Process Help MINWID - composite drillhole data into ore and waste intervals by mining width criteria.

 

Process Name	Menu Path	Link to Command Table
MINWID	Access using command line only	Click here

 

• Introduction

• Files, Fields and Parameters

• Notes

• Example

• Errors

Introduction

Composites drillhole data into ore and waste intervals that satisfy the specified mining width criteria.

How to use

The input file must be in standard sample format (as output by process HOLES3D). The input 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 HOLES3D process. The output file is in standard drillhole format supplemented with the VALUE and DENSITY field. The initial classification of ore and waste is based on whether a specified numeric field in the input file is above or below a specified cutoff.

The contiguous intervals of like samples make up either 'narrow' or 'wide' ore, or 'narrow' or 'wide' waste. If the ore interval is greater than the minimum ore width, then the ore is 'wide'. If the waste is greater than the minimum waste width, then the waste is 'wide'. 'Narrow' ore and waste intervals must be recombined to satisfy the mining width criteria. If 'narrow' ore cannot be recombined with other ore intervals, the option to dilute with adjacent waste is allowed. To allow minimum dilution of 'narrow' ore intervals from adjacent waste a dilution splitting interval can be specified.

Although the ore body orientation is not explicit in the drill hole data, dilution can be added to hanging and/or foot wall contacts. A constant relationship between ore body and hole orientation is assumed, with the dilution width specified as a positive distance up and down the drill hole from an ore interval. An interval file is output to provide a convenient summary of ore intervals, dilution components,and additional material above cutoff that fails to meet the specified criteria. In additional to BHID, FROM and TO fields other category fields output to flag the interval status:

• CATA - flags intervals that together satisfying all mining width criteria

• CATB - flags intervals that fail the mining width criteria when wall dilution is added

• CATC - flags above cutoff material that fails the minimum ore width criteria

• CATD - flags the below cutoff material in mining intervals (1 - from DILP. 2 - from DILN, 3 -other internal waste)

---

Files, Fields and Parameters

Input Files

Name	Description	I/O Status	Required	Type
IN	Input sample file, in BHID and FROM order.	Input	Yes	Drillhole

Output Files

Name	I/O Status	Required	Type	Description
OUT	Output	Yes	Drillhole	Output file of composites in standard
INTERVAL	Output	Yes	Undefined	Output file of composite interval and dilution types.

Fields

Name	Description	Source	Required	Type	Default
VALUE	Value which is to control compositing. This may be a grade or a calculated equivalent value from grades of different metals.	IN	Yes	Numeric	Undefined
DENSITY	Density field.	IN	Yes	Numeric	Undefined

Parameters

Name	Description	Required	Default	Range	Values
CUTOFF	Minimum value of VALUE which is worth mining (0).	Yes	0	Undefined	Undefined
MINORE	Minimum mining width for ore.	Yes	Undefined	Undefined	Undefined
MINWASTE	Minimum width for internal waste (0).	Yes	0	Undefined	Undefined
DILUTE	Allow dilution of composites to create minimum ore width if non-zero (1).	Yes	1	0,1	0,1
NARWAST1	Test for carrying narrow waste to be applied to either [1] or both [2] adjacent wide ores (1).	Yes	1	1,2	1,2
NARWAST2	Allow narrow waste to be expanded into adjacent wide ore to meet the minimum waste width if non-zero (0).	Yes	0	0,1	0,1
DILP	Dilution interval added to the ore composite in the down hole direction (0).	Yes	0	0,+	Undefined
DILN	Dilution interval added to the ore composite in the up hole direction (0).	Yes	0	0,+	Undefined
DILINT	Dilution splitting interval to be used when diluting narrow ore with adjacent waste (0).	Yes	0	0,+	Undefined