Options
Insitu Strip Ratios
The stripping ratio is defined as the volume of waste material divided by the tonnage of product material. The calculated ratio is placed in a selected block model variable; therefore each block will have a unique ratio value.
Cumulative
Cumulative ratios assume that all material above the horizon of interest is still in place. To obtain a cumulative stripping ratio for a single product block:
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- Calculate the total tonnage of product: The total tonnage of all product blocks above a product block of interest is summed with the tonnage of the product block of interest.
- Calculate the total volume of waste: The total volume of waste blocks above a given block in the horizon of interest is calculated.
- Cumulative stripping ratios = (total volume of waste)/(total tonnage of product).
Incremental
An Incremental stripping ratio assumes that all overlying material, except the burden directly above the horizon of interest, has been removed. An incremental ratio is the volume of a waste block divided by the tonnage of a product block of interest.
One or both of these methods can be selected. For each ratio, select the existing block model variable from the drop down list. If an existing variable does not exist in the model, default variables will be created.
Selected block model variables need to be float or double type.
Density
Global density factor
Enter a constant value for the density of the product. This value will be used when a density is not defined for a block. A sensible value for this constant will depend on the measurement system used. For a metric system, this is typically around 1.4.
Density Variable
Select the name of existing variable in the input HARP model which contains the density of each block. The density variable can be populated during HARP model construction or subsequently calculated using a Block model calculation script.
For details see related help topic(s):
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- Block : Manipulation : Edit Script
- Vulcan Core : Core Appendixes : Operator/Functions
- Vulcan Core : Core Appendixes : Script File Format
- Block : Manipulation : Execute Script
Volume units
Select whether thickness, volume and horizon relative level are measured in Cubic Metres or to use feet for thickness and cubic yards for volume, thus an adjustment factor of 1/27 or ~0.037 is used if Convert cubic feet to cubic yards is selected.
User Defined Strip Ratios
The stripping ratio is defined as the volume of waste material divided by the tonnage of product material. The calculated ratio is placed in a selected block model variable; therefore each block will have a unique ratio value.
The Product and Waste options need to be populated with precalculated block model variables that contain the tonnes of product and the volume of waste. The stripping ratio is then calculated based on the Waste divided by the Product.
Cumulative
Cumulative ratios assume that all material above the horizon of interest is still in place. To obtain a cumulative stripping ratio for a single product block:
-
- Calculate the total tonnage of product: The total tonnage of all product blocks above a product block of interest is summed with the tonnage of the product block of interest.
- Calculate the total volume of waste: The total volume of waste blocks above a given block in the horizon of interest is calculated.
- Cumulative stripping ratios = (total volume of waste)/(total tonnage of product).
Incremental
An Incremental stripping ratio assumes that all overlying material, except the burden directly above the horizon of interest, has been removed. An incremental ratio is the volume of a waste block divided by the tonnage of a product block of interest.
One or both of these methods can be selected. For each ratio, select the existing block model variable from the drop down list. If an existing variable does not exist in the model, default variables will be created.
Selected block model variables need to be float or double type.
Lowest Minable Surface
Select this check box to define the parameters of the lowest mineable surface.
Related topics
