonnage correction has been applied and grades are still consistent with the model
2	A tonnage correction has been applied which has led to grade inconsistencies. This could be due to either: a mean grade below the specified cut-off the grade of an interval is not lying between two cut-off values
3	The difference between the panel grade and the grade calculated at the zero cut-off is larger than 1/10000, so that all metal quantities have been normalized before calculation.
4	The backtransformation of the panel's Kriged Value was not possible to calculate because the value falls outside the expected (Zmin, Zmax) interval of the model. All block/SMU values within such a panel are considered equal to the Kriged panel value Z to ensure that grades remain consistent within the model

	Related Topics
	UC Wizard - Introduction