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Geological Modelling | Lithology

The lithology modeling feature is used to generate the distance function points and grid model points (RBF) surrounding the boreholes by using the selected lithology or lithologies to be modeled. In this window, borehole, grid and trend criteria should be determined.

FeatureDescription
Borehole Criteria
Borehole GroupIf we have different groups for boreholes, we can separate the information and run the RBF (Radial Basis Function) for the determined group. That operation will allow users to create different solid models for different groups.
Data Type

This option includes lithology or the seam definition. If the attribute value (Calorie, Fe, Cr, etc.) exists in some specific lithology, by using this feature we’ll create the potential geological model underground. In another way, it will also be a grade model for us. For this project, we select CR(Chrome) lithology and proceed.

Lithology/SeamModeling can be performed by using the selected lithology or seam. If more than one lithology or seam is selected, the selected lithologies or seams are combined and considered as a single lithology or seam.
Minimum Ore Thickness

If there are lithologies shorter than a specified value, those lithologies won’t be taken into account while we’re creating the solid model. The software will not create the distance function points around that lithologies and later RBF points won’t be created for those lithologies.

Minumum Waste ThicknessIf there are lithologies shorter than the specified value in between the selected lithology, the software will consider that thin lithology as a selected lithology. 
BetaIt has an effect on the limits of the model to be produced. When the B value increases, the model expands and when the value decreases, the model shrinks. The button near that option calculates the average distance between boreholes. That value will have an effect on the RBF points. Different value entries will be required for the different projects.
C

It is an uncertainty range that will increase or decrease the points between boreholes. The c value is between 0 and 1. When the C value is closer to 0, uncertainty decreases, when it’s closer to 1, uncertainty increases.

Grid Points
GridAdds a grid that shows the borehole limits to the 3D screen.
X,Y,Z RangeThat value defines the distance between the points to be produced. That points will be created inside the grid limits. In another way, we’ll turn the grid object into a point cloud. These points will be used when we run the RBF later on.
Extra Distance X,Y,Z(Direction)That value will extend the grid limits for the selected direction
Select Grid Boundary

The limit can be defined for the grid. That feature allows grid points to be produced only in a limited area.

Trend
Function SelectionLinear or Multiquadric method selections are made. When the global trend is to be used, the linear method is chosen, and when the local trend is to be used, the multiquadric method is chosen.
Global TrendIf there is a unidirectional dip at the lithological levels to be modeled, the global trend is used. With the help of the slider that can be changed manually or dynamically and the same azimuth, rake and dip can be defined as the level to be modeled.
Local TrendIf different angles are observed in different regions at the lithological levels to be modeled, a local trend is used. When the local trend is selected, the upper and lower surfaces of the lithology to be modeled are produced, and the elevation points following the surface are produced at the specified X, and Y intervals on this surface. These points can be produced within the selected limits, or if there is a border outside the model, they can be extended to the limit.

The academic article for the calculation of the distance function points is in this link...

Borehole Criteria; It is used to generate distance function points on boreholes. With this feature, besides the contact points representing the lithology start and end locations, (minus)  negative values represent the lithologies, and (plus) positive values that represent non-lithological levels are also produced.

Grid Criteria; It creates a three-dimensional point cloud surrounding the boreholes within the specified X, Y, Z range, width and boundary.

Trend; It is used to model using global and local trends. If there is a one-way slope, the global trend is used, and if there is a different slope in different directions or zones, the local trend is used.

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