Sometimes you need to map a Block Model field that isn't coded in the original Block Model. For example, Ore and Waste definitions can be more complex and multiple grades and types inputs are required. In this case, to define different properties use Custom Variable functionality implemented through the Script Editor.
Scripting language is C#.
Inline formula vs Custom Variable
To define different properties you can write an inline formula using “IF” statement, such as If N(“Fe”) is greater than 60 return “hg” otherwise if N(“Fe”) is greater than 58 return “mg” otherwise if N(“Fe”) is greater than 57,5 return “lg1” otherwise if N(“Fe”) is greater than 56 return “lg2” otherwise if N(“Fe”) is greater than 50 return “minw” otherwise call it “waste”.
But such linear formulas can be too long and confusing. Therefore, if there are multiple properties and parcel types that need to be separated, it is recommended to use Custom Variables.
Custom variables allow us to write complex logic in a readable and reusable way, which can then be mixed with other inline formulas in the block model mappings.
Creating Custom Variable
Go to Setup > Block Model > Edit > Reservable Model Generator.
Click Custom Variables to open the Script Editor.
Clear all text from the Script Editor.
Replace it with one of the sample codes listed below.
In the list of available variables on the right you will see a new variable CustomT("Parcel") in bold, map it to the Parcel field.
Custom Variables Examples
Dry Tonnes
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class DryTonnes : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
double density = context.N("DENSITY");
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
return (density > 0 ? density * volume : 0);
}
}
Grade bins
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60) return "hg";
else if(fe > 58) return "mg";
else if(fe > 57.5) return "lg1";
else if(fe > 56) return "lg2";
else if(fe > 50) return "minw";
else return "w";
}
}
Multiple Grade Bins
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
double al = context.N("al");
string geology = context.T("geology");
string fe_bin;
if(fe > 60)
{
fe_bin = "60";
}
else if(fe > 55)
{
fe = Math.Floor(fe);
fe_bin = fe.ToString("#,##0");
}
else
{
fe_bin = "50";
}
string al_bin;
if(al < 3)
{
al_bin = "3";
}
else if(al < 6)
{
al = Math.Ceiling(al);
al_bin = al.ToString("#,##0");
}
else
{
al_bin = "9";
}
string geoClass = "1";
if(geology.Equals("detrital", StringComparison.OrdinalIgnoreCase))
{
geoClass = "2";
}
return fe_bin + "_" + al_bin + "_" + geoClass;
}
}
Ore Ratio
Rapid Reserver block model fields cannot report Stripping Ratio, because Stripping Ratio is not a sum or weight average type field. Instead, we can report ore ratio, which is the weight average of ore tonnes over total tonnes.
To do this we can set up a weight-averaged field called OreRatio as a child of "dryTonnes" or "wetTonnes" (whichever you want to report). This field will report a "1" for ore and a "0" for waste. The weight average of the 1s and 0s across a blast becomes the ore ratio.
Ore Ratio code
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class OreRatio : IDoubleCustomVariable
{
List<string> ores = new List<string>(){ "hg", "mg", "lg" }; //all lower case
public double GetNumber(CustomVariablesContext context)
{
string matType = context.T("mattype").ToLower(); //material type field from original block model
bool isOre = ores.Any(ore => matType.StartsWith(ore));
if(isOre) return 1;
else return 0;
}
}
Multiple Custom Variables
To create multiple custom variables, a class implementing the IDoubleCustomVariable or ITextCustomVariable interface needs to be created for each variable. These classes need to be listed under one another in the Custom Variables Script Editor, as shown in the examples below.
Multiple Custom Variables
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60) return "hg";
else if(fe > 58) return "mg";
else if(fe > 57.5) return "lg1";
else if(fe > 56) return "lg2";
else if(fe > 50) return "minw";
else return "w";
}
}
public class DryTonnes : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
double density = context.N("DENSITY");
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
return (density > 0 ? density * volume : 0);
}
}
Multiple variables with shared logic
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
//block model 1 has a "parcel1" variable
public class Parcel1 : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
string parcel = context.T("mtype"); //block model 1 field
return ParcelResolver.Parcel(parcel);
}
}
//block model 2 has a "parcel2" variable
public class Parcel2 : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
string parcel = context.T("ioretype"); // block model 2 field
return ParcelResolver.Parcel(parcel);
}
}
//parcel logic is wrapped up in the static ParcelResolver class
public static class ParcelResolver
{
private static List<string> _oreList = new List<string>
{
"hg", "hg1", "bl1", "mg", "lg", "lg1", "lg2", "mw"
};
public static string Parcel(string parcel)
{
if(_oreList.Contains(parcel.ToLower())) return "ore";
else return "waste";
}
}
Access Custom Variable from another Custom Variable
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using Alastri.Scripting;
using Alastri.BlockModel.Engine.CustomVariables;
public class Parcel : ITextCustomVariable
{
public string GetText(CustomVariablesContext context)
{
double fe = context.N("fe");
if(fe > 60)
return "hg";
else if(fe > 58)
return "mg";
else if(fe > 57.5)
return "lg1";
else if(fe > 56)
return "lg2";
else if(fe > 50)
return "minw";
else
return "w";
}
}
public class Recovery : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
Parcel parcel = new Parcel(); //Create an instance of the Parcel object
string p = parcel.GetText(context); //Call the GetText() method, store the result in variable 'p'
double volume = context.N("XINC")*context.N("YINC")*context.N("ZINC");
if(p == "hglp" )
return volume * 1.20;
else if(p == "hg")
return volume * 1.20;
else if(p == "mg")
return volume * 1.20;
else if(p == "lg1")
return volume * 1.20;
else if(p == "lg2")
return volume * 0.85;
else
return 0;
}
}
Access Custom Variable values from another Custom Variable
// Reading Factors from one variable into a second variable
// Update the ROM Recon Factors below
public class reconFactorVariable_1
{
double fe_F = 1.0;
double al_F = 1.0;
public double GetReconValue(CustomVariablesContext context, string code)
{
if (code.Equals("fe_F",StringComparison.OrdinalIgnoreCase))
return fe_F;
if (code.Equals("al_F",StringComparison.OrdinalIgnoreCase))
return al_F;
return 1;
}
}
public class fe_R_Variable_2 : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
var rf = new reconFactorVariable_1();
double grade = context.N("i_fe");
grade = grade * rf.GetReconValue(context,"fe_F");
return grade;
}
}
public class al_R_Variable_2 : IDoubleCustomVariable
{
public double GetNumber(CustomVariablesContext context)
{
var rf = new reconFactorVariable_1();
double grade = context.N("i_al");
grade = grade * rf.GetReconValue(context,"al_F");
return grade;
}
}
Variable validation and Error list resolution
Check if the statement is correct by pressing the Compile button at the top left corner of the Script Editor.
If you did a mistake, the Compile Error window will pop up, showing row and column of an error with a short description of its type.
Read the error message description and correct the lines specified.
If there are no errors during compilation, the custom variables should be listed in the Variables panel.
When the Errors panel is blank, and all relevant fields are mapped, press Generate to build the Reserve Model.
