For each strata in the drillholes, this command can calculate the volume, tonnage, and average attribute values within a specified area. The possible attributes depend on the configuration set in Define Drillhole. For example, attributes might be moisture, sulfur, BTU, etc.
The area for gathering quantities defaults to the limits of the selected surface entities and drillholes. To control the calculation area, multiple closed polylines for areas to include and/or exclude can be selected. Also, in the first selection of drillholes, any selected polylines in the PILLARS layer will automatically be made into exclusion areas and polylines in the PERIM layer will be made into inclusion areas. This is useful for getting quantities from drillholes among pillars and perimeters.
This command is similar to the Strata Quantities in Series
command. The difference is that this command does not process the
strata in sequence from top to bottom. Also this command does not
model the ground surface. Instead Selected Strata Quantities allows
you to select the strata to process from the list of available
strata. The advantage is that when there are many strata, you don't
have to cycle through all the top strata to get down to a specific
strata. Since the ground surface is not calculated, the
disadvantage of this command is that the outcrop for the selected
strata is not automatically calculated. The volume for the selected
strata is calculated using the strata thickness and the calculation
area. To limit the volume calculations to be inside the outcrop,
draw the outcrop as a closed polyline which can then be used as an
inclusion perimeter.
Another advantage of this command verses Strata Quantities in Series is that composite quantities can be calculated. Composite quantities allow you to select multiple strata and add their thickness together for the volume report. Also the weighted average of the attributes is calculated.
Select drillholes, channel
samples and strata polylines.
Select objects:
Reading drillhole 19
Finding splits ...
Finding pinch out ...
Calculating seam stacking ...
Select the Inclusion perimeter polylines or ENTER for none.
Select objects:
Select the Exclusion perimeter polylines or ENTER for none.
Select objects:
Choose modeling method [<Triangulation>/Inverse
dist/Kriging/Polynomial/LeastSq/ABOS]? I
Use inverse distance to which power
[First/<Second>/Third/Other]?
Use elliptical inverse distance [Yes/<No>]?
Pre-processing grid cells ...
Ignore zero attributes [<Yes>/No]?
Create composite quantities [Yes/<No>]?
Calculating grid by inverse distances 33880...
Processing cells ...
Enter strata C1_KEY density in lbs/ft^3 <80.000>:
C1_KEY Volume: 104804035.8 C.F., 3881631.0 C.Y., Avg Thickness:
1.25
C1_KEY Area: 83767500.0 S.F., 1923.0372 Acres
C1_KEY Tons: 4192161.4 at Density: 80.00
Calculate qualities from strata C1_KEY values
[<Yes>/No]? Y
Press ENTER to continue.
Calculating grid by inverse distances 33880...
Processing cells ...
Enter strata C2_KEY density in lbs/ft^3 <80.000>:
C2_KEY Volume: 159623387.6 C.F., 5911977.3 C.Y., Avg Thickness:
1.91
C2_KEY Area: 83767500.0 S.F., 1923.0372 Acres
C2_KEY Tons: 6384935.5 at Density: 80.00
Calculate qualities from strata C2_KEY values
[<Yes>/No]? Y
Pulldown Menu Location: StrataCalc
Keyboard Command: chquan2