Once the mine map is completed using the techniques described in the previous section, quantities of mined mineral and waste rock may be computed, with industry standard reports.
(1) Configuring the Section Information
Configuring the section information involves assigning each strata a
name and a density,
and specifying the look of the section for when it is placed in the
drawing. This information is
stored in a user-specified file and is referenced for locating sections
in the drawing and for
quantity calculations. If you reconfigure an existing section file,
sections placed in the drawing using
the previous section file become invalid and must be replaced. The
strata in a section can be configured as either individual or
composite. With the
individual configuration, each strata has its own name and density.
With composites, each strata is still
named separately but they also are divided into groups that have a
group name and density. The
principle advantage to composites is that it allows you to
enter and list out each strata height and then combine
the strata into their corresponding composite
category when generating tonnage quantities. First, let's configure
an individual section.
Select Configure Section Info in the Works dropdown.
Enter Coal Section Configuration
file name <C:\Carlson>:
SECTION1 Or the name of your choice.
Mine Name: Round Mountain
Enter Abbreviated Strata Name/<ENTER> to
End: C This name is drawn next to the corresponding
height when a section is located in the drawing.
Enter The Full Strata Name <C>:
Coal This name is used in quantity reports.
Enter Abbreviated Strata Name/<ENTER> to
End: B
Enter The Full Strata Name <C>:
Bone
Enter Abbreviated Strata Name/<ENTER> to
End: R
Enter The Full Strata Name <C>:
Rock
Enter Abbreviated Strata Name/<ENTER> to
End: press Enter
Enter Individual densities or Composite densities (I/C) <I>: press Enter
Average wt. of C (Coal) [lbs/ft^3]: 80
Average wt. of B (Bone) [lbs/ft^3]: 150
Average wt. of R (Rock) [lbs/ft^3]: 150
Circle the Coal Section (y/<n>)? Y This
specifies whether a circle is drawn around the
section when it is placed in the drawing.
Plot the Numeric Value Only
(y/<n>)? press Enter
Text Size <6.0>: press Enter
Now let's make a composite section. Select Configure Section Info in the Works dropdown.
Enter Coal Section Configuration
file name <C:\Carlson\MINE.SC>:
SECTION2 Or the name of your choice.
Mine Name: Round Mountain
Enter Abbreviated Strata Name/<ENTER> to
End: TC
Enter The Full Strata Name <C>:
Top Coal
Enter Abbreviated Strata Name/<ENTER> to
End: TR
Enter The Full Strata Name <C>:
Top Rock
Enter Abbreviated Strata Name/<ENTER> to
End: BC
Enter The Full Strata Name <C>:
Bottom Coal
Enter Abbreviated Strata Name/<ENTER> to
End: BR
Enter The Full Strata Name <C>:
Bottom Rock
Enter Abbreviated Strata Name/<ENTER> to
End: press Enter
Enter Individual densities or Composite densities (I/C) <I>:
C Define the Composite categories.
Enter Composite Category/<Enter> to END:
Coal
Average wt. of COAL [lbs/ft^3]: 80
Enter Composite Category/<Enter> to END:
Rock
Average wt. of ROCK [lbs/ft^3]: 150
Enter Composite Category/<Enter> to END: press Enter Assign the strata to a Composite category.
Enter Composite Category for Top Coal TC (COAL ROCK ):
coal
Enter Composite Category for Top Rock TR (COAL ROCK ):
rock
Enter Composite Category for Bottom Coal BC (COAL ROCK
): coal
Enter Composite Category for Bottom Rock TC (COAL ROCK
): rock
Circle the Coal Section (y/<n>)? press Enter
Plot the Numeric Value Only
(y/<n>)? press Enter
Text Size <6.0>: press Enter
The following figure shows how this section will appear in the drawing.
(2) Locating Sections
To locate section information measured from the mine, select
Place Coal Sections from the Works dropdown. Select the desired section
configuration file such as SECTION2 which you defined in the
previous section.
Pick sample point for coal section: pick a point on the map. This is the point where the
measurements came from.
Pick Start Point: pick another
point. This is where the text will be plotted. The text may be
placed anywhere you like because the program gets the section
measurements from the small circle at
the sample point and not from the text.
Pick Alignment Point: pick a point to align the text
Now enter your measurements.
How many inches of Top Coal TC: 30
How many inches of Top Rock TR: 5
How many inches of Bottom Coal BC: 25
How many inches of Bottom Rock BR: 4
Enter Another Section (Y/N) <Y>: press Enter
Enter the other section as shown in the next figure.
Placing a section |
(3) Compute tonnages
by average or modeled grid methods
There are three routines for calculating tonnages:
Quantities by Average Method, Quantities by Grid Method and Quantities
by Centerline. These methods require section sample points, and pillars
and a perimeter
defined as closed polylines in the PILLARS and PERIM layers
respectively. As its name suggests,
the average method uses the average values from sample section points
to compute its quantities.
The grid method actually models the values of the sample points over
the mined area which results
in more accurate tonnages. For now, let's use the average method
because it is much faster
and requires fewer sample points.
Select Quantities by Average Method in the Works dropdown. Select the file that defines the section sample points.
Beginning date of takeup [format
mm-dd-yy]
<-->: Enter Date in the format MM-DD-YY.
Ending date of takeup [format mm-dd-yy-] <-->: Enter
Date in the format MM-DD-YY. These dates are needed for mine reports.
Ownership/description: Jones This name is used for the report.
Which type of selection?
(<Standard>/Cuts) press Enter
Select objects: select the pillars, perimeter, and sample
points
Pick location to draw results or Enter for
none: pick a point above the mine as shown
Pick Alignment Point: pick a point to align the text.
Another Area (Y/N) <Y>: N
Quantities by Average Method |
Prepare Printer & press P when
ready or S for Screen
only. s (A detailed report should come to the screen.)
Update coal tonnage files (<Y>/N)?
Y This option updates data files for tonnage reports.
Enter a mine name: mine
Enter a panel name: press Enter for none
Enter the estimated coal reserves for mine mine:
300000
(4) Draw and compute volumes for pillar cuts on retreat
One of the final steps in underground mining is cutting into the
pillars on the "retreat". The
results of these cuts can be quickly drawn on the mine map using the
Pillar Cut routine in the
Works dropdown. The procedure is simply to pick a cut pattern and then
place the pattern inside the
pillar to be cut. That's it. Depending on the selected method, this
routine will either redraw the
pillar's polyline with the cuts removed, or it will create new
perimeter polylines inside the pillar in the
cut out spaces. The pillars must be closed polylines in the PILLARS
layer. The rotation of the
placed pattern will follow the current snap. If the cut pattern you
need is not already in the table, you
can define your own by first drawing a polyline of your pattern and
then selecting the user-defined
box in the Pillar Cut symbol table.
After redrawing the cut pillars with Pillar Cut, Quantities by Average Method or Quantities by Grid Method can be used to compute the quantities of the cuts. If the Cut option of Pillar Cut was used, then you will get the total quantities from the area between the pillars plus the pillar cuts. To get the quantities of only the pillar cuts, use the Perim option of Pillar Cut. This will create perimeter polylines inside the pillars. Then use Quantities by Average Method and select all these perimeter polylines. Let's practice pillar cuts.
Locating a pillar cut pattern |
Select Pillar Cut from the Works dropdown.
Choose the Cut 14 symbol or the symbol of your choice.
Enter
the azimuth for the cuts <0.0>: 10.0
Cut the pillar or create new
perimeter? (<Cut>/Perim) Perim
Hatch the new perimeter polylines?
(Y/<N>) press Enter
Select mine pillars Polylines
in the PILLARS layer.
Select objects: select all the
pillars
Pick a point for the symbol: pick a point as shown in the figure above
Pick a point for the symbol:
pick a point in the other pillars
Pick a point for the symbol:
press Enter to exit
Now let's get the quantity mined from the pillar cuts.
Select Quantities by Average Method in the Mining Works dropdown. Choose Section2 or the file that defines the section sample points.
Beginning
date of takeup [format mm-dd-yy] <-->: Enter the date in
the format MM-DD-YY
Ending date of takeup [format
mm-dd-yy] <-->: Enter the date in the format MM-DD-YY
Ownership/description: Jones
Which type of selection?
(<Standard>/Cuts) Cuts The Cuts selection type filters
out everything except perimeter polylines and sample points. This
allows you to select by windowing the area of the pillar cuts. Be sure
not to include the main, outside perimeter.
Select objects: select the
perimeter polylines and sample points
Pick location to draw results or Enter
for none: pick a point above the mine
Pick Alignment Point: pick a
point
Another Area (Y/N) <Y>: N
Prepare Printer & press P when
ready or S for Screen only. S
Update coal tonnage files
(Y<>/N)? Y
Enter a mine name: mine
Enter a panel name: press
Enter for none
This creates the following plot.
Pillar cut quantities
|