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]? 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 in Advanced Mining
Keyboard Command: chquan2
File Names: \lsp\strata_q.lsp, \lsp\makegrid.arx, \lsp\makegrid.dcl