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Mincom-MineScape Reserves

2 Overview

The culmination of model preparation and construction and mine design is thecalculation of volumes, qualities and any other attributes for a set of mining blocks.

This section explores the components of the reserves subsystem, with commentarywhere required to advise on the most common values for most day-to-dayoperations.

2.1 Terminology

Interval---a conformable schema unit. In most cases, a coal seam---bounded bya top and bottom surface.

Quality name---the names defined as the quality definition specifications.

Quality code---the quality resource or waste identifier specified as part of aquality definition.

Resources---the ore/mineral being mined. In most cases, the coal

Sample table---Reserve output tables prior to accumulation

Sample---one row of a sample table representing a triangular prism within theblock being reserved.

Surface---any type of surface, grid, table, stratmodel and expression.

2.2 Preparation

Surfaces/IntervalsAll surfaces and intervals required as limiting, categorisation or reporting surfacesmust be created prior to reserving.

Stratmodel surfaces and intervals are generated automatically from the schemaprovided.

QualityQuality is any attribute to be associated with an interval, and accumulated using a

weight averaging technique.

A list of quality codes must be defined, a model assigning interpolators entered, andany defaults (global or by interval) specified.

Quality, is always calculated from surfaces residing in the surface database.The quality default is used if the quality surface is defined or returns a missing value,or if the thickness of composited intervals does not account for total thickness of theinterval.

Note: Ensure that the quality model is set as required before evaluating quality.

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Mincom-MinScape Reserves

2.3 Reserves Sample

Menu: RESERVES>SAMPLE

All reserving is based on the concept of a sample. A sample is defined as a

triangular prism. The polygonal sides always comprise vertical columns through thereserve block. The top and bottom 3D traingles lie on the top and bottom boundingsurfaces of the reserve block respectively. One sample is always defined by one rowin the table file, prior to any accumulation.

Reserves sample is generated from blocks that are defined as:

Solids. 3D blocks usually generated from Batter blocks. Identified by name.

Polygons. 2D polygons, poly3Ds or batter blocks. Identified by name(POLY3D/Batterblock in the Blocks database) or design file and number (element

ID). Wireframes. A set of enclosing 3D triangles. Identified by a design file and

search layers.

Triangles. Two sets of triangles defining top and bottom limits and area to bevolumed or a set of thickness triangles. Identified by design file and searchlayers.

2.4 Mining Reserves

Menu: RESERVES>MINING RESERVES

Mining reserves embellishes and modifies the input sample table to create a newsample table with columns for loss volume, dilution volume, raw recoverable mass,run-of-time (ROM) mass and product mass. If required, qualities can be adjusted toROM or product basis.

2.5 Reserves Accumulate

Menu: RESERVES>ACUMMULATE

Once the samples have been embellished and subdivided to generate the reservevalues required, they may be accumulated to the lowest level of control breaking bycombining all table rows with matching block name, polygon name, subset name,and reserve interval column values. This step must be performed before reports canbe produced.

2.6 Reserves Reformat

Menu: RESERVES>REFORMAT

The reserve sample tables may be reformatted into a variety of other formats forfurther processing:

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Block

Interval Reserve

Minestar

2.7 Reserve Reporting

Menu: RESERVES>REPORT

A set of default reports have been provided for the common reporting requirements.They are limited to one sub classification within each block. This subclassificationcan be comprised of more than one identification column in the reserves table.

1. Summary---generate a summary reserves report

2. Interval---generate an interval reserves report.

3. Burden---generate a burden reserves report.

4. Mining---generate a mining reserves report.

5. Ratio--- generate a vertical interval ratio reserves report.

6. Quality---- generate a quality reserves report.

7. User---defined--- generate a user-defined reserves report.

Accumulated Reserves sample tables are reported directly.

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3 Reserves from Solid

Menu: RESERVES-SAMPLE-SOLIDS

Solids can be used to generate samples to a table file. These samples are prismswith triangular top and bottom faces which can be accumulated to calculate volumes.Samples may also be generated graphically to a design file.

Schema Panel

Name. The name of the stratigraphic schema as defined in the specification.

Model type. The stratigraphic model typeeither TABLE or GRID.

Quality Model. The name of quality model specification.

Input Solids Panel

The input solids can be listed in a ASCII data file and/or may be entered by name.

Output Panel

Table file. The Table file must contain a valid name. The table file does not have toexist; if it does, it is deleted first. The table file stores the corner coordinates of thesamples, the top and bottom surface names and the values of any optional columns.

Solid column. A solid column name should be specified to hold the name of thesolid.

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Block area. An area may be calculated for the solid and stored in the table file.The area may be defined as that of the Top face, the Bottom face or a face lyingon a nominated surface. When a solid is generated using an offset operationthere are 2 faces lying on the surface corresponding to the offset operation.These 2 faces can be distinguished using the SURFACETOP and

SURFACEBOTTOM options. The SURFACETOP option identifies the facerepresenting the top of part of the solid. The SURFACEBOTTOM option identifiesthe face representing the bottom of the adjacent part of the solid.

Surface. Surface used to define the area.

Setup/Controls Panel

Optional Sample Column. A number of optional columns may be included in thesample table. These columns may be added for more information. It isrecommended that Volume, Area and Mass are included.

Note: The inclusion of optional columns increases the size of the table file and the amountof processing required.

- Volume. The sample total volume column.

- Plan area. The plan (horizontal) area.

- Top area. The slope area of the top of the sample.

- Bottom area. The slope area of the bottom of the sample.

- Top slope. The slope as a percentage gradient of the top of the sample.

- Bottom slope. The slope as a percentage gradient of the bottom of thesample.

- Top azimuth. The direction of slope (bearing) for the top of the sample.

- Bottom azimuth. The direction of slope (bearing) for the bottom of sample.

- Mass. Mass column.

- Parting. In-interval parting.

- True thickness. True thickness is the thickness perpendicular to the dip ofthe interval.

- Vert. Thickness. True vertical thickness is the thickness from the top to thebottom of the interval in the sample.

- Block area. Area of the solid face.

Sample Type and Sample Density. Samples can be generated using an AREAoption or a POINT option. With the AREA option, the value for the samplingdensity is the area per sample, hence the smaller the number, the more samplesgenerated. The units used for the area are stored in the project's environment.With the POINT option, the value for the sampling density represents the number

of samples per block, hence the larger the number, the more samples generated.

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Note: When using area per sample, ensure that it is defined in the current area unit. It iscritical that a suitable sample density is selected. Too few samples producesunreliable, inaccurate results, while too many samples increase execution timeunnecessarily. It is best to experiment with some indicate blocks to find a densitywhere variation in reserves volumes as a function of the number of samples

becomes small.

Accumulated. There is an option to perform accumulation by this module bysetting the Accumulate flag to Yes. Once the samples have been embellishedand subdivided to generate the reserve values required, they may beaccumulated to the lowest level of control breaking by combining all table rowswith matching block name, polygon name, subset name, and reserve intervalcolumn values. This step must be performed before reports can be produced.

Note: No further intersections or evaluations can be superimposed onto the sample table ifthe table is accumulated. This option should only be used if a quick one step processis intended. In most cases, this flag should be set to No. The accumulate menuoption can be used when all sample generation steps are complete.

Use Centeroid. Samples can be generated with either horizontal or sloping topand bottom faces when evaluating surfaces. In most cases, horizontal faces aresufficient, particularly when the sample density is adequate to represent the dataand the surfaces being evaluated have small dips (low angle slopes). For thisoption, the Use Centroid flag should be set to Yes. Samples are generated withthe top and bottom faces on the same elevation as their centroids. This providesa quick and efficient method of processing. The Non-Centroid option, which

ensures calculations are always performed at each corner of the sample prisms,increases the amount of processing and hence be much slower. This optionshould be used when design file output is important so that samples aregenerated with a smooth appearance at surfaces.

Note: When evaluating batters on solids (not a surface), each corner of the prism isevaluated over this part of the solid regardless of the centroid option used.

Design file output. If samples are to be drawn into a design file, the sample topsand bottoms are drawn as polygons.

Layer. Layer name for sample graphical output.

Append? Yes will append the graphics to existing layer, No will overwrite theexisting layer.

Display definition. The attributes of these polygons will be according to thedisplay definitions named int_ if the samples represent areserve interval roof or floor. The default display definition is used for all othersamples.

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Interval Tab-Divider

Reserve Interval Column. Interval column name must be specified to holdinterval name.

Topography surface. The Surface representing topography must be identified.

The name entered field must be a valid surface. This surface is used as theupper surface for overburden when using reserve intervals.

Burden column. column name must be specified to hold burden value.

Reserves interval. If samples are to be intersected with reserve intervals, a listof intervals should be supplied along with a selection expression for each. If thereserve intervals are not associated with a schema, they must be listed in theircorrect stratigraphic order, that is downhole order. For each reserve interval,there is a sample produced which is flagged RESOURCE in the burden column.There is always another sample produced which is for the burden. It is isinterburden, the burden column stores the name of the above-lying reserveinterval. If it is overburden, it has the name of the topographical surface,OVERBURDEN (if no topographical surface is specified) or the top surface of theoriginal sample (if it is below the topographical surface). If there is any part of thesample which is below the lower-most reserve interval it is placed in a samplewhich q has the burden column flagged as UNDERBURDEN and the reserveinterval column stores the name of the above-lying reserve interval.

Selection expression. The selection expression may be left blank (meaningTrue, hence all samples) or up to 80 characters of MXL entered. Thefile optioncan be used for larger expressions.

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Geology Tab-Divider

Geological Surfaces/Intervals. A list of geological surfaces and intervals maybe evaluated for each sample. The surfaces have their elevation stored whileintervals have their floor elevation, thickness and parting stored. Elevations and

thicknesses are evaluated at the samples' centroids. An option exists in thismodule to include qualities in the output sample table.

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Surfaceset Tab-Divider

Surface Set. Surface sets can be defined by supplying a name, upper surface,lower surface and a selection expression. A subset column name also must bedefined and the output table stores the name of the surface subset for eachsample. The new samples generated exclude volumes outside of the specified

surface subset limiting surfaces. However if a limiting surface, upper or lower, is'missing' then no volume will be excluded by this limit.

- Subset name. A 16 character maximum which define the subset name.

- Upper and Lower surface. The upper and lower surfaces can be anyMinescape surface, including surfaces defined in the specified schema.

- Selection expression. The selection expression may be left blank (meaningTrue, hence all samples) or up to 80 characters of MXL entered. The fileoption can be used for larger expressions.

Benches Tab-DividerBenches can be defined by supplying a bench definition name and selecting one ormore benches from this bench definition. A bench column name also must bedefined and the output table stores the bench name for each sample. The newsamples generated only include samples within the specified benches.

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Qualities Tab-Divider

Qualities require a set of Specs be set up. Each quality entered must have a qualitydefinition Spec defined. For each quality in the model, there is another Spec which

defines default values. These values are used when a quality surface cannot befound or the surface cannot be evaluated at a location.

Table columns for each quality per interval are included in the output table.Compositing is performed over each of the samples for each reserve interval and thevalues are written to columns named after the quality, i.e. .

Ensure that the quality model has been set before entering quality names.

Washability PanelBefore running reserves with washability, the user should be familiar with the format

of Minescape washability tables. This is described in detail in the How to useMinescape Qualitymanual. In summary, all data within a washability table must havethe same structure i.e. the same number and type of size fractions, the samenumber of RD fractions and same number and type of qualities. The data is stored ina special Minescape table with a suffix of .wsh. All washability functions onlyrecognise this type of table.

The input to wasability reserving is a list of intervals and the associated washabilityrables.

Include washability. Yes/No.

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Reserve intervals. A list of intervals for which washability is to be calculated.These must be a subset of the main reserving interval list.

Input wash table files. For each reserving interval, all of the washability data mustbe in same input table (and therefore of the same format). The input tables can

contain more than one interval (if the data is the same format). Output wash table files. Each reserving interval can be written to a different table,

or can be written to the same table if the washability table is of the same format.

Search radius. Typically only a small proportion of the drill holes have washabilitydata. The modelling search radius may therefore be insufficient for washabilitydata and a larger value may need to be provided. If the value is missing, themodelling seaarch radius is used.

3.1 Calculate Mining Reserve

Menu: RESERVES-MINING RESERVES

Mining reserves embellishes and modifies the input sample table to create a newsample table with columns for loss volume, dilution volume, raw recoverable mass,run-of-time (ROM) mass and product mass. If required, qualities can be adjusted toROM or product basis.

Models Panel


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Quality Model. The name of quality model specification.

Input Panel

Table file. The name of the input reserves sample table---may be any sampletable that has not been accumulated that includes values for sample mass,sample volume and true vertical thickness.

Ouput Panel

Table file. The table output file can be of the same name as the input table(hence updating the existing sample table) or a new output table name. Anyexisting table is overwritten.

Loss and Dilution Panel

Res. Intervals. A list of intervals which to be calculated in Mining Reserves.

Loss dan Dilution. Loss can be entered as a thickness or percentage so it mustbe flagged accordingly for each reserve intervals loss default. Similarly, Dilutionmay be given as a thickness or a percentage: the percentage may be added (apercentage of the in situ mass to add) or total (a percentage of the ROM mass). Ifa dilution surface name is supplied, the dilution value is evaluated from thissurface. If a value cannot be resolved from a dilution surface, the interval defaultis used.

Controls Panel Quality Basis to Output. If the basis field for the output qualities is Insitu or is

the same as the input basis, the values for the qualities are not recalculated. Ifthe required, quality basis is ROM orProduct and the input basis is Insitu, thequalities are corrected to the basis required

ROM moisture value dan Type. Target ROM moisture value and type of valueAddpercent or Totalpercent.

Product moisture value dan Type. Target Product moisture value and type ofvalue Addpercent or Totalpercent.

3.2 Accumulating Reserve

Menu: RESERVES>ACUMMULATE

Once the samples have been embellished and subdivided to generate the reservevalues required, they may be accumulated to the lowest level of control breaking bycombining all table rows with matching block name, polygon name, subset name,and reserve interval column values. This step must be performed before reports canbe produced.

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3.3 Reserve Reformat

The reserve sample tables may be reformatted into a variety of other formats forfurther processing:

Block

Interval Reserve

Minestar

3.3.1 Reformat Block

Menu: RESERVES>REFORMAT>BLOCK

These screens are used to select which reserve sample table fields are to bereformatted into a Minestar block record format.

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Schema Panel



Input Panel

Reserve table. The name of the input reserves sample table. May be any sampletable that has been accumulated.

Selection expression. Selection expression may be used to limit theaccumulated samples reported.

Output Panel

Table file. The block record table name. Any existing table is overwritten.

Naming Components PanelA list of identifiers to be used in the process of constructing names. The namesconstructed for each record are stored in nomenclature columns of the output table.Identifiers are used to construct the names to be stored in the nomenclaturecolumns. Where this identifier is repeated, this component of the name is appendedto existing components for that particular name.

The following is an example of the use of component identifier, type and value toconstruct output names:

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Identifier Type Value

RES_BLOCK CONSTANT P

RES_BLOCK BLOCKNAME 23456789

RES_SUBSET SUBSET 123

Reporting, Slopes and Other Tab-DividerThese screens are used to select which reserve sample table fields are to bereformatted into a Minestar block record format.

3.4 Reserve Reporting

Menu: RESERVES>REPORT

A set of default reports have been provided for the common reporting requirements.

They are limited to one sub classification within each block. This sub classificationcan be comprised of more than one identification column in the reserves table.

1. Summary---generate a summary reserves report

2. Interval---generate an interval reserves report.

3. Burden---generate a burden reserves report.

4. Mining---generate a mining reserves report.

5. Ratio--- generate a vertical interval ratio reserves report.

6. Quality---- generate a quality reserves report.

7. User---defined--- generate a user-defined reserves report.

Bellow is example of Summary report option.

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Input Panel

Table file. The name of the input reserves sample table---may be any sampletable that has been accumulated. Reformatted tables cannot be used.

Selection expression. Selection expression may be used to limit theaccumulated samples reported.

Output Panel

Report file. The output report file names, and header description. Any existingreport file is overwritten..

Report description. A description up to maximum 32 characters.

Naming Components PanelThis is only required if surface sets, polygon classification etc. have been used.

Leave blank for simple block by block reserves.

The names constructed for each record are stored in nomenclature columns of theoutput table. Identifiers are used to construct the names to be stored in thenomenclature columns. Where this identifier is repeated, this component of the nameis appended to existing components for that particular name.

The following is an example of the use of component identifier, type and value toconstruct output names:

Identifier Type ValueRES_BLOCK CONSTANT P

RES_BLOCK BLOCKNAME 23456789

RES_SUBSET SUBSET 123

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