COMPBR Process
To access this process:
- Sample Analysis ribbon >> Prepare Samples >> Composite >> Composite With Recovery.
- View the Find Command screen, select COMPBR and click Run.
- Enter "COMPBR" into the Command Line and press <ENTER>.
See this process in the Command Table.
Process Overview
Composites drillhole data over horizontal benches, with additional computation of a recovered grade and recovered fraction for a specified field at a given cut-off.
The COMPBR process is a modification of the COMPBE process, and composites in an identical way. The difference comes in the recovered grade and fraction calculations. For the specified field *VALUE, the weighted FRACTION of each composite above the given parameter @CUTOFF is computed, together with the mean grade REC.VAL of this fraction. These values relate to those that could be achieved with selective mining within benches at the specified cut-off.
Further details of the compositing process are given in the COMPBE description.
The file must be in the order of BHID and FROM, i.e. sorted in drillhole order in increasing downhole distance. This is the order output from the DESURV process.
Note: A progress message is displayed for every 500 samples read.
Weighting by density
If a density field exists in the file then this may be used too for density weighted compositing. The density field is defined as the optional field *DENSITY. If any density value is absent data then the default density value will be used.
Weighting by core loss or recovery
To include the effects of core loss, the user may specify one of two optional fields *CORELOSS (core loss as a percentage) or *COREREC (core recovery as a percentage) to be used during compositing. The lost portion of the core will be taken into account and used in compositing. The actual treatment depends on the optional @LOSS parameter. If @LOSS<=0 (default) then the lost part of the core will be assumed to have exactly the same grades, properties etc. as the recovered part; in other words, the core loss is ignored. If however @LOSS= 1 then the lost core will be assumed to have default grades, density, properties etc. which will be averaged with the recovered core values.
If @LOSS>=2 then the lost core will be treated as cavity (zero density and grades) so that the grade of the total sample is effectively reduced by the cavity.
Input Files
|
Name |
Description |
I/O Status |
Required |
Type |
|
IN |
Sample data file, sorted on BHID and FROM. Expects fields BHID, FROM, TO, LENGTH, X, Y, Z, A0, B0. |
Input |
Yes |
Drillhole |
Output Files
|
Name |
I/O Status |
Required |
Type |
Description |
|
OUT |
Output |
Yes |
Drillhole |
Composite file. Will include implicit field CUTOFF and explicit fields REC.VAL and FRACTION for recovered values. |
Fields
|
Name |
Description |
Source |
Required |
Type |
Default |
|
VALUE |
Field for recovered grade computations. |
IN |
Yes |
Numeric |
Undefined |
|
BHID |
Drillhole identifier. |
IN |
No |
Any |
BHID |
|
FROM |
Downhole distance to sample top. |
IN |
No |
Numeric |
FROM |
|
TO |
Downhole distance to sample bottom. |
IN |
No |
Numeric |
TO |
|
DENSITY |
If present, composites will be density-weighted |
IN |
No |
Numeric |
DENSITY |
|
CORELOSS |
If present, will be taken as percentage core loss, and treated according to the LOSS parameter. |
IN |
No |
Numeric |
CORELOSS |
|
COREREC |
If present, will be taken as percentage core recovery, (100-core loss) and treated according to the LOSS parameter. |
IN |
No |
Numeric |
COREREC |
|
ZONE |
Name of field for compositing within. (may be numeric or up to 4 character alpha). This field must exist in the IN and will be copied to the OUT file. If specified then new composites will be created each time the value of ZONE changes. |
IN |
No |
Any |
Undefined |
Parameters
|
Name |
Description |
Required |
Default |
Range |
Values |
||||||||
|
INTERVAL |
Bench height. |
Yes |
Undefined |
Undefined |
Undefined |
||||||||
|
CUTOFF |
Cutoff to be applied to VALUE. |
Yes |
Undefined |
Undefined |
Undefined |
||||||||
|
MINGAP |
Gap length to be ignored. The default gap is calculated as 0.05 INTERVAL. This default value is applied if the parameter is not specified, or if the value is specified as <=0. A gap of exactly zero is not permitted. If you want the composite to be split at every gap, use a very small value for MAXGAP eg 0.0001. |
No |
Undefined |
Undefined |
Undefined |
||||||||
|
MAXGAP |
Gap length for termination of composite (0). |
No |
0 |
Undefined |
Undefined |
||||||||
|
ELEV |
Reference bench elevation (0). |
No |
0 |
Undefined |
Undefined |
||||||||
|
MINCOMP |
Minimum composite length [0.5 INTERVAL]. |
No |
Undefined |
Undefined |
Undefined |
||||||||
|
MAXCOMP |
Maximum composite length [2.0 INTERVAL]. |
No |
Undefined |
Undefined |
Undefined |
||||||||
|
LOSS |
If core loss or core recovery field is present, controls how it is handled:
|
No |
0 |
0,2 |
0,1,2 |
||||||||
|
|
>2 to display each composite and output file DD (0). |
No |
0 |
0,2 |
0,1,2 |
Example
!COMPBR &IN(BHOLES.D), &OUT(COMPSR.4), @INTERVAL=4,
@ELEV=35,
@CUTOFF=0.5, *VALUE(CU)
>>> 170 SAMPLES INPUT <<<
>>> 67 COMPOSITES OUTPUT <<<
Error and Warning Messages
|
Message |
Description |
|
>>> ERR 122 <<< ( fileno) IN COMPBR |
Missing essential fields in input sample file or there are more than 20 explicit numeric data fields for compositing. Fatal; the process is exited. |
|
>>> ERR 124 <<< ( fileno) IN COMPBR |
The composite length specified in @INTERVAL is negative or zero. Fatal; the process is exited. |
|
>>> ERR 130 <<< ( 0) IN COMPBR |
The maximum acceptable composite length specified in @MAXCOMP is less than the required composite length specified in @INTERVAL. Fatal; the process is exited.
|
|
>>> ERR 131 <<< ( 0) IN COMPBR |
The maximum acceptable composite length specified in @MAXCOMP is less than the minimum acceptable composite length specified in @MINCOMP. Fatal; the process is exited.
|
