Massflow SLC Example

Problem Statement

Note

To view this projects in MassFlow, use the menu command Help ► Examples…. The data files used is shown at the end of this example. All data and input files are found in the project directory.

This example demonstrates how to implement a SubLevel Caving method within MassFlow. The example is fairly simple, using a set of drawpoint, but it illustrates the method of extraction.

Building the Model

Drawpoints

The designed dimensions for the rings and DFZ of each drawpoint are shown in Table 1.

Table 1: Drawpoints designed geometry

BellName	slc%1
DDWidth	4.5
DDHeight	4.2
BellHeight	0
SideAngle	0
EndAngle	0
DFZDepth	1.8
DFZWidth	10
DFZHeight	45.8
SideHoleAngle	60
CrossCutSpacing	17
SublevelSpacing	25
Burden	2.5
RetreatAz	180

Once the drawpoints are imported, they can be plotted, as shown below.

Figure 1: Drawpoint spatial distribution.

Once the draw schedule has been imported, the drawing start. You can find the spacing and thicklayer conditions at the end of the example page.

Figure 2: Block model ore/waste distribution.

Results

We compute the extraction over 500 days. The IMZ after 50 days is shown in the figure below.

Figure 3: IMZ geometry after 50 days of extraction.

We obtain the following sequence of extraction every 100 days.

Figure 4: Markers movement after 100 days of extraction.

Figure 5: Markers movement after 200 days of extraction.

Figure 6: Markers movement after 300 days of extraction.

Figure 7: Markers movement after 400 days of extraction.

Figure 8: Markers movement after 500 days of extraction.

Data Files

Main.dat

model new
;massflow mine-block import-txt "mineBlocks.txt"
;massflow drawpoint import-txt "drawpoints.txt"
;massflow drawpoint import-drawbell-txt "drawbells.txt"
;massflow drawpoint import-drawperiod-txt "drawperiod.txt"
massflow mine-block import "mineBlocks.csv"
massflow drawpoint import "drawpoints.csv"
massflow drawpoint import-drawbell "drawbells.csv"
massflow drawpoint import-drawperiod "drawperiod.csv"


massflow initialize layer-thickness 0.5 percent-empty 0.75 save-days 100 compute-days 500
massflow marker initialize spacing 0.2

massflow record name 'Sublevel Caving' 

model update-interval 100

massflow clean
massflow compute
;massflow drawpoint extraction-report

model save 'example_SLC_final'